CN116652349A - Electrodes for resistance spot welding of thin-walled metal structures - Google Patents

Abstract

The invention discloses an electrode for resistance spot welding with a metal thin-wall structure, which comprises: an electrode body, a welding plane for contacting a workpiece to be welded is formed at one end, an air outlet is opened on the welding plane, and an air outlet is formed in the electrode body to communicate with the air outlet. The gas channel; the conductive gasket, which is in the shape of a belt, includes a first end and a second end, covering the welding plane, and an exhaust hole connected with the air outlet is formed on the conductive gasket; the clamping mechanism is used for Clamping and fixing the first end and the second end of the conductive gasket on the electrode body. By setting the gas channel on the electrode head and the air hole on the electrode head, during the welding process, the shielding gas can be sprayed onto the conductive gasket to form a protective airflow layer, which weakens the oxidation of the conductive gasket and reduces the generation of additional heat , At the same time, it can take away excess heat, realize cooling, reduce the risk of oxidation and fusing of conductive pads during the welding process, and ensure the strength and stability of solder joints.

Description

Electrodes for resistance spot welding of thin-walled metal structures

technical field

The invention relates to the field of metal resistance spot welding, in particular to an electrode for metal honeycomb structure spot welding.

Background technique

Spot welding technology has been widely used in many fields such as electronic devices, aerospace, automobiles, etc. Among them, the electrodes used in resistance spot welding, energy storage spot welding and other spot welding techniques that use resistance heat as a heat source are generally divided into upper electrodes and lower electrodes. Two parts, the upper and lower electrodes respectively contact the surface of the workpiece to be welded. Due to the differences in the material, shape, size and other physical and chemical properties of the workpiece to be welded, the materials, shapes, sizes and other functions of the corresponding upper and lower electrodes are different. . The metal honeycomb seal structure is one of the common structures in the field of aero-engine manufacturing. The structure is composed of a metal honeycomb and a shell, ring or plate carrying the metal honeycomb. The quality of this structure is crucial to aero-engines, gas turbines and other products. The structure is generally manufactured using a high-temperature vacuum brazing process, and the metal honeycomb needs to be spot-welded on the shell, ring or plate before brazing. The metal honeycomb is a high-temperature alloy material with a wall thickness of only 0.05-0.08mm, which is difficult to weld, so special electrodes need to be designed.

In the existing technology, the solution of installing copper sheets on the electrodes is adopted. The copper sheets can buffer the pressure of the electrodes on the honeycomb structure and prevent the electrodes from crushing the thinner honeycombs during the welding process. Due to the high melting point of superalloys, During the welding process, the surface of the metal honeycomb, solder joints, electrodes, and copper pads on the electrodes are prone to oxidation. When the copper sheet is oxidized, the resistance increases, and when the next current passes through, the copper sheet will generate more The heat will further accumulate oxidation, and even cause the copper sheet to melt due to overheating. At the same time, the increase in resistance will also cause current loss, which will deteriorate the quality of the solder joint between the metal honeycomb structure and the workpiece, resulting in instability or reduced strength.

Contents of the invention

The invention provides an electrode for resistance spot welding of metal thin-walled structures to solve the technical problems of oxidation reaction occurring in the spot welding process of metal thin-walled structures, which further leads to melting of copper sheets and low strength of solder joints.

The invention provides an electrode for resistance spot welding with a metal thin-wall structure, which includes an electrode body, a welding plane formed at one end of the motor body, an air outlet hole is opened on the welding plane, and a gas channel communicating with the air outlet hole is formed in the electrode body; a conductive pad Sheet, in the shape of a strip, including a first end and a second end, covering the welding plane, and an exhaust hole communicating with the air outlet is formed on the conductive pad; the clamping mechanism is used to place the conductive pad The first terminal and the second terminal are clipped and fixed on the electrode body.

