铝合金电阻点焊接头缺陷的搅拌摩擦修复

张勇; 叶武; 周昀芸; 谢红霞; 张志函; 褚强; 李文亚

铝合金电阻点焊接头缺陷的搅拌摩擦修复

1.
西北工业大学摩擦焊接陕西省重点实验室, 西安 710072
2.
凝固技术国家重点实验室, 西安 710072

基金项目: 国家自然科学基金资助项目（51275418）；陕西省重点科技创新团队资助项目（2014KCT-12）；陕西省科技统筹创新工程计划资助项目（2012HBSZS021）

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出版历程
- 收稿日期: 2015-11-09

Defect repair of resistance spot welded aluminum alloy joint by friction stirring

1.
Shanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an 710072, China
2.
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

摘要

摘要: 针对铝合金电阻点焊极易产生裂纹、缩孔等缺陷的问题，提出了基于无针搅拌摩擦热力耦合效应修复铝合金电阻点焊接头缺陷的方法.通过改变搅拌头转速和摩擦停留时间等参数，研究了热力耦合效应对裂纹及缩孔缺陷的修复效果和影响规律.结果表明，在合适的搅拌摩擦工艺下，单面处理可实现熔核内条型裂纹的修复，但缩孔缺陷仍然存在，性能没有明显改善；双面下冲处理能有效修复熔核内条型裂纹及缩孔缺陷，接头断裂方式为脆性断裂，最大拉剪力从3.20 kN增加到6.14 kN，证明搅拌摩擦热力耦合效应修复铝合金电阻点焊接头缺陷的方法是可行的.
- 铝合金 /
- 电阻点焊 /
- 裂纹 /
- 缩孔 /
- 搅拌摩擦
Abstract: For the defects such as crack and shrinkage in the resistance spot welded aluminum alloy joint, a repairing method based on the needleless friction stir thermal-mechanical coupling effect is proposed. By changing parameters such as rotational speed and dwell time, the repair effect and the influence factors on the defects were studied. The results showed that the bar type cracks could be repaired by single-side processing with a proper friction stir parameters, but the shrinkage defect still existed and there was no significant improvement in the performance of the repaired joint. The double-side processing could effectively repair the bar type crack and shrinkage, as a result, the maximum tensile shear was increased from 3.20 kN to 6.14 kN. The fracture mode of the joints after repairing was brittle failure, confirming that the proposed method is feasible and effective.
- aluminum alloy /
- resistance spot welding /
- crack /
- shrinkage /
- friction stir

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参考文献(10)

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