摘要
首先建立了焊接过程及超声冲击过程有限元模型,得到超声冲击处理前后CP3钛合金焊接焊缝处残余应力分布规律;基于模拟仿真结果,进行了相应的工艺试验研究,以不同大小冲击载荷对焊缝处进行全覆盖冲击,采用小孔法测量不同处理条件下的残余应力值。结果表明,采用超声冲击处理方法,可将焊缝处的高值残余拉应力转化为压应力,残余应力降幅达到125%以上;随着冲击力的增加,压应力的幅值不断增大,但当冲击力达到60N后,压应力将趋于稳定,不再增加。
Residual stresses distribution induced by laser welding for CP3 titanium alloy was predicted by the finite element model. Residual stresses distribution of welded joints after ultrasonic impact treatment（UIT） were obtained. Welded joints were impacted by different magnitude of forces. A hole drilling method was used to determine the residual stresses. It reveals the tensile stresses of welded joints can be transformed into compressive stresses by using UIT. The compressive stresses rise with the increase of impact force. The stresses come to be steady when the impact force reaches 60N.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2014年第1期52-55,共4页
Journal of Aeronautical Materials
关键词
CP3钛合金
激光焊接
超声冲击
残余应力
CP3 titanium alloy
laser welding
uhrasonic impact treatment
residual stress