By adopting the above scheme, firstly, the conductive gasket covers the welding plane, and the conductive gasket and the parts to be welded are in surface contact, which is not easy to generate partial discharge, and avoids the point contact between the electrode and the parts to be welded to cause partial discharge. Discharge, causing burning or burning of thin-walled structures;

Secondly, by providing a gas channel on the electrode head and an air outlet on the electrode head, during the welding process, the shielding gas can enter from the gas channel and be sprayed out from the air outlet to form a protective gas flow layer on the conductive gasket. The conductive gasket is isolated from the air, and by reducing the contact between the conductive gasket and oxygen, the oxidation of the conductive gasket is weakened and the generation of additional heat is reduced;

At the same time, the protective air flow passes through the electrode body, the conductive gasket and the thin-walled structure to be welded, which can take away excess heat and achieve cooling. This way, while controlling the temperature, it also weakens the oxidation probability of the conductive gasket; The combination of temperature and temperature can reduce the risk of oxidation and fusing of the conductive gasket during the welding process, so that the strength and stability of the solder joints are guaranteed.

Further, the electrode body is formed with a transition chamfer on the edge of the welding plane, and a side blow hole communicating with the gas channel is opened on the transition chamfer, and the gas outlet direction of the side blow hole is at an angle with the welding plane. is an acute angle.

By adopting the above scheme, the shielding gas can be applied around the solder joint through the side blowing hole, which weakens the oxidation reaction process of the thin-walled structure around the solder joint, and can protect the workpiece with the thin-walled structure; at the same time, the side blowing hole and the The air outlets are distributed in different positions of the electrode body. The contact area between the protective gas and the electrode body is larger, which can have a better heat dissipation effect on the electrode body, avoid excessive temperature of the electrode head, and form a guided airflow to guide the air outlet. The ejected protective gas flows around the surface of the conductive gasket.

Further, the electrode body includes an electrode head, the welding plane and the air outlet are located on the electrode head; a connection seat is detachably connected to the electrode head, and a mounting hole communicating with the air outlet is formed in the connection seat. hole, the clamping mechanism is set on the connecting seat; one end of the connecting rod is detachably installed in the mounting hole, the other end is used to connect with the protective gas source, and a through hole is arranged in the connecting rod along the length direction. The hole communicates with the installation hole to form the gas channel; the middle section of the conductive gasket is wrapped on the surface of the electrode head, and the first end and the second end of the conductive gasket are respectively fixed on the surface of the connecting seat through a clamping mechanism.

By adopting the above scheme, the electrode head is detachably connected to the connecting seat, and when the electrode head is damaged, the electrode head can be replaced separately, with low cost. At the same time, different types of electrode heads can be flexibly configured for different types and shapes of workpieces to be welded , with a wide range of applications; the connecting seat is used as a connection structure connecting the electrode head and the connecting rod to achieve a stable connection between the two. At the same time, the connecting seat is also used as the carrier of the clamping mechanism, which can maintain stability under the action of the clamping force of the clamping mechanism. , is not easy to deform, can avoid the risk of gas passage blockage caused by the deformation of the electrode body caused by repeated clamping by the clamping mechanism, and has good stability; the middle part of the conductive gasket wraps the electrode head, and the two ends are clamped and fixed on the connecting seat, which is This installation method can not only ensure the stable installation of the conductive gasket, but also enable the conductive gasket to play an auxiliary role in fixing the electrode head, so as to prevent the electrode head from detaching from the connection seat during the welding process.

Further, the seat body reinforcing sleeve is embedded in the installation hole, and the rod body reinforcing sleeve is embedded in the through hole, and the hardness of the rod body reinforcing sleeve and the seat body reinforcing sleeve is greater than that of the connecting seat and the connecting rod. hardness, the rod body reinforcing sleeve, the seat body reinforcing sleeve and the air outlet are connected in sequence.

By adopting the above scheme, for the good conductivity of the electrode body, the connecting seat and the connecting rod need to be made of copper, and the hardness and melting point of copper are low, and it is easy to deform under the action of high temperature during the welding process. The seat body strengthening sleeve and the rod body strengthening sleeve can enhance the overall stability, and form an inner support structure to restrain the deformation of the connecting seat and the connecting rod.

Further, a pressure stabilizing chamber communicating with the air outlet is provided in the electrode head, and the seat reinforcement sleeve protrudes from the connecting seat and extends into the pressure stabilizing chamber.

By adopting the above scheme, after the protective gas enters from the gas channel, it first enters the pressure stabilizing chamber, and then enters the air outlet from the pressure stabilizing chamber. The shielding airflow can be kept stable, enhancing the inhibition of oxidation of conductive pads and soldering surfaces.

