摘要
为了定量比较激光焊(LBW)与惰性气体保护焊(MIG)导致的焊接变形和残余应力的差异,以厚度为4 mm的SUS304不锈钢焊接接头为研究对象,基于有限元软件MSC.Marc,在同时考虑材料和几何非线性的情况下,开发热-弹-塑性有限元方法对两种不同焊接方法所引起的焊接变形和残余应力进行了数值计算。同时采用小孔法和三坐标测量法分别测量了MIG接头的焊接残余应力和变形。结果表明无论是焊接变形还是残余应力,试验结果与仿真计算的结果都有很好的一致性,从而验证了本研究所开发的计算方法的有效性。基于数值模拟的结果可知,与MIG相比,采用LBW可以使薄板的焊接面外变形降低75%左右;LBW导致的纵向残余应力峰值与MIG相比差别不大,但高拉伸应力的分布范围降低了50%左右;对于横向残余应力,无论是峰值还是高拉伸应力的范围,LBE均远小于MIG。此研究得到的结论对于大量推广激光焊用于不锈钢薄板焊接变形与应力的控制提供了借鉴作用。
In order to quantitatively compare the difference between welding deformation and residual stress caused by laser welding(LBW)and metal inert-gas welding(MIG),a thermal-elastic-plastic finite element method based on MSC is used to calculate the welding deformation and residual stress caused by these two different welding methods under considering both materials and geometric non-linearity.Meanwhile,hole-drilling method and portable three–coordinate measuring machine are employed to measure the welding residual stress and deformation of the MIG joint.The effectiveness of the developed computational approach is verified by the experiments.Based on the results of nu-merical simulation,it can be seen that LBW can reduce the out-of-plane distortion of thin plates by about 75%,com-pared with MIG;The peak value of longitudinal residual stress caused by LBW is not much different from MIG,but the distribution range of high tensile stress can be reduced by 50%.For transverse residual stress,both the peak value and the range of high tensile stress,the LBW is much smaller than the MIG.The conclusions obtained from this study pro-vide a reference for controlling the deformation and stress if the LBW is used to join thin stainless steel sheets.
作者
逯世杰
郑颖
王虎
邓德安
LU Shijie;ZHENG Ying;WANG Hu;DENG De’an(School of Material Science and Engineering,Chongqing University,Chongqing 400044,China;Chongqing Water Conservancy and Electric Power Building Survey Design Institute,Chongqing 400020,China)
出处
《激光杂志》
北大核心
2019年第11期144-149,共6页
Laser Journal
基金
国家自然科学基金(No.51875036)
关键词
激光焊
惰性气体保护焊
数值模拟
焊接变形
焊接残余应力
laser beam welding
metal inert-gas welding
numerical simulation
welding deformation
residual stress
