Abstract: Laser-hybrid welding is an ideal technique to realize high-quality, high-efficiency and low-cost welding manufacturing of aluminium alloy body for high-speed train. Laser-MIG hybrid welding procedure tests were carried out on 6A01-T5 aluminium alloy profiles with thickness of 3 mm, which used for high-speed train body. The influence rules of welding parameters on weld formation and porosity defects were studied. The microstructures characteristic, microhardness distribution, tensile and fracture properties were also investigated. The results indicated that adopted lower laser power, lower arc current or lower welding speed was beneficial to reduce porosity defects when the weld penetration met the requirements. From fusion zone center to base material, the microstructures consisted of equiaxed zone, columnar zone, partially melted zone, over-aged zone and the base material. Compared with the arc active zone, the equiaxed grain was smaller and the width of the partially melted zone was narrower. The joints were softened, the lowest microhardness value was appeared in the weld zone, and the width of the heat affected zone was about 1.5 mm. The average tensile strength of the joints reached to 197.5 MPa, which was 80.6% of the base metal, the fractures occurred in the weld seam and the fracture morphology showed obvious ductile fracture features. The fracture strength of the joints was 93.5 MPa, the fracture crack initiated in the weld surface, and the fracture morphology of the crack propagation zone showed typical mixed fracture features with ductile fracture and brittle fracture.
马国龙, 张志毅, 毛镇东, 李刚卿, 韩晓辉, 杨志斌. 高速列车用铝合金型材激光-MIG复合焊工艺特性和接头性能[J]. 材料导报, 2023, 37(12): 21110142-6.
MA Guolong, ZHANG Zhiyi, MAO Zhendong, LI Gangqing, HAN Xiaohui, YANG Zhibin. Processing Characteristics and Joints Properties of Laser-MIG Hybrid Welding for Aluminium Alloy of High-speed Trains. Materials Reports, 2023, 37(12): 21110142-6.
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2023, Vol. 37 