Further, the clamping mechanism includes a first clamping plate for clamping the first end of the conductive gasket, one end of the first clamping plate is hinged to the connecting seat, and the other end of the first clamping plate is One end is a free end; the second clamping plate is used to clamp the second end of the conductive gasket, one end of the second clamping plate is hinged to the connecting seat, and the other end of the second clamping plate is a free end, The second clamping plate is parallel to the hinged axis of the connecting seat and the hinged axis of the first clamping plate and the connecting seat; the lock is arranged on the free ends of the first clamping plate and the second clamping plate; by rotating the first clamping plate The holding plate and the second holding plate, so that the free ends of the first holding plate and the second holding plate are close to or far away from each other, and when the two free ends meet, the first holding plate and the second holding plate are locked by the locking piece. clamping plate.

By adopting the above scheme, one end of the first clamping plate and the second clamping plate are hinged to the connecting seat, and when the locking member and the conductive gasket are unlocked, the first clamping plate and the second clamping plate will not be separated from the connecting seat , no need to disassemble and assemble repeatedly, and it is more convenient to use; the free ends of the first clamping plate and the second clamping plate share a locking piece, when replacing the conductive sheet, only one unlocking and locking action is required to replace the conductive gasket fewer steps.

Further, the locking member includes an elastic body fixed on the first clamping plate, and the expansion and contraction direction of the elastic body is parallel to the axis of rotation of the first clamping plate; a locking block is connected with the elastic body, and the locking block is away from the One side of the elastic body is a working surface, and the working surface is a smooth convex spherical surface; the locking groove is located on the second clamping plate and is used to cooperate with the locking block; by making the first clamping plate and the second clamping The plates rotate and meet, so that the working surface of the locking block is pressed by the surface of the second clamping plate, thereby compressing the elastic body, and when the locking block moves to the position facing the locking groove, the locking block works under the tension of the elastic body The surface enters the locking groove, thereby realizing the locking of the first clamping plate and the second clamping plate.

By adopting the above scheme, during the locking process, the first clamping plate and the second clamping plate are rotated, when the first clamping plate and the second clamping plate meet, the spherical working surface contacts the surface of the second clamping plate, A component force parallel to the rotation is generated, thereby compressing the elastic member, and the working surface continues to slide on the surface of the second clamping plate. When it slides to the position where the locking block is facing the locking groove, the locking block will be under tension of the elastic body. Under the action, it enters the locking groove to realize locking; when it needs to be unlocked, reversely rotate the first clamping plate and the second clamping plate, and the working surface will be squeezed by the edge of the locking groove to generate axial component force to make the elastic The body is compressed again, and when the locking block breaks away from the locking groove, the unlocking is completed; the entire locking and unlocking process does not need to manually control the locking member, only need to rotate the first clamping plate and the second clamping plate to complete the locking and unlocking, locking And the unlocking speed is fast and the operation is convenient.

Further, the first clamping plate includes a first clamping portion for pressing the clamping gasket and a first locking portion for locking, and an insertion groove is formed on the first locking portion , the insertion groove is formed with a mounting hole for accommodating the elastic body; the second clamping plate includes a second clamping part for pressing the clamping gasket and a second lock for locking The tightening part, the second locking part is formed with an inserting protrusion for inserting and mating with the inserting groove, and the locking groove is located on the inserting protrusion.

By adopting the above scheme, the first clamping part and the second clamping part are used to clamp the conductive gasket, the first locking part and the second locking part are used to cooperate with the locking part for locking, and the two functional areas Without interfering with each other, it can guarantee the stability of clamping and the convenience of unlocking; both the convex surface of the insertion and the inner wall of the groove of the insertion are in contact with the conductive gasket, which can increase the friction by increasing the contact area, so that the conductive The clamping of the gasket is more stable.

Further, there are at least two sets of locking pieces, the elastic bodies of each set of locking pieces are installed on different sides of the inner wall of the insertion groove, and the locking grooves of each set of locking pieces are opened on different sides of the insertion protrusion. .

By adopting the above solution, multiple sets of locking pieces can be locked from different directions, and the locking stability is better, and multiple sets of locking pieces can be unlocked and locked during the process of rotating the first clamping plate and the second clamping plate , the operation is more convenient.

