超声冲击对SMA 490BW耐候钢焊接残余应力的影响

Research on the residual stress of SMA 490BW atmospheric corrosion resistant steel treated by ultrasonic impacting

对SMA 490BW耐候钢进行气保焊焊接,利用超声冲击设备对焊接对接接头进行超声处理,并通过盲孔法对超声冲击前后的残余应力进行测试及分析。结果表明,超声冲击对于焊缝及其附近区域残余应力的降低效果十分明显,横向残余应力消除率最高达161%,纵向残余应力最高达118%;超声冲击处理后,同一位置纵向残余应力消除率较横向残余应力要大。

Gas shielded welding was done on SMA490 BW atmospheric corrosion resistant steel,and ultrasonic impact treatment was made to the welded butt joint by ultrasonic impact equipment.The residual stresses were tested and analyzed before and ＇after ultrasonic impact by adopting blind-hole method. Finally, the results show that there is obvious effect on residual stress elimination of welding seam and its area nearby after ultrasonic impact treatment.The highest elimination rate of longitudinal residual stress reaches 161% ,while the horizontal residual stress could reach 118%.Moreover,the longitudinal residual stress has a bigger elimination rate than that of horizontal one at the same position.