超声波法测量焊接接头的纵向残余应力研究  

Study on Longitudinal Residual Stress Measurement of Welded Joint by Ultrasonic Method

作　　者：邹双阳 潘航[1] 李凯远 何志浩[1] 徐攀[1] 苟国庆[1] 

机构地区：[1]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《热加工工艺》2017年第15期219-222,共4页Hot Working Technology

基　　金：西南交通大学大学生科研训练计划(SRTP)第十期项目(151010)

摘　　要：使用不同频率的探头对7N01铝合金焊后板材的母材区、热影响区及焊缝区的应力常数K进行了标定,并使用超声波设备测量了7N01铝合金板材的纵向应力。结果表明:由于微观组织不同,焊接接头不同区域不同深度的应力常数K确实存在差异;K值修正后垂直于焊缝方向的纵向应力分布趋势不变。热影响区和焊缝区修正后的应力值增大,且热影响区的波峰应力值增加最大,测量结果更安全。The stress coefficient K values of base metal, heat affected zone and weld zone of 7N01 aluminum alloy welded sheet were calibrated by using probes with different frequencies, and the longitudinal stress of 7N01 aluminum alloy sheet was measured by using ultrasonic device. The results show that there are difference in the stress constant K value at different depths of the welded joints because of the different microstructure. The trend of longitudinal stress distribution in the direction perpendicular to the weld seam after the correction of K is unchanged. The stress values of heat affected zone and weld zone increase, and the peak stress value in the heat affected zone increases maximum. The measurement results are more secure.

关 键 词：超声波法 纵向残余应力 探头频率 K值标定 

分 类 号：TG404[金属学及工艺—焊接]