Further, the two sides of the electrode body are respectively provided with fastening ribs, and the first end and the second end of the conductive gasket are respectively covered on the fastening ribs; the first clamping part Fastening grooves corresponding to the fastening ribs are provided on the second clamping part and the second clamping part. When the first clamping plate and the second clamping plate are locked, the fastening ribs hold the conductive gasket Pushing into the fastening groove, the fastening rib and the inner wall of the fastening groove jointly clamp the conductive gasket.

By adopting the above scheme, the setting of the fastening protrusions and fastening grooves can increase the contact area between the clamping mechanism and the electrode body and the conductive pad, thereby increasing the friction force and making the clamping of the conductive pad more stable .

The present invention has the following beneficial effects:

1. In the present invention, by providing a gas channel on the electrode head and an air outlet on the electrode head, during the welding process, the protective gas can be sprayed onto the conductive gasket to form a protective gas flow layer, which weakens the oxidation of the conductive gasket. Reduce the generation of extra heat. At the same time, the protective air flow passes through the electrode body, conductive gasket and thin-walled structure to be welded, which can take away excess heat; under the joint action of oxygen isolation and temperature control, it can reduce the electrical conductivity during welding. The risk of oxidation and fusing of gaskets ensures the strength and stability of solder joints;

2. By setting the side blow holes, the shielding gas can be applied to the surrounding solder joints through the side blow holes, which weakens the oxidation reaction process of the thin-walled structure around the solder joints, and can protect the thin-walled structure workpieces;

3. While the clamping mechanism of the present invention can ensure stable clamping of the conductive gasket, the entire locking and unlocking process does not require manual control of the locking member, and the locking can be completed by simply rotating the first clamping plate and the second clamping plate And unlocking, fast locking and unlocking, easy to replace the conductive gasket quickly.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. Hereinafter, the present invention will be described in further detail with reference to the drawings.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the assembly structure schematic diagram of a kind of metal thin-wall structure resistance spot welding electrode of preferred embodiment of the present invention;

Fig. 2 is the sectional structure schematic diagram of a kind of metal thin-wall structure resistance spot welding electrode of preferred embodiment of the present invention;

Fig. 3 is the explosion schematic diagram of a kind of metal thin-wall structure resistance spot welding electrode of preferred embodiment of the present invention;

FIG. 4 is a schematic diagram showing the internal structure in a transparent manner in FIG. 3 .

illustration:

1. Conductive gasket; 2. Electrode body; 21. Electrode head; 211. Welding plane; 212. Air outlet; 213. Side blowing hole; ; 23, connecting rod; 231, rod body strengthening sleeve; 3, clamping mechanism; 31, the first clamping plate; 311, the first clamping part; 312, the first locking part; 313, the insertion groove; 32. The second clamping plate; 321. The second clamping part; 322. The second locking part; 323. Insertion protrusion; 33. Locking piece; 331. Elastic body; 332. Locking groove; 34. Cylindrical pin ; 35, fastening convex corrugated; 36, fastening groove.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered below.

As shown in Figure 1, this embodiment provides an electrode for resistance spot welding of thin-walled metal structures, which is used in the process of resistance spot welding of thin-walled metal structures, specifically, it can be used for metal honeycomb seals in the field of aero-engine manufacturing. During the welding process of the rigid structure, the structure is generally produced by high-temperature vacuum brazing process, and the metal honeycomb spot welding needs to be positioned on the shell, ring or plate before brazing. The electrode for resistance spot welding of metal thin-walled structure includes an electrode body 2, a conductive pad 1, and a clamping mechanism 3 for clamping and fixing the conductive pad 1 on the electrode body 2. During welding, the conductive pad 1 and the The parts are in direct contact, and the current is conducted to the parts to be welded through the electrode body 2 and the conductive pad 1.

As shown in FIG. 1 , the electrode body 2 includes an electrode head 21 , a connecting seat 22 and a connecting rod 23 connected in sequence. During welding, the electrode clamping handle on the welding device clamps the connecting rod 23 to support the electrode body 2 . A welding plane 211 is formed on the side of the electrode tip 21 far away from the connection seat 22, and the conductive pad 1 covers the welding plane 211. During welding, the conductive pad 1 at the welding plane 211 contacts the welding surface of the piece to be welded. Compared with the traditional spot welding electrode, the contact area between the electrode and the workpiece to be welded in this solution is larger, so that the current is evenly distributed on the surface to be welded of the metal thin-walled structure, and the thin-walled structure is prevented from being burned or burned by partial discharge.

