SU1094710A1 - Internal centering mount for assembling and welding girth welds in atmosphere of shielding gas - Google Patents

Abstract

1. INTERNAL CENTER FOR ASSEMBLING AND WELDING THE RING OF SEAMS IN THE ENVIRONMENT OF PROTECTIVE GAS, containing expansion elements made from FIG. g outer annular groove and installed on the th t with the ability to interact with a conical unclamping mechanism, characterized in that, in order to reduce the flow of protective gas while ensuring high quality welding, it is equipped with sector plates installed in the outer annular grooves of expandable elements, in which Radial channels for supplying gas are made, while teeth with longer lengths than the total depth of the outer annular groove and radial channel are made at the ends of the sector plates. l gassing, and sector plates on the whole surfaces are arranged in a staggered radial Suitable gas inlet openings.

Description

2. A centralizer according to claim 1, characterized in that each expanding element is provided with a fitting for the supply of protective gas.

1094710

3. Centralizer on PP. 1 and 2, characterized in that the pie plates are made of a highly heat-conducting material.

The invention relates to the field of welding, namely, devices for assembling and welding ring welds by fusing in a protective gas environment, and can be used in the aviation, chemical industry and in mechanical engineering in the manufacture of welded structures.

A centralizer is known, comprising a pivot rod associated with a resilient element lj forming a seam;

A centralizer is known, which consists of separate forming elements mounted on the thrusts pivotally connected with rods located along the axis of the centralizer and swinging one relative to the other 2.

Also known is a centralizer whose control element is made in the form of a coil spring fixed at one end to the rod, and the other end free.

The disadvantages of these centralizers are the complexity of the design, as well as the fact that it is not possible to weld in shielding gas.

Closest to the invention by technical essence is a centralizer, containing expanding elements, made with an external annular groove mounted on a cable with the possibility of interaction with a conical unclamping mechanism. The centralizer is inserted inside the joined parts so that the annular groove, made on expansion elements, is located under their joint. During the movement of the rod, inside of which the pipe for the supply of protective gas is located, either a clamp or an extrusion of the parts being welded 4 occurs.

However, the presence of a large number of open holes and slots in the device gives a large number

protective gas emitted during welding. Moreover, there is no guarantee of sufficient penetration of the protective gas into the zone of formation of the weld,

and in this connection, high-quality welding.

The aim of the invention is to reduce the flow of protective gas while ensuring high quality welding.

To achieve this goal, an internal centralizer for assembling and welding ring welds in a protective gas medium, containing expanding elements,

 made with an outer annular groove and mounted on a tag with the possibility of interaction with a conical unclamping mechanism, equipped with sector plates installed in the outer annular grooves of the expandable elements in which radial channels for supplying gas are formed, while the ends of the sector plates have teeth with

 a length longer than the total depth of the outer annular groove and the radial channel for the supply of gas, and in the sector plates the radial gas supply holes are arranged in a checkerboard pattern.

In addition, each expansion element is provided with a fitting for the supply of protective gas.

 Moreover, the sector plates are made of high heat conducting material.

FIG. 1 shows a centralizer, a general view; FIG. 2 - the same section; in fig. 3 is a view A of FIG. 1} in FIG. 4 shows a section BB in FIG. 3

Internal centralizer contains the following elements.

Expanding elements 2 are located on step 1, each of which has a fitting 3 for supplying protective gas.

The radial channel 4, the outer stepped annular groove 5, the sealing ring 6. The tension and the expanding elements are in contact with each other by conical surfaces, which are drilled on the pull and expandable element. In the stepped annular groove 5, sector plates 7 of high thermal conductivity material (copper) are mounted, which are fixed in the expansion elements with pins to prevent them from falling out. These plates are necessary to remove heat from the weld zone.

Sector plate 7 has radial holes 8 arranged in a checkerboard pattern. These openings are intended for supplying protective gas to the weld forming zone. Along the edges of the sector plate are teeth 9, which intersect the step annular groove of the expanding element and radial channels 4 for supplying gas to reduce the flow of protective gas. An outer annular groove 10 is provided on the sector plate 7 for supplying protective gas directly to the weld formation zone. Razzhimnye

3 5

the elements 2 are fixed in the manipulator using a ring 11, having T-shaped protrusions (T-shaped depressions are made in the elements 2).

The device works as follows.

The centralizer is installed in the manipulator of the welding machine by means of a ring 11, having previously installed welded parts on it. To this end, the expanding elements are inserted into the welded parts in such a way that the location of the welding seam falls on the outer annular groove 10 of the lamellar sector 7. Using the pull 1, the elements 2 are unclamped until the welded parts are fully clamped. Through fittings 3, the radial channel 4, the groove 5, through the radial holes 8 of the sector plate 7 along the groove 10, the protective gas is fed into the forming area of the weld.

Due to the fact that the expansion elements are provided with sector plates, in which teeth are made that are included in the stepped annular groove of the expansion element, the flow of protective gas is significantly reduced.

Claims (3)

1. INTERNAL CENTER FOR ASSEMBLY AND WELDING OF RING SEAMS IN THE ENVIRONMENT OF PROTECTIVE GAS, containing expansion elements made with inlet holes · ± - tl • ..... 1 • g > -3 4 s ______ / e = = ^ = Hi an external annular groove and mounted on a thrust with the possibility of interacting with a conical expanding mechanism, characterized in that, in order to reduce the shielding gas consumption while ensuring high quality welding, it is equipped with sector plates installed in the outer annular grooves of the expandable elements, in which radial channels for supplying gas, while at the ends of sector plates teeth are made with a length exceeding the total depth of the outer annular groove and the radial channel for supply and ha, for, and in sector plates radial gasFig staggered along the entire surface are made. 1 2. The centralizer of π. 1, characterized in that each expandable element is equipped with a fitting for supplying a protective gas. 3. The centralizer for PP. 1 and 2, characterized in that the sector plates are made of highly heat-conducting material.