采用FSW与MIG工艺补焊6005A-T6铝合金的接头力学性能Mechanical properties of repairing welding joints of 6005A-T6 aluminum alloy prepared by FSW and MIG processes

针对6005A-T6铝合金型材搅拌摩擦焊接头缺陷补焊的应用要求，研究搅拌摩擦焊(FSW)补焊和熔化极气体保护焊(MIG)补焊工艺，对两种补焊接头的力学性能进行分析。结果表明：FSW补焊与MIG补焊方法均可以消除FSW接头缺陷，两种补焊接头的强度均达到无缺陷的FSW接头强度的88%以上，FSW补焊接头的平均抗拉强度为216.72 MPa，平均屈服强度为145.5 MPa，略高于MIG补焊接头的平均抗拉强度(206.2 MPa)和平均屈服强度(134.07 MPa)。两种补焊的接头硬度最低值都出现在热影响区，最高值都出现在母材区。

For the repairing welding demands of friction stir welding defects of 6005A-T6 aluminum alloy, the repairing welding processes of friction stir welding (FSW) and metal inert-gas welding (MIG) were investigated. The mechanical properties of the repairing welding joints prepared by FSW and MIG processes were analyzed. The results show that both the repairing welding methods can eliminate the FSW defects and the strength of the repairing welding joints can reach above 88% of the strength of defect-free FSW joints. The tensile strength and the yield strength of the FSW repairing welding joints are 216.72 and 145.5 MPa, which are slightly higher than those of MIG repairing welding joints (206.2 and 134.07 MPa), respectively. The lowest microhardnesses of both the FSW and MIG repairing welding joints appear in the heat-affected zone, and the highest microhardnesses appear in the base metal zone.

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