Study on welding stress relief of titanium alloy by thermal aging and ultrasonic impact

钛合金热时效与超声冲击焊接应力消除研究 Study on welding stress relief of titanium alloy by thermal aging and ultrasonic impact 郝子龙 HAO Zilong 1 first-author 张粉萍 ZHANG Fenping 1 刘子聪 LIU Zicong 1 李正勇 LI Zhengyong 1 李松伟 LI Songwei 1 牛香草 NIU Xiangcao 1 江麓机电集团有限公司工艺研究院 江麓机电集团有限公司工艺研究院 Technology Research Institute of Jianglu Electromechanical Group Co.,Ltd. Technology Research Institute of Jianglu Electromechanical Group Co.,Ltd. 以TC4钛合金焊接试板为研究对象,采用盲孔法检测其焊接残余应力,然后分别采用热时效和超声冲击法消除焊接残余应力,并对比热时效和超声冲击消除焊接残余应力的效果。结果表明:热时效可以大幅降低焊接残余应力,残余拉应力消除率<100%,但不能产生压应力;相较于热时效,超声冲击具有较好的效果,残余拉应力消除率为100%,可以将有害的焊接残余拉应力转换为有利于疲劳强度和疲劳寿命的压应力。建议采用超声冲击消除钛合金焊缝的残余应力。 Taking TC4 titanium alloy welding test plate as the research object, the welding residual stress was detected by blind hole method, and then the welding residual stress was eliminated by thermal aging and ultrasonic impact methods respectively. And the effects of the welding residual stress relief by thermal aging and ultrasonic impact were studied. The results show that thermal aging can significantly reduce the welding residual stress, and the residual tensile stress relief rate is less than 100%, but the compressive stress can not be generated. Compared with thermal aging, ultrasonic impact has a better effect and the residual tensile stress relief rate is 100%,which can convert the harmful welding residual tensile stress into compressive stress which is beneficial to the fatigue strength and fatigue life. It is suggested to use ultrasonic impact to eliminate residual stress of titanium alloy weld. 钛合金 热时效 超声冲击 焊接残余应力 titanium alloy thermal aging ultrasonic impact welding residual stress TG404 2022-03-08 11 51