In this embodiment, the conductive gasket 1 is strip-shaped, including a first end and a second end, and the conductive gasket 1 is made of copper, because it has good electrical conductivity and thermal conductivity, which helps to ensure the welding quality At the same time, the hardness of copper is low, which can avoid crushing or scratching the metal thin-walled structure during the welding process. In other specific implementation manners, gold, silver, or metal single substance or alloy materials that can achieve the same effect can also be used. Optionally, the conductive pad 1 is a braided copper wire, because it is densely covered with tiny pores, and while having good air permeability, the current can be evenly distributed on the welding surface. In other specific embodiments, the conductive pad The sheet 1 can also adopt the method of opening fine and small holes on the metal sheet to achieve a similar effect.

As shown in Figure 2, the width of the electrode tip 21 is reduced along the direction of the rounded rectangular groove, forming an arc-shaped convex platform with an isosceles trapezoidal cross section. The convex platform surface is a welding plane 211, and an air outlet 212 is provided on the welding plane 211. A mounting hole communicating with the air outlet 212 is formed in the connecting base 22 , and a through hole is formed in the connecting rod 23 along the length direction, and the through hole communicates with the mounting hole to form a gas channel. During the welding process, the gas channel is connected to the shielding gas source, the shielding gas can enter from the gas channel, and spray out from the air outlet 212 onto the conductive gasket 1 to form a protective airflow layer, which isolates the conductive gasket 1 from the air , by reducing the contact between the conductive gasket 1 and oxygen, thereby weakening the oxidation of the conductive gasket 1 and reducing the generation of additional heat, while protecting the airflow through the electrode body 2, the conductive gasket 1 and the thin-walled structure to be welded, which can take away excess heat to achieve cooling, so that the oxidation of the conductive gasket 1 is also weakened after the temperature is controlled; the risk of oxidation and fusing of the conductive gasket 1 during the welding process can be reduced under the joint action of the two means of isolating oxygen and temperature control, The strength and stability of the solder joints are guaranteed.

As shown in Figures 1 and 2, a transition chamfer is formed on both sides of the welding plane 211, and a side blow hole 213 communicating with the gas passage is provided on the transition chamfer, and the gas outlet direction of the side blow hole 213 is an acute angle with the welding plane 211. , the shielding gas can act on the surroundings of the solder joints through the side blowing holes 213, which weakens the oxidation reaction process of the metal thin-walled structures around the solder joints, and can protect the metal thin-walled structures.

As shown in Figure 2, the electrode head 21 is provided with a pressure stabilizing chamber 214 connected with the gas channel, the gas outlet hole 212 and the side blow hole 213 are both connected with the stabilizing chamber 214, after the protective gas enters from the gas channel, it first enters into the stabilizing chamber. The pressure chamber 214 then enters the air outlet 212 from the pressure stabilization chamber 214, and the pressure fluctuation of the protective gas can be stabilized in the pressure stabilization chamber 214.

As shown in Figure 2, the seat body reinforcement sleeve 221 is embedded in the mounting hole; the rod body reinforcement sleeve 231 is embedded in the through hole; The hardness of the rod body reinforcement sleeve 231, the seat body reinforcement sleeve 221 and the air outlet 212 are connected in sequence. For the good conductivity of the electrode body 2, the connection seat 22 and the connection rod 23 need to be made of copper, and the hardness and melting point of copper are both It is relatively low, and it is easy to deform under the action of high temperature in the welding process. By setting the seat body reinforcement sleeve 221 and the rod body reinforcement sleeve 231 with higher hardness, the stability of the electrode body 2 can be enhanced without affecting the conduction of the shielding gas. Pass, optionally, the rod body reinforcing sleeve 231 and the seat body reinforcing sleeve 221 are made of stainless steel.

