Laser-electric arc composite welding gas-shielded method for laser front-loading

Abstract

A laser-arc hybrid welding gas shielding method for laser front, which is characterized in that: in the laser-arc hybrid welding process, the laser front composite method is adopted, and the shielding gas circuit in the arc welding torch is used to protect the arc and At the same time, there is a front shielding gas path on the front side of the arc welding torch, and a rear shielding gas path on the rear side of the arc welding torch. The front shielding gas path is used to protect the laser and the base metal action area, and is connected The shielding gas path in the welding torch jointly protects the eutectic pool formed by the laser and the arc, and the rear shielding gas path is used to protect the formed weld seam. Since the present invention adopts a plurality of gas path shielding gases to effectively protect the laser action area, arc action area and weld seam respectively, the purpose of reducing or avoiding weld seam oxidation is achieved, and the present invention concentrates the shielding gas path on the arc welding torch , which is beneficial to the implementation of the composite welding process, reduces the probability of interference between the composite welding joint and the base metal, and has a simple implementation process, easy operation, and good use effect.

Description

technical field [0001] The invention relates to a welding protection method, in particular to a laser-arc composite welding gas protection method used for laser pre-positioning. Background technique [0002] Laser-arc hybrid welding technology combines the advantages of laser welding and arc welding, and has been widely used in industry. In the laser-arc hybrid welding process, due to the addition of the arc, the heat input increases, and the formed molten pool and weld width are also larger, and the temperature of the weld that has been formed by laser-arc hybrid welding is still high, especially It is the weld seam temperature near the molten pool. If it is not protected or the protective gas coverage is not enough for comprehensive protection, it is easy to expose the high-temperature weld seam to an unprotected environment, and the weld seam will oxidize and turn blue or even black; Because there is a certain distance between the laser and the arc, the protective gas bl...

AI Technical Summary

Problems solved by technology

In the laser-arc hybrid welding process, due to the addition of the arc, the heat input increases, and the formed molten pool and weld width are also larger, and the temperature of the weld that has been formed by laser-arc hybrid welding is still high, especially It is the weld seam temperature near the molten pool. If it is not protected or the protective gas coverage is not enough for comprehensive protection, it is easy to expose the high-temperature weld seam to an unprotected environment, and the weld seam will oxidize and turn blue or even black; Because there is a certain distance between the laser and the arc, the protective gas blown from the arc torch cannot fully cover the surface of the molten pool and the area near the front end of the molten pool, and it is easy to oxidize in the area where the laser interacts with the base metal, especially when the laser power is large. In some cases, the surface area of ​​the molten pool is large, and it is not enough to rely solely on the shielding gas blown out by the arc welding torch.

Images