热丝填充激光多层焊温度场和应力场的数值模拟
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摘要
基于有限元软件SYSWELD对20 mm厚316LN板热丝填充激光多层焊的温度场和应力场进行了三维动态数值模拟。利用生死单元法,采用双椭球体热源加3D高斯锥形热源的复合体热源模式来计算热丝填充激光焊过程,计算的焊缝横截面形状与试验结果基本吻合。计算结果表明,焊缝及附近区域表现出较高的焊接残余应力,而远离焊缝的区域,残余应力较小。所得到的多层焊沿厚度方向的残余应力分布规律符合实际,以及所计算的焊接变形与实测结果相吻合,这些可以为实际工程应用提供参考依据。
Based on the finite element software SYSWELD, three dimensional dynamic numerical simulation of temperature field and stress field of 20 mm thick 316LN plates during hot wire filler laser multilayer welding was carried out.Using the birth death element method, the double ellipsoid heat source and the 3D Gauss cone heat source composite heat source mode were used to calculate the hot wire filling laser welding process. The calculated cross section shape of the weld is basically consistent with the test results. The calculation results show that there is high welding residual stress in the weld and its vicinity, there is small residual stress away from the weld area. The multilayer welding residual stresses distribution along the thick direction is in good agreement with the actual and the calculated welding deformation is consistent with the measured results, which can provide reference for practical engineering application.
Based on the finite element software SYSWELD, three dimensional dynamic numerical simulation of temperature field and stress field of 20 mm thick 316LN plates during hot wire filler laser multilayer welding was carried out.Using the birth death element method, the double ellipsoid heat source and the 3D Gauss cone heat source composite heat source mode were used to calculate the hot wire filling laser welding process. The calculated cross section shape of the weld is basically consistent with the test results. The calculation results show that there is high welding residual stress in the weld and its vicinity, there is small residual stress away from the weld area. The multilayer welding residual stresses distribution along the thick direction is in good agreement with the actual and the calculated welding deformation is consistent with the measured results, which can provide reference for practical engineering application.
引文
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[2]陈武柱.激光焊接与切割质量控制[M].北京:机械工业出版社,2010.
[3]温鹏,郑世卿,荻崎贤二,等.填充热丝激光窄间隙焊接的实验研究[J].中国激光,2011,38(11):1103004.
[4]张屹,谭立鹏,张成磊.车用高强钢激光填充热丝对接焊间隙裕度研究[J].中国激光,2013,40(7):94-100.
[5]李俐群,陶汪,朱先亮.厚板高强钢激光填丝多层焊工艺[J].中国激光,2009,36(5):1251-1255.
[6]贾安东.焊接结构与生产[M].北京:机械工业出版社,2007.
[7]李俐群,张亮,戴景明.激光填丝多层焊温度场和应力场的数值模拟[J].中国激光,2011,38(10):41-45.
[8]褚庆臣,何秀丽,虞钢,等.不锈钢激光搭接接头温度场数值模拟及分析[J].中国激光,2010,37(12):3180-3186.