Gas protection device for back face of welding line

Abstract

The invention relates to a gas protection device for the back face of a welding line. The gas protection device for the back face of the welding line is used when gas protection automatic welding is carried out at a circumferential weld outer groove; the device adopts two symmetrically assembled semi-ring components to cover a circumferential weld inner wall groove; a second ring plate without a gas-guide hole and a third ring plate with a gas-guide hole are connected between inner side arc edges of two semi-ring plates of the same semi-ring component; a plurality of rib plates are also connected between the two semi-ring plates, and are uniformly distributed in a semicircle on which the semi-ring plates are located; and the inner side edges of the rib plates are connected with the outer side faces of the second ring plates and the third ring plates. Fixed blocks are connected to the two ends of the diameters of the semicircles on which the second ring plates or the third ring plates are located; each two adjacent fixed blocks are connected through a bolt, so that the two semi-ring components are connected; and between the semi-ring plates of the same semi-ring component, and in the range of the outer sides of the second ring plates or the third ring plates, protected gas is guided into through the gas-guide hole of each third ring plate, so that a favorable gas protection effect is achieved. The gas protection device for the back face of the welding line provided by the invention is simple in structure, and convenient and fast to assemble and disassemble.

Description

technical field [0001] The invention relates to a welding auxiliary device, in particular to a gas protection device for the back side of a weld. Background technique [0002] In the field of nuclear power or chemical containers, when the outer groove of the circular seam of parts is automatically welded with gas protection, the inner wall of the circular seam is generally protected by gas on the back. In general, the inner wall of the circular seam is sealed with tape or canvas, and then the inner wall of the circular seam is sealed. The gas conduit is placed in the small hole on the sealing material for gas protection. This method is relatively simple, but the sealing effect and gas protection effect are not good. Contents of the invention [0003] The invention provides a gas shielding device for the back of the weld seam, which can provide good gas shielding effect when welding the inner wall of the circular seam. [0004] In order to achieve the above object, the tec...

AI Technical Summary

Problems solved by technology

[0002] In the field of nuclear power or chemical containers, when the outer groove of the circular seam of parts is automatically welded with gas protection, the inner wall of the circular seam is generally protected by gas on the back. In general, the inner wall of the circular seam is sealed with tape or canvas, and then the inner wall of the circular seam is sealed. Put the gas conduit into the small hole on the sealing material for gas protection. This method is relatively simple but the sealing effect and gas protection effect are not good

Images