Repair Process of Linear Defects on the Back of 2Al4 Aluminum Alloy FSW Weld

XU Hui; LIU Kuan; XU Yaozhong; YU Wenkai; LIU Ting; WANG Xiaohan; XU Xuehua

doi:10.7512/j.issn.1001-2303.2023.03.14

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Repair Process of Linear Defects on the Back of 2Al4 Aluminum Alloy FSW Weld
Vol. 53, Issue 3, Pages: 117-123(2023)
DOI： 10.7512/j.issn.1001-2303.2023.03.14

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许辉，刘宽，徐耀钟，等.2A14铝合金FSW焊缝背部线状缺陷返修工艺［J］.电焊机，2023，53（3）：117-123.

XU Hui, LIU Kuan, XU Yaozhong, et al.Repair Process of Linear Defects on the Back of 2Al4 Aluminum Alloy FSW Weld[J].Electric Welding Machine, 2023, 53(3): 117-123.
许辉，刘宽，徐耀钟，等.2A14铝合金FSW焊缝背部线状缺陷返修工艺［J］.电焊机，2023，53（3）：117-123. DOI： 10.7512/j.issn.1001-2303.2023.03.14.

XU Hui, LIU Kuan, XU Yaozhong, et al.Repair Process of Linear Defects on the Back of 2Al4 Aluminum Alloy FSW Weld[J].Electric Welding Machine, 2023, 53(3): 117-123. DOI： 10.7512/j.issn.1001-2303.2023.03.14.

摘要

针对2A14铝合金搅拌摩擦焊（FSW）焊缝背部线状缺陷，设计了4种不同的方案对其进行返修，分析了不同返修方法对焊缝缺陷消除、接头力学性能以及接头组织的影响，研究了其焊缝背部缺陷返修的工艺特性。结果表明，4种方法均可消除未焊透缺陷。直接采用FSW返修可返修4次，但多次返修会造成焊缝减薄，抗拉强度下降，重复搅拌摩擦焊对焊缝组织影响较小；打磨焊缝背部缺陷后，采用TIG焊填料焊缝正面后再进行FSW返修，焊缝无明显减薄，抗拉强度有一定的下降，且2次返修的抗拉强度较一次有明显下降，次数应不超过2次，焊缝中残留的熔焊支状晶降低了返修后的接头性能；打磨后采用TIG焊填料并修平后进行FSW返修，两次返修接头强度未出现降低，熔焊填料的组织能够全部转化为FSW组织；打磨背部缺陷后TIG填料也能消除未焊透缺陷，但出现了明显的气孔甚至裂纹缺陷，强度严重下降，不宜采用。此外，选用较大的尺寸的搅拌头有助于维持焊缝强度。

Abstract

The linear defect on the back of 2A14 aluminum alloy friction stir welding (FSW) was repaired, analyzed the effects of different repair methods on the elimination of weld defects, mechanical properties and microstructure of the joint, and studied the process characteristics of the repair of weld back defects. The results show that four methods can eliminate incomplete penetration defects. Directly using FSW for repair can be repaired four times, but multiple repairs can cause weld thinning and tensile strength reduction. Repeated friction stir welding has a small impact on weld microstructure; After polishing the defects on the back of the weld, use TIG welding filler on the front side of the weld, and then conduct FSW repair, the weld has no obvious thinning, and the tensile strength has decreased to a certain extent. The tensile strength of the two repairs has decreased significantly compared to that of the first one, and the number of times should not exceed 2. The residual fusion welding dendrites in the weld reduce the performance of the repaired joint; After polishing, TIG welding filler was used and smoothed, and FSW repair was performed, the strength of the joint repaired twice did not decrease, and the microstructure of the fusion welding filler could be fully converted to FSW microstructure; After polishing the back defects, TIG filler can also eliminate the lack of penetration defects, but there are obvious air holes and even cracks, which seriously reduce the strength and are not suitable for use. In addition, selecting a larger size stirring head helps to maintain weld strength.

关键词

2A14铝合金搅拌摩擦焊背部线状缺陷返修

Keywords

2A14 aluminum alloyfriction stir weldingback linear defectrepair

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