铝合金平板变极性等离子弧焊数值模拟与残余应力预测  

Simulation on VPPA Welding of Aluminum Alloy Plate and Residual Stress Predicting

作　　者：米国发[1] 赵大为[1] 牛济泰[2] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454003 [2]哈尔滨工业大学现代焊接生产技术国家重点实验室,黑龙江哈尔滨150001

出　　处：《热加工工艺》2009年第5期104-106,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(90205035)

摘　　要：利用有限元方法对铝合金平板变极性等离子弧焊(VPPAW)焊接过程进行了数值模拟。首先应用三维双椭球热源模型作为输入热源,对VPPAW焊接过程中的焊件温度场及应力场进行了模拟计算。高度不均匀的焊接温度场,导致构件中产生较大的残余应力。最后,对不同对接参数下的焊后平板残余应力进行了测试,并将有限元计算结果与残余应力的实测结果进行了对比,结果显示错边量的大小会对焊后残余应力产生影响;有限元模拟结果与实测结果具有很好的一致性。The process of variable polarity plasma arc welding （VPPA） for aluminum alloy plate was simulated using finite element method. The welding temperature field and stress field were calculated using a 3D double-ellipsoidal head source model as the input heat source. The highly non-uniform welding temperature field caused large residual stress in the welding plate. The welding residual stress of the welding plates under different welding parameters was predicted atter Welding. The results of prediction and actual measurement were contrasted finally. The results show that the unfitness of the joint can affect the welding residual stress; the results of finite element simulation accords well with that of the actual measurrnent.

关 键 词：焊接 VPPA焊 残余应力 有限元 

分 类 号：TG456.2[金属学及工艺—焊接]