铝/钢电弧辅助激光熔钎焊焊接过程热特性分析  

Thermal characterization of aluminum/steel arc-assisted laser welding-brazing process

作　　者：于晓全[1] 黄健康[1] 李卓轩 吴昊盛 樊丁[1] Yu Xiaoquan;Huang Jiankang;Li Zhuoxuan;Wu Haosheng;Fan Ding(Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学,兰州730050

出　　处：《焊接》2022年第9期17-24,共8页Welding & Joining

摘　　要：采用有限元建模分析方法,建立了铝/钢电弧辅助激光熔钎焊焊接过程的三维非线性温度场计算模型,研究了热源间距、焊接电流和激光热输入等参数对接头表面温度分布和界面热循环的影响。结果表明,工件表面高温区呈现为前大后小的“葫芦”状分布,界面热循环曲线呈现出双峰特征,激光热输入决定了竖直界面的最高峰值温度,焊接电流和热源间距主要影响热循环曲线冷却阶段。界面热循环峰值温度的提高,会导致金属间化合物层厚度的增加,影响接头组织演变。A three-dimensional nonlinear temperature model was established by finite element modeling analysis during aluminum-steel arc-assisted laser welding-brazing process.Effects of parameters such as heat source distance,welding current and laser heat input on surface temperature distribution and interfacial thermal cycling of welded joints were studied.The result showed that high temperature area on the surface of workpiece presented a“gourd-like”shape distribution with large front and small back,and thermal cycle curve of interface presented a bimodal characteristic.Laser heat input determined the highest peak temperature of vertical interface,and welding current and distance of heat sources mainly affected cooling stage of thermal cycle curve.Increase of peak temperature at interface could increase thickness of intermetallic compound layer,which influenced microstructure evolution of welded joints.

关 键 词：电弧辅助激光熔钎焊 铝/钢 有限元建模 热特性 

分 类 号：TG456.7[金属学及工艺—焊接]