ICAA13: 13th International Conference on Aluminum Alloys - 13th International Conference on Aluminum Alloys
ICAA13: 13th International Conference on Aluminum Alloys - 13th International Conference on Aluminum Alloys
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ICAA13：第13届国际铝合金会议 - 第13届国际铝合金会议
DOI：
10.1002/9781118495292.ch101
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Chen Y
中科院分区：
文献类型：
--
作者：
Chen Y
与以前发表的报告相比，它表明，有一个可观察到的热影响区时，超声点焊（USW）汽车合金，如AA 6111-T4，其严重程度取决于焊接能量。焊接后立即观察到相对于T4条件的软化，但这通过自然时效迅速恢复，这掩盖了HAZ的存在，并且焊接强度最终超过母材。这种行为是由T4板中的溶质团簇/GPZ的溶解引起的，由于高焊接温度（> 400 °C），结合加速的焊后自然老化到比母材更高级的状态。模拟表明，这种加速的自然老化行为可归因于USW工艺产生的过量空位浓度。
In contrast to previously published reports, it is shown that there is an observable HAZ when ultrasonic spot welding (USW) automotive alloys, like AA6111-T4, the severity of which depends on the welding energy. Immediately after welding, softening is seen relative to the T4 condition, but this is rapidly recovered by natural ageing, which masks the presence of a HAZ, and the weld strength eventually exceeds that of the parent material. This behaviour is caused by dissolution of the solute clusters/GPZs in the T4 sheet, due to the high weld temperatures (> 400 °C), combined with accelerated post-weld natural ageing to a more advanced state than in the parent material. Modelling has demonstrated that this accelerated natural ageing behaviour can be attributed to an excess vacancy concentration generated by the USW process.