As shown in Figure 3, the electrode head 21 is connected to the connection seat 22 through a pin, so that the electrode head 21 and the connection seat 22 can be disassembled, so that when the electrode head 21 is damaged, the electrode head 21 can be replaced separately, and at the same time, the electrode head 21 can be replaced by Different types and shapes of workpieces to be welded can be flexibly configured with different types of electrode heads 21 . The connecting rod 23 is detachably installed in the mounting hole. Optionally, the connection mode between the connecting rod 23 and the mounting seat is a threaded connection. The outer wall of the connecting rod 23 is provided with external threads, and the inner wall of the mounting hole is provided with internal threads that cooperate with it. . One end of the seat strengthening sleeve 221 is brazed and fixed in the connecting seat 22, and the other end extends into the pressure stabilizing chamber 214 to enhance the airtightness.

As shown in Figure 3, the clamping mechanism 3 includes a first clamping plate 31, a second clamping plate 32 and a locking member 33, the first clamping plate 31 is used to clamp the first end of the conductive pad 1, the second Two clamping plates 32 are used to clamp the second end of the conductive gasket 1, one side of the first clamping plate 31 is hinged with the connecting seat 22, and the other end is a free end, and one side of the second clamping plate 32 is connected to the connecting seat 22 is hinged, the other end is a free end, the axis of the second clamping plate 32 hinged with the connecting seat 22 is parallel to the axis of the first clamping plate 31 hinged with the connecting seat 22, and the locking member 33 is arranged on the first clamping plate 31 and the connecting seat 22. The free end of the second clamping plate 32 is used for locking the first clamping plate 31 and the second clamping plate 32 . The free ends of the first clamping plate 31 and the second clamping plate 32 share a locking member, which facilitates quick replacement of the conductive gasket 1 .

As shown in Figure 3, the optional mounting base is provided with a threaded hole, the first clamping plate 31 and the second clamping plate 32 are provided with pin holes, and the two pin holes are coaxially arranged, and a cylinder is pierced together. The pin 34 and the cylindrical pin 34 are installed in the threaded hole of the mounting base, and the two ends of the threaded hole are respectively threaded with a set screw to fix the cylindrical pin 34.

As shown in FIG. 3 , the first clamping plate 31 includes a first clamping portion 311 for pressing the conductive gasket 1 and a first locking portion 312 for locking. The first locking portion 312 is formed with a plug connected to the groove 313, the second clamping plate 32 includes a second clamping part 321 for pressing the conductive gasket 1 and a second locking part 322 for locking, and the second locking part 322 is formed with a The insertion groove 313 is plugged into the mated insertion protrusion 323. When the first clamping plate 31 and the second clamping plate 32 are rotated to lock, the insertion protrusion 323 first cooperates with the insertion groove 313 to play a role The role of preliminary positioning is to facilitate the locking of subsequent locking parts.

As shown in FIG. 3 , the locking member 33 includes an elastic body 331 , a locking block and a locking groove 332 . The inner wall of the insertion groove 313 is formed with a mounting hole, and the elastic body 331 is fixedly installed in the mounting hole. The telescopic direction of the elastic body 331 is parallel to the axis of rotation of the first clamping plate 31; the locking block is fixedly connected with the other solid body, and the locking block The side away from the elastic body 331 is the working surface, and the working surface is a smooth convex spherical surface. When the elastic body 331 is not subjected to external force, the working surface of the locking block protrudes out of the mounting hole; the locking groove 332 is located on the insertion protrusion 323 on, for mating with locking blocks. During the locking process, rotate the first clamping plate 31 and the second clamping plate 32, when the first clamping plate 31 and the second clamping plate meet, the spherical working surface contacts the surface of the first insertion protrusion 323, resulting in a Rotate the parallel component force, and then make the elastic member be compressed, and the working surface continues to slide on the surface of the insertion protrusion 323. When sliding to the position where the locking block is facing the locking groove 332, the locking block will be under the tension of the elastic body 331. Under the action, it enters into the locking groove 332 to realize locking; when it needs to be unlocked, the first clamping plate 31 and the second clamping plate 32 are reversely rotated, and the working surface is squeezed by the edge of the locking groove 332 to generate axial separation. force, the elastic body 331 is compressed again, and when the locking block breaks away from the locking groove 332, the unlocking is completed; the entire locking and unlocking process does not need to manually control the locking member 33, only need to rotate the first clamping plate 31 and the second clamping plate 32 can complete locking and unlocking, and the locking and unlocking speed is fast.

