Influence of Different Offsets on the Mechanical and Fatigue Properties of Friction Stir Weld Lap Joints

Yang LIU; Hongji XU; Zhiheng QIN

doi:10.7512/j.issn.1001-2303.2022.08.13

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Influence of Different Offsets on the Mechanical and Fatigue Properties of Friction Stir Weld Lap Joints
Vol. 52, Issue 8, Pages: 95-100(2022)
DOI： 10.7512/j.issn.1001-2303.2022.08.13

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刘洋，许鸿吉，秦志恒.不同偏移量对6005A-T6对搭接搅拌摩擦焊接头力学性能及疲劳性能的影响［J］.电焊机，2022，52（8）：95-100.

LIU Yang, XU Hongji, QIN Zhiheng.Influence of Different Offsets on the Mechanical and Fatigue Properties of Friction Stir Weld Lap Joints[J].Electric Welding Machine, 2022, 52(8): 95-100.
刘洋，许鸿吉，秦志恒.不同偏移量对6005A-T6对搭接搅拌摩擦焊接头力学性能及疲劳性能的影响［J］.电焊机，2022，52（8）：95-100. DOI： 10.7512/j.issn.1001-2303.2022.08.13.

LIU Yang, XU Hongji, QIN Zhiheng.Influence of Different Offsets on the Mechanical and Fatigue Properties of Friction Stir Weld Lap Joints[J].Electric Welding Machine, 2022, 52(8): 95-100. DOI： 10.7512/j.issn.1001-2303.2022.08.13.

摘要

在FSW过程中，由于待焊材料的变形或者操作失误等原因，可能发生搅拌针未对准接头中心线造成偏移，对接头质量产生不利影响，因而对偏移量的研究很有必要。采用搅拌摩擦焊对6005A-T6中空铝型材进行焊接，制备不同偏移量的对搭接搅拌摩擦焊（FSW）接头，并进行拉伸试验以及恒定载荷下的疲劳试验，探究不同轴肩偏移量对接头抗拉强度和疲劳性能的影响。结果表明：6种搅拌针轴肩偏移量下的试件抗拉强度值都分布在200±10 MPa附近，表明偏移量对抗拉强度的影响不明显，通过计算接头强度系数，发现6种搅拌针轴肩偏移量下的对搭接接头强度系数均高于0.7，可判定为合格；轴肩偏移为AS3 mm和RS1.8 mm下的两组试件，当最大载荷值为55 MPa时，均在指定寿命下未出现失效，可判定疲劳性能合格，而在较大载荷下，试验测试试件均在指定寿命内失效，断裂位置为热影响区和熔合线结合处，表明该位置的应力集中较大。

Abstract

In the welding process, due to the deformation of the material to be welded or the operation error, the stirring needle may be misaligned with the center line of the joint, which may cause an offset, which will adversely affect the quality of the joint. Therefore, it is necessary to study the offset. Use friction stir welding to weld 6005A-T6 hollow aluminum profiles, prepare butt-lap friction stir welding (FSW) joints with different offsets, perform tensile tests and fatigue tests under constant load, and explore the effect of different shaft shoulders on the tensile strength and fatigue performance. The results show that the tensile strength values of the specimens under the offset of the shaft shoulder of the six stirring needles are distributed around 200±10 MPa, which indicates that the influence of the tensile strength is not obvious. By calculating the joint strength coefficients, it is found the butt-lap joint strength coefficients under the shoulder offset are all higher than 0.7, which can be judged as qualified; for the two groups of test pieces with shoulder offset of AS3 mm and RS1.8 mm, when the maximum load value is 55 MPa ,there is no failure under the specified life, and the fatigue performance can be judged to be qualified. Under a larger load, the test specimens all fail within the specified life. The fracture position is the junction of the heat-affected zone and the fusion line, indicating that the position is the stress concentration is greater.

关键词

搅拌摩擦焊轴向偏移抗拉强度疲劳性能

Keywords

friction stir weldingaxial offsettensile strengthfatigue performance

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