坡口形式对SUS304奥氏体不锈钢对接接头残余应力和变形的影响

Influence of groove type on residual stress and distortion in SUS304 austenitic stainless steel butt weld

以ABAQUS软件为平台,开发了热-弹-塑性有限元计算方法用于模拟V形、K形和X形坡口SUS304奥氏体不锈钢多层多道焊对接接头的温度场、残余应力和焊接变形.同时,采用试验的方法测量了接头的残余应力和角变形.计算得到的焊接残余应力和角变形与实测结果吻合良好,验证了计算方法的妥当性.结果表明,坡口形式对接头的残余应力和角变形有显著的影响:V形坡口的高拉伸残余应力区和角变形均明显大于K形坡口和X形坡口,而K形坡口则略大于X形坡口;坡口形式对纵向残余应力的峰值影响较小.

Based on software ABAQUS,a thermal-elasticplastic finite element computational method was developed to simulate welding temperature field,distribution of residual stress and deformation of 10 mm thick SUS304 austenitic stainless steel plate joints with V-,K-,and X-type grooves. The simulated welding residual stress and angular distortion in the butt weld agreed well with the experimentally measured results,which verified the accuracy of the proposed computational procedure. The results show that the groove shape had prominent influence on the distribution of residual stress and angular distortion. The zone with high tensile longitudinal residual stress and angular distortion were significantly larger with V-groove than with K-groove and X-groove,and those with K-groove were slightly larger than with X-groove. However,the type of groove had little influence on the peak value of longitudinal residual stress.