Comparison of Fiber Laser-MIG Arc Hybrid and Fiber Laser Welding of 6009 Aluminum Alloy

The effect of different bonding technology on welding point weld appearance,microstructure,tensile properties,microhardness,fracture morphology of 6mm 6009 aluminum alloys which was welded by fiber laser and fiber laser-MIG arc hybrid welding were studied.The results showed that the speed of laser-MIG hybrid welding is 3times of that of laser welding;laser-arc hybrid welding microstructure is better than laser welding microstructure;the tensile strength of the laser-MIG hybrid welding welded joints has reached 63% of the tensile strength of base material,while the tensile strength of laser welding is only 38% of that of the base material;the composite welding had softening zone,but laser welding almost have no softening one;the tensile fracture of laser-MIG hybrid welding and laser welding have typical dimples,but laser-MIG hybrid welding zone′s dimples are more even.