摘要
利用ABAQUS有限元软件对镁/钢异种金属激光焊进行数值模拟,研究焊接过程中温度场及应力场的分布规律,对比分析模拟结果与试验结果并进行验证,从热传递角度分析添加镍箔中间层对镁钢搭接激光焊的影响,对其进行温度场和应力场模拟。结果表明:模拟结果与镁钢激光焊的试验结果较为吻合,镍中间层减缓了钢侧向镁侧的热传递,使镁侧温度梯度减小;应力场模拟结果表明钢侧与焊缝中心线上的残余应力以拉应力为主,垂直于焊缝方向,钢侧与镁侧焊缝及热影响区域的残余应力以拉应力为主;在远离焊缝区域逐渐从拉应力转变为压应力,镁侧的应力转变趋势比钢侧较为缓和;在添加镍箔后,镁侧焊缝整体残余应力集中情况明显改善,应力过渡趋势减缓。
The numerical simulation of laser welding of magnesium and steel dissimilar metals was carried out by using finite element software ABAQUS, the temperature field and stress field in the welding process were investigated, and the simulation results and experimental results were compared and verified. The influence of adding nickel foil inter-layer on the laser lap welding of magnesium and steel was analyzed from the perspective of heat transfer, and the temperature field and stress field were simulated. The results show that the simulation results are in good agreement with the experimental results of laser welding of magnesium and steel dissimilar metals, the nickel inter-layer slows down the heat transfer form steel side to magnesium side, and reduces the temperature gradient of magnesium side. The simulation results of stress field show that the residual stress of steel side and weld center-line is mainly tensile stress, perpendicular to the weld direction, and the residual stress of the weld of steel side and magnesium side and the heat affected zone is mainly tensile stress. In the region far away from the weld, the tensile stress gradually changes to the compressive stress, and the stress transformation trend of the magnesium side is more smooth than that of the steel side. After adding nickel foil, the overall residual stress concentration of the magnesium side weld is obviously improved, and the stress transition trend is slowed down.
作者
王正天
江淑园
陈益平
熊震宇
胡德安
程东海
WANG Zheng-tian;JIANG Shu-yuan;CHEN Yi-ping;XIONG Zhen-yu;HU De-an;CHENG Dong-hai(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2021年第7期134-141,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51965045)。
关键词
激光焊
ABAQUS软件
数值模拟
温度场
应力场
laser welding
ABAQUS software
numerical simulation
temperature field
stress field