As shown in Figures 3 and 4, at least two sets of locking pieces 33 are provided, and the elastic bodies 331 of each set of locking pieces 33 are installed on different sides of the inner wall of the insertion groove 313, and the locking grooves 332 of each set of locking pieces 33 are opened in the insertion socket. On different sides of the protrusion 323, in this embodiment, two sets of locking pieces 33 are provided. The insertion protrusion 323 is formed with two positioning surfaces perpendicular to the axis of the cylindrical pin 34. The two positioning surfaces of the insertion protrusion 323 are respectively A locking groove 332 is provided, and two positioning surfaces perpendicular to the axis of the cylindrical pin 34 are also formed in the insertion groove 313. The two positioning surfaces of the insertion protrusion 323 are each provided with a mounting elastic member and a locking block. hole, two sets of locking pieces 33 respectively lock the upper and lower sides of the insertion protrusion 323, the locking is relatively stable, and multiple sets of locking pieces 33 can be unlocked in the process of rotating the first clamping plate 31 and the second clamping plate 32 and lock. Optionally, the locking member 33 can also be disposed on the surface of the insertion protrusion 323 parallel to the axis of the cylindrical pin 34 , that is, the end surface of the insertion protrusion 323 away from the end of the second clamping portion 321 in the figure.

As shown in FIG. 3 , fastening ribs 35 are respectively provided on both sides of the connecting seat 22 , and the first end and the second end of the conductive gasket 1 are respectively covered on the fastening ribs 35 ; the first clamping portion 311 and the second clamping portion 321 are provided with fastening grooves 36 corresponding to the fastening ribs 35. When the first clamping plate 31 and the second clamping plate 32 are locked, the fastening ribs 35 will connect the conductive gasket 1 is pushed into the fastening groove 36, so that the fastening rib 35 and the inner wall of the fastening groove 36 clamp the conductive gasket 1 together. The setting of the fastening rib 35 and the fastening groove 36 can increase the contact area between the clamping mechanism 3 and the electrode body 2 and the conductive gasket 1, thereby increasing the friction force and making the clamping of the conductive gasket 1 easier. Stablize.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. an electrode for resistance spot welding of metal thin-walled structure, is characterized in that, comprises: The electrode body (2) has a welding plane (211) formed at one end, and an air outlet (212) is opened on the welding plane (211), and a gas channel communicating with the air outlet (212) is formed in the electrode body (2); The conductive pad (1) is in the shape of a strip, including a first end and a second end, covering on the welding plane (211), and the conductive pad (1) is formed with a hole communicating with the air outlet (212). Vent pores; The clamping mechanism (3) is used for clamping and fixing the first end and the second end of the conductive gasket (1) on the electrode body (2). 2. a kind of metal thin-walled structure resistance spot welding electrode according to claim 1, is characterized in that, The electrode body (2) is formed with a transition chamfer on the edge of the welding plane (211), and a side blow hole (213) communicating with the gas channel is opened on the transition chamfer, and the side blow hole (213) The angle between the gas outlet direction and the welding plane (211) is an acute angle. 3. The electrode for resistance spot welding of a metal thin-walled structure according to claim 1, wherein the electrode body (2) comprises The electrode head (21), the welding plane (211) and the air outlet (212) are located on the electrode head (21); The connection seat (22) is detachably connected to the electrode head (21), and an installation hole communicating with the air outlet hole (212) is formed in the connection seat (22), and the clamping mechanism (3) is set On the connecting seat (22); Connecting rod (23), one end is detachably installed in the mounting hole, the other end is used to connect with the protective gas source, the connecting rod (23) is provided with a through hole along the length direction, and the through hole communicates with the mounting hole to form the said gas channel; The middle section of the conductive pad (1) is wrapped on the surface of the electrode head (21), and the first end and the second end of the conductive pad (1) are respectively fixed on the surface of the connecting seat (22) through the clamping mechanism (3). 4. a kind of metal thin-walled structure resistance spot welding electrode according to claim 3, is characterized in that, A base reinforcing sleeve (221) is embedded in the mounting hole; A rod strengthening sleeve (231) is embedded in the through hole; The hardness of the rod reinforcing sleeve (231) and the base reinforcing sleeve (221) are greater than the hardness of the connecting seat (22) and the connecting rod (23), the rod reinforcing sleeve (231), the seat reinforcing sleeve (221) communicates with air outlet (212) successively. 