对6016铝合金激光焊接接头的力学性能开展研究,分析焊后时效热处理对其力学性能的影响规律.结果表明:焊后时效处理可以提高焊接接头的力学性能,采用(180℃+10h)时效处理工艺可将焊缝中心的硬度从58HV提高到82 HV,可将焊接接头的拉伸强度从180MPa提高到274MPa,时效强化效果明显.动力学分析表明,6016铝合金焊接接头时效强化过程符合Johnson-Mehl-Avrami (JMA)方程.当时效温度升高,接头中强化相体积分数的变化率也随之增大,合金硬度上升速率增加,达到峰值硬度所需时间变短.
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