镁/钛异种金属冷金属过渡焊接的温度场模拟  

Numerical simulation on temperature distribution of cold metal transfer joining magnesium to titanium dissimilar metals

作　　者：王岑[1] 曹睿[1] 林巧力[1] 王清[2] 董闯[2] 陈剑虹[1] 

机构地区：[1]兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室,兰州730050 [2]大连理工大学三束材料改性教育部重点实验室,大连116024

出　　处：《焊接学报》2015年第4期17-20,114,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51265028);三束材料改性教育部重点实验室(大连理工大学)开放课题(LABKF1402)

摘　　要：利用ABAQUS有限元软件建立镁/钛异种金属搭接接头的有限元模型,对镁/钛异种金属冷金属过渡焊接过程的温度场进行模拟,分析温度场的变化规律,并通过试验验证模拟结果的准确性.比较了不同送丝速度下温度场的变化规律,并对特征点的显微组织进行比较.结果表明,镁、钛两侧的温度场呈不对称分布.距离焊缝中心相同的两点,镁板侧试件温度上升较快,达到的峰值温度比钛板侧高,且下降速度也快.随着送丝速度的增加,峰值温度变高,达到钛板的熔化温度,钛的熔化量也就随之增加,镁钛连接界面有较好的结合.Using ABAQUS finite element software,a finite element model was established on magnesium / titanium dissimilar metal cold metal transfer lap joint to numerically simulate the temperature distribution. The simulated temperature field was verified by experimental results. The variation of temperature field and microstructure at specified location of the joint were compared at different wire feed speeds. The results show that the distribution of temperature field was asymmetric on magnesium and titanium sides. At two locations with the same distance from the weld center, the temperature rose rapidly on magnesium side,a higher peak temperature in Mg sheet was reached than that in Ti sheet,and the rate of decline was also fast. As the wire feed speed increased,the peak temperature became higher and reached the molten temperature of titanium sheet,then the amount of molten Ti increased,finally sound Mg / Ti interface formed.

关 键 词：镁/钛异种金属 冷金属过渡 焊接温度场 数值模拟 

分 类 号：TG457[金属学及工艺—焊接]