5. a kind of metal thin-walled structure resistance spot welding electrode according to claim 4, is characterized in that, The electrode head (21) is provided with a pressure stabilizing chamber (214) communicating with the air outlet (212), and the seat strengthening sleeve (221) protrudes from the connecting seat (22) and extends to In the pressure stabilizing chamber (214). 6. a kind of metal thin-walled structure resistance spot welding electrode according to claim 3 is characterized in that, described clamping mechanism (3) comprises, The first clamping plate (31), used to clamp the first end of the conductive gasket (1), one end of the first clamping plate (31) is hinged with the connection seat (22), and the first clamping plate ( 31) The other end is a free end; The second clamping plate (32) is used to clamp the second end of the conductive gasket (1), and one end of the second clamping plate (32) is hinged with the connection seat (22), and the second clamping plate ( 32) The other end is a free end, and the second clamping plate (32) is parallel to the hinged axis of the connecting seat (22) and the hinged axis of the first clamping plate (31) and the connecting seat (22); The locking piece (33) is arranged on the free ends of the first clamping plate (31) and the second clamping plate (32); By rotating the first clamping plate (31) and the second clamping plate (32), the free ends of the first clamping plate (31) and the second clamping plate (32) are approached or far away from each other, and between the two When the free ends converge, the first clamping plate (31) and the second clamping plate (32) are locked by the locking piece (33). 7. The electrode for resistance spot welding of a thin-walled metal structure according to claim 6, characterized in that, the locking member (33) comprises The elastic body (331) is fixed on the first clamping plate (31), and the stretching direction of the elastic body (331) is parallel to the axis of rotation of the first clamping plate (31); The locking block is connected with the elastic body (331), the side of the locking block away from the elastic body (331) is the working surface, and the working surface is a smooth convex spherical surface; The locking groove (332), located on the second clamping plate (32), is used to cooperate with the locking block; By rotating the first clamping plate (31) and the second clamping plate (32), the working surface of the locking block is pressed by the surface of the second clamping plate (32), thereby compressing the elastic body (331) , and when the locking block moves to the position facing the locking groove (332), the working surface of the locking block enters the locking groove (332) under the tension of the elastic body (331), thereby realizing the first clamping plate (31) and the second clamping plate (31) The locking of two clamping plates (32). 8. a kind of metal thin-walled structure resistance spot welding electrode according to claim 7, is characterized in that, The first clamping plate (31) includes a first clamping portion (311) for pressing the conductive gasket (1) and a first locking portion (312) for locking, the first locking An insertion groove (313) is formed on the part (312), and an installation hole for accommodating the elastic body (331) is formed in the insertion groove (313); The second clamping plate (32) includes a second clamping portion (321) for pressing the conductive gasket (1) and a second locking portion (322) for locking, the second locking An inserting protrusion (323) is formed on the part (322) for inserting and mating with the inserting groove (313), and the locking groove (332) is located on the inserting protrusion (323). 9. a kind of metal thin-walled structure resistance spot welding electrode according to claim 8, is characterized in that, The locking pieces (33) are provided with at least two groups, and the elastic body (331) of each group of locking pieces (33) is installed on different sides of the inner wall of the insertion groove (313), and the locking of each group of locking pieces (33) The slots (332) are opened on different sides of the insertion protrusion (323). 10. a kind of metal thin-walled structure resistance spot welding electrode according to claim 8, is characterized in that, The two sides of the electrode body (2) are respectively provided with fastening ribs (35), and the first end and the second end of the conductive gasket (1) are respectively covered on the fastening ribs (35). superior; Both the first clamping part (311) and the second clamping part (321) are provided with fastening grooves (36) corresponding to the fastening ribs (35), When the first clamping plate (31) and the second clamping plate (32) are locked, the fastening rib (35) pushes the conductive gasket (1) into the fastening groove ( 36), the fastening rib (35) and the inner wall of the fastening groove (36) clamp the conductive gasket (1) together.