GB2367519A

GB2367519A - Contact - impulse welding

Info

Publication number: GB2367519A
Application number: GB0024158A
Authority: GB
Inventors: Stanislav Brodski; Yevgeny Brodski
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-03
Filing date: 2000-10-03
Publication date: 2002-04-10
Anticipated expiration: 2020-10-03
Also published as: GB0024158D0; GB2367519B

Abstract

A battery of condensers 1 accumulates charge which is fed to a welding zone through welding wire 2. A device 4 advances a preset length of wire as the charge is fed to form a discrete weld seam length or patch weld. Alternatively a detail piece may be welded to another component by the device 4 advancing such detail piece as the charge is fed.

Description

Method of contact-impulse welding Introduction Proposed invention belongs to a class of methods of welding of metals and alloys.

It is known that in contact welding, where a battery of condensers is used as a source of discharge, and welding is conducted by contact joining the details together, between which a discharge occurs; and in the place of the discharge metal of both details fuses together forming a contact weld.

Impulse welding is also known where special generators of powerful impulses, characterised by parameters of impulse welding, are used. Due to high powers, impulses form a weld seam so quickly that impulse welding is conducted without any protection from the influence of oxygen of the air, because in impulse welding oxygen of the air has not got sufficient time to react with the metal.

In proposed method of contact-impulse welding, impulses with the parameters of impulse welding are formed with the help of a battery of condensers. But due to the fact that condensers are capable of replenishing their chargeduring a certain period of time, a possibility of using small power electricity sources in the proposed method arises. On account of this the weight of the entire welding equipment for contact-impulse welding does not exceed several kilograms. With the help of such an appliance it is possible to conduct significant welding works such as assembly of steel rafters and others even at home. Therefore contact-impulse welding is suitable for constructing assembly works in workshops, laboratories, in field and breakdown conditions. The proposed method can also be used in exact mechanics, jewellery works and for patch welding.

The nature of the method for contact-impulse welding allows to shift to welding by contact method with a simple transformation of a device for contact-impulse welding, which enriches capabilities of the method of contactimpulse welding.

The proposed method is schematically presented on Figure 1 and described in the description of the invention. Description of the invention Method of contact-impulse welding comprises a battery of condensers 1 with a rectifier, an automatic control of charging and discharging of the condensers, an electrode wire 2, a hose 3 through which an electrode wire passes to the device 4 for moving the electrode wire to the welding zone, a wire 5 which is being served onto a detail being welded in order to close the circuit when the discharge occurs. Manufacturing of a steel door with the help of contact-impulse welding is presented on Figure 1. Electricity to the system is supplied via wire 7.

Work of the method on contact-impulse welding Electrical charge from battery of the condensers 1 is being served via the electrode wire 2 and the hose 3 onto the device 4 for moving of the electrode wire into the zone of welding. Wire 5 is being fixed onto the details being welded for closing the circuit. After an operator puts the device on a place of future welding or patch welding resting it against a ceramic cup, he switches on the device 4 which at high speed moves the electrode wire 2 onto previously calculated length of the welding or patch welding zone-according to the instructions for use, depending on the power of the discharge, the diameter of the electrode wire and the speed at which it is being moved, where between the electrode wire 2 and the details being welded a discharge occurs in the process of which steel of the electrode 2 on its movement into the welding zone melts and builds up in the place of welding forming a short but high quality weld seam or a patch weld.

After this the operator moves the device 4 onto a new place and the cycle of works repeats itself with formation of new length of weld seam. Furthermore the whole cycle of works can be automated.

Claims

Claims Claim 1. Method of contact-impulse welding combining two known methods of welding-contact welding and impulse welding which is being conducted by building up charge in the battery of the condensers and a following impulse discharge into the zone of welding or patch welding, parameters of which correspond with impulses in impulse welding, excelling known methods in that with the object of simplifying welding equipment and reducing its price and weight, and in order to make it possible to conduct constructing assembly works in workshops, laboratories, in field and breakdown conditions, to use the method in exact mechanics and jewellery works and also when there is lack of powerful sources of electricity and lack of ordinary welding equipment, welding with the proposed method is conducted by moving-at high speed-a calculated length of electrode wire of small diameter in the instant of the discharge of the battery of the condensers into the zone of welding, according to the instructions for use, moreover the melted metal of the electrode, builds up in the zone of welding in the process of the discharge forming a small weld seam or a patch weld in the designed place, moreover a precise size of the weld seam can be chosen in accordance with the regime of work provided in the instruction-depending on the diameter of the electrode wire, the power of the discharge impulse, the speed at which the electrode wire is being moved and its length.
Claim 2. Method of contact-impulse welding, claimed in Claim 1 comprising a device for moving the electrode wire at high speed into the zone of welding in the process of the discharge of the battery of the condensers, excelling known methods in that with the object of carrying out contact-impulse welding in a chosen regime of works and i. e. obtaining a weld seam of the required size, for a given diameter of the electrode wire, according to the instructions for use, the method provides that a calculated speed of the movement of the electrode is set with the help of a regulator of the speed of movement of the electrode wire and adjusting the calculated capacity of the battery of the condensers by turning on or off a part of the battery-according to the data

given in the instruction. t Claim
3. Method of contact-impulse welding claimed in Claim 1 comprising device for moving the electrode wire at high speed into the zone of welding in the process of the discharge of the battery of the condensers, excelling known methods in that with the object of conducting works with contact-impulse welding in various regimes of work-from welding of steel details of significant thickness to jewellery works, the method provides that the length of the electrode wire being moved can be regulated by means of adjusting the distance of free wheeling of the electrode wire into the zone of welding by filling it with special washers or by removing them, with appropriate regulating of the speed at which the electrode is being moved, the power of the charge of the battery of the condensers-according to the data presented in the instruction-depending on the chosen diameter of the electrode wire, the material from which the electrode is made-steel, silver, gold, platinum etc, and the desirable size of the weld seam.
Claim 4. Method of contact-impulse welding claimed in Claim 1 comprising a device for moving the electrode wire at high speed Into the zone of welding in the process of the discharge of the battery of the condensers, excelling known methods in that with the object of preventing the electrode wire from sticking to the weld seam upon completion of the discharge and the movement of the calculated length of the electrode into the welding zone-according to the instruction-the method provides that the device for moving the electrode wire automatically retreats a small length of the electrode wire from the melted metal preventing it from sticking, and then the device for contact-impulse welding is moved onto a new place of welding or patch welding, and the cycle of works is repeated with formation of a new length of weld seam, moreover all the works claimed in Claims 1,2,

3 and 4 can be automated and programmed, and electromechanical, pneumatic, hydraulic, electromagnetic, magnetic-impulse methods and others can be used for moving the electrode wire into the zone of welding.
Claim 5. Method of contact-impulse welding claimed in Claim 1 comprising a device for moving the electrode wire at high speed into the zone of welding in the process of the discharge of the battery of the condensers, excelling known methods in that with the object of widening of the capabilities of the method of contact-impulse welding, the method provides that any construction of device for moving the electrode wire can be re-equipped into a device for moving small details into the zone of welding, moreover a discharge between the details will be formed followed by welding together of the details, i. e. the device for contact-impulse welding can be re-equipped into a device for contact welding.