(3) Aluminum/steel large spot Nd:YAG laser + pulse MIG composite heat source high-efficiency melting - Brazing technology based on laser + arc composite heat source welding process, the laser energy is precisely adjustable and the laser has stable arc and improves the stability of the welding process In order to improve the welding speed, a large-spot laser-arc composite heat source for welding dissimilar metals is proposed. High-quality high-efficiency fusion-bending connection of 5A02 aluminum alloy sheet and cold-rolled hot-dip galvanized steel sheet and cold-rolled hot-dip aluminized steel sheet with large spot Nd:YAG laser + pulsed MIG composite heat source welding (aluminum base metal for fusion welding, weld seam) It is brazed to the steel base metal. The maximum welding speed can reach 5.0m/min. The fracture position of the tensile specimen occurs in the heat affected zone of the aluminum base metal. The maximum tensile strength of the joint can reach 5A0 2 aluminum alloy base material. The tensile strength is about 75%, which is close to the strength of the ordinary fusion welded joint of 5A0 2 aluminum alloy. X-ray diffraction analysis showed that Fe3Al, FeAl 2 , Fe 2 Al 5 and FeAl 3 intermetallic compounds were formed at the interface of the brazing joint of aluminum/steel-weld joint. The thickness of the compound layer was in the range of 1.5~4μm, Al- The presence of the Fe intermetallic compound layer has little effect on the strength of the joint; the energy spectrum analysis shows that the Al and Fe atoms at the interface of the joint brazing joint are sufficiently diffused. Figure 14 shows the weld of 5A02 aluminum alloy sheet and cold-rolled hot-dip galvanized steel sheet welded by large spot Nd:YAG laser + pulse MIG composite heat source high-efficiency fusion-brazing technology. Harbin Welding Research Institute has successfully applied the research and development of laser + arc hybrid heat source welding technology to the production of actual products. Typical products are stainless steel large display housing (thickness 1.5mm, size 900mm × 650mm × 160mm) welding, The welding deformation problem of large thin-walled members is effectively solved; the welding of high-strength steel and ultra-high-strength steel shock absorber steel body and cylinder (strength 1000～1780MPa, thickness 12～25mm) effectively solves welding cracks and cylinders Burning of the inner chrome plating layer and deformation of the member. Figure 15 shows the welding of the shock absorber cylinder using laser + arc hybrid heat source welding technology. Harbin Welding Research Institute has successfully solved the stainless steel double-sided composite board by laser + arc composite heat source welding technology (the thickness of the stainless steel composite layer is about 0.15mm, the material is 0Cr18Ni9Ti, the base layer is made of Q235 low carbon steel material, and the thickness is 1.0~2.0 Between mm) Corrosion and deformation of welded joints. In addition, Harbin Welding Research Institute has applied laser + arc hybrid heat source welding technology to the repair of large aluminum alloy molds, and successfully solved the welding deformation problem of large aluminum alloy mold repair. Fourth, the conclusion Harbin Welding Research Institute has done a lot of work in laser and laser + arc hybrid heat source welding technology research, and applied the research results to the actual product manufacturing, solving the welding technology problems of various products. At present, the laser welding process is relatively mature, and for the new welding technology of laser + arc hybrid heat source welding, the research work mainly focuses on the process characteristics of this welding method, and the interaction between laser and arc in the laser + arc composite heat source welding. Problems such as mechanism and characteristics of welding heat sources need to be further studied theoretically. Previous page stainless steel sink strainer can be used for fruit and vegetable washing drain basket, it is a useful stainless steel kitchen tool and it also called Draining Rack or draining basket. It is very useful when you wash your fruit and vegetable, it will make your fruit and vegetable health to eat.
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2. Application of laser + arc hybrid heat source welding technology 
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