高频感应加热处理对2219铝合金TIG焊接接头残余应力的影响

采用变极性TIG焊接方法焊接8 mm厚2219铝合金板材，利用高频感应加热技术对焊接接头分别进行90 ℃,140 ℃,190 ℃的热处理。热处理前、后采用X射线衍射法测试2219铝合金TIG焊接接头残余应力，分析了接头的微观组织与力学性能。结果表明，经140 ℃,190 ℃热处理后，焊接残余应力下降趋势明显，经90 ℃热处理后，残余应力下降幅度较小。与未热处理接头相比，经高频感应热处理后，焊接接头的微观组织、拉伸性能与硬度分布无明显变化。

Influence of high frequency induction heat treatment on residual stress in 2219 aluminum alloy TIG welded joint

The tungsten inert gas(TIG) welding was used to weld 8 mm-thick 2219 aluminum alloy, the high frequency induction heat treatment was carried out to welded joint at 90 ℃,140 ℃ and 190 ℃, respectively, and X ray diffraction method was used to measure welding residual stress before and after heat treatment, then microstructure and mechanical properties were analyzed. The results showed that effects of heat treatment on welding residual stress at 140 ℃ and 190 ℃ are significant, while that at 90 ℃ is relatively poor. Compared with the samples without heat treatment, no obvious change is observed in microstructure, tensile properties and distribution of hardness of welded joint.