A gas shielding device for laser welding

Abstract

The invention discloses a laser welding gas shielding device. The laser welding gas shielding device comprises a walking portion arranged along a welding gap, wherein the walking portion comprises a first walking vehicle and a second walking vehicle which are located on the two sides of the welding gap and can walk along the welding gap, and one end of the first walking vehicle and one end of thesecond walking vehicle are jointly provided with a wire feeding nozzle portion for feeding welding wires to the welding position in a supporting mode. The laser welding gas shielding device further comprises a lateral gas curtain portion and a longitudinal gas pipe portion, wherein the lateral gas curtain portion is movably arranged on the first walking vehicle and the second walking vehicle in asupporting mode and can blow gas to the welding gap from the two sides of the welding gap, and the longitudinal gas pipe portion is movably arranged at the other end of the first walking vehicle and the other end of the second walking vehicle in a supporting mode and can blow gas to the welding position in the vertical plane where the welding gap is located. According to the gas shielding device,gas can be blown to the welding position from the lateral direction and the longitudinal direction, therefore, the welding position and the positions in front of and behind the welding position can beshielded, and the welding effect of laser welding can be improved.

Description

technical field [0001] The invention relates to the field of laser welding, in particular to a laser welding gas protection device. Background technique [0002] In the manufacturing process of petrochemical, shipbuilding, aerospace and other major equipment, welding problems of thick-walled components are often encountered. However, modern industry and national defense equipment are gradually developing towards large-scale and high-parameters. The application of thick-walled welded structures is becoming more and more extensive, and the problems of thick-walled welding are becoming increasingly prominent. When using the traditional fusion welding method to weld thick-walled components, in order to fully penetrate the side walls of the groove to avoid the defects of unfused side walls, it is necessary to open an X-shaped groove or choose a J-shaped groove with a large groove angle. As the wall thickness of welded components increases, the cross-sectional area of ​​the groov...

AI Technical Summary

Problems solved by technology

At present, most of the existing designs of laser welding gas protection devices for thick plates with narrow gaps are modified side blowing gas pipes fixed on the laser welding head. Although most of the shielding gas can be sent into the narrow gap by modifying the side blowing pipes, The protection area is still small, and the gas protection device is fixed to the laser welding head, which limits the working range of the laser welding head to a certain extent

Images