SU778973A1 - Apparatus for welding non-rotary butts of tubes - Google Patents

Description

(54) DEVICE FOR WELDING PULSE BENDED PIPES

The invention relates to the field of welding, in particular to devices for welding fixed pipe joints, and can be applied in shipbuilding, mechanical engineering and other industries.

A known machine for welding with a non-consumable electrode with filing of the filler wire and the mouthpiece turning mechanism relative to the axis of the electrode 1.

The main disadvantage of this device is that the wire, when it is fed from different angles to the electrode, due to twisting and backlash in gearing and other movable joints, when the feed unit is rotated relative to the welding torch, leaves the electrode. This reduces the reliability of the device and does not allow to improve the quality of the weld.

A device for welding of non-rotary joints of pipes with a non-melting electrode with a filing wire at an acute angle to the electrode is known. This method of welding is more productive than when the wire is fed tangentially to the product 2.

However, this device does not allow to tune the wire relative to the electrode, in addition, there is no copier in it, which reduces the reliability of the device.

- It is also known a device for welding fixed pipe joints.

The closest to this invention in its technical essence is a device for welding fixed butt joints, comprising an installation mechanism with a housing fixed on it, on which a welding torch, a mouthpiece, a copier mechanism with a roller, and a movement mechanism 3 are mounted.

This device welds the non-rotating annular joints into the corner, and welding is performed from the outside with a melting electrode. In this device, the mouthpieces with electrode wire and the torch through which the protective gas or flux is supplied are

20 different planes, and this makes it difficult to carry out high-quality welding with non-consumable electrode end-ring connections. The design is complex, the backup device does not fulfill its function — to repeat the irregularity of the pipe with the electrode along the generatrix passing under the electrode, which reduces copying accuracy, and the rollers far from the axis reduce the reliability of the device. These deficiencies lead to a deterioration in the quality of welding.

The purpose of the invention is to increase the quality of welding of the end connections of small diameter pipes by increasing the copying accuracy.

For this, the copying mechanism is designed as a plug with a frame and a sleeve, and the copying roller is made with a toroidal working surface and is coaxially mounted on a sleeve, at the end of which a mound of pins are fixed, while the plug is rigidly fixed to the housing, perpendicular to the axis of rotation of the roller and lying in the plane of its maximum cross section, and the mouthpieces and welding torch are located in the same plane passing through the generator of the welded pipes.

FIG. 1 shows the device, the overall appearance; in fig. 2 - copy mechanism with a mouthpiece movement mechanism; FIG. 3 shows a section in FIG. 2

On the mounting mechanism 1, a plate 2 is fixed, kinematically connected with the electric motor 3. The housing 4 is fixed by means of the hinge 5 to the plate 2 and is pressed out from it by the spring 6. The shank 7, which is fixed to the hinge 5 and carries the welding torch 8 with electrode 9, is attached for supplying current and gas the special cable 10. The burner 8 is kinematically connected with the movement mechanism 11, and the mouthpiece 12 is connected with the movement mechanism 14 by means of a copy mechanism 13. The copier mechanism 13 consists of a fork 15 rigidly connected to the body 4, the pivots 16 of the frame 17, and the sleeve. 18 and copy roller. 19 with a toroidal working surface 20, and the transfer mechanism 14 consists of a screw 21, a handle 22 and a spring 23. A sleeve 24 is attached to the sleeve 18 on one side, and a mouthpiece 12 on the other hand 12. In the track 24, sleeve 18 and the mouthpiece 12 wire 25.

The device works as follows

The movement mechanism 11 is adjusted by means of the bar 7 and the torch 8 electrode 9 to the joint. The mechanism 14 to move through the copying mechanism 13 and the mouthpieces 12 adjust the wire 25 to s.1k. The setting mechanism 1 secures the device to the product. Spring 6

778973

presses the body 4 through the roller 19 with a tore working surface 20 to the product. The reversal axis 16 of the mouthpiece 12 passes through the center of the radius of the working surface 20, which ensures, when setting the wire 25 to the joint, the position of the position relative to the electrode 9. The motor 3 rotates the housing 4 with the burner 8, the copier mechanism 13 with through it, the filler wire 25. When the copying mechanism 13 is rotated, copying takes place along the inner wall of the pipe by means of the working surface 20 of the roller 19. The device allows welding from inside of small diameters killing with the filler wire by passing the wire through the copy roller, and making the roller from the torus working surface with the axis of rotation passing through the center of the radius of the working surface will improve copying accuracy, which will reduce scrap to ISVo-

Claims (3)

1. USSR author's certificate number 190711, cl. 23 K 9/16, 1966. 2. USSR author's certificate number 284225, cl. 23 K 9/16, 1969. 3. USSR author's certificate No. 523778, cl. 23 K 31/06, 1973.