光纤激光-变极性TIG复合填丝焊接A7N01铝合金接头的组织与力学性能

采用光纤激光与变极性钨极惰性气体复合填丝焊接A7N01铝合金，经工艺参数优化，得到了成形良好、无缺陷的焊接接头。研究了这些接头的显微组织、拉伸和疲劳性能，并分析了疲劳断裂特征及断口形貌。研究结果表明,接头主要由细晶区、柱状晶和等轴树枝晶组成；焊态下接头抗拉强度均值为320 MPa，约为母材的75%；自然时效30天后，抗拉强度均值提高到369 MPa，达到母材的83%；断裂位置位于焊趾应力集中处，拉伸断口呈明显的韧窝状，为典型的韧性断裂；接头的疲劳极限为115 MPa。

Abstract

By the hybrid technique of fiber laser and variable polarity tungsten inert gas, A7N01 aluminum alloy is welded with filler wire. After optimizing process parameters, joints with good formation and without defects are obtained. The microstructure, tensile and fatigue properties of these joints are investigated, and the fatigue-fracture characteristic and fracture morphology are examined. The research results indicate that these joints are mainly composed of fine-grained zone, columnar grains, and equiaxed dendrites. The average tensile strength of these as-welded joints is 320 MPa, around 75% of that of base metals. After natural aging of 30 days, the average tensile strength increases to 369 MPa, around 83% of that of base metals. Fractures locate at the stress concentration zone of the weld toe, and the fracture shows an obvious dimple shape, which is the unique characteristic of ductile fracture. The fatigue limit of these joints is 115 MPa.

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乔俊楠, 王启明, 邹江林, 吴世凯. 光纤激光-变极性TIG复合填丝焊接A7N01铝合金接头的组织与力学性能[J]. 中国激光, 2016, 43(9): 0902001. Qiao Junnan, Wang Qiming, Zou Jianglin, Wu Shikai. Microstructure and Mechanical Property of A7N01 Aluminum Alloy Joints by Fiber Laser-Variable Polarity TIG Hybrid Welding with Filler Wire[J]. Chinese Journal of Lasers, 2016, 43(9): 0902001.

光纤激光-变极性TIG复合填丝焊接A7N01铝合金接头的组织与力学性能

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