摘要
提出了一种修正的曲线峰值递减锥体热源+峰值递增柱状热源的复合式热源模型,采用该热源模型进行高氮钢激光-电弧复合焊温度场数值模拟,获得高氮钢激光-电弧复合焊焊接过程温度分布。结果表明,修正的热源模型能够对高氮钢激光-电弧复合焊焊缝成形进行较好的表征,模拟计算得到的熔池轮廓与实际测量值吻合较好。由于电弧减缓了材料的冷却速度,熔池呈现泪滴状拖尾,可以较好地表征熔池移动行为。采用模拟计算分析得到的优化工艺参数进行焊接试验,焊后接头力学性能测试结果表明,焊缝最高抗拉强度为1 049 MPa,达到母材的95.4%,焊缝冲击吸收功可达母材的87.5%,为高氮钢激光-电弧焊接工艺的制订提供了指导。
According to the shape of the molten pool under the actual welding condition,a modified composite heat source model with linearly decreasing-rotational body based on logarithm curve mode and linearly increasing cylinder mode was presented.Using this model,the temperature field of hybrid laser arc welding of high nitrogen steel was simulated.The results showed that the modified heat source modelcould be used to characterize the forming of composite welding.The depth and width of fusion were in good agreement with the actual size of welded joint.As the arc slowed down the cooling rate,the molten pool presented a tail,which showed the movement better.Using the optimized parameters,the experiment was carried out and the mechanical properties of welded joint showed that the maximal tensile strength was 1 049 MPa and was 95.4%of that of the base metal.The impacting work was 87.5%of the that of base metal.It provided induction for hybrid laser arc welding on high nitrogen stainless steel.
作者
黄俊
宋恺
陈雨昕
刘其蒙
江俊龙
王克鸿
HUANG Jun;SONG Kai;CHEN Yu-xin;LIU Qi-meng;JIANG Jun-long;WANG Ke-hong(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu pro.,China)
出处
《焊接技术》
2018年第4期22-26,171,172,共6页
Welding Technology
基金
国防技术基础科研计划资助项目(JSCG2017606B005)
江苏省重点研发计划资助项目(BE2015064)
关键词
激光技术
激光电弧复合焊接
数值模拟
温度场
aser technology
hybrid laser arc welding
numerical simulation
temperature field
