7075铝合金电动自行车车架GTAW焊接过程温度场的三维有限元分析及工艺优化  

3-D Finite Element Analysis of Temperature Field and Process Optimization in GTAW Welded 7075 Aluminum Alloy Electric Bicycle Frame

作　　者：易传佩[1] 

机构地区：[1]湖南机电职业技术学院,湖南长沙410151

出　　处：《热加工工艺》2013年第15期180-182,186,共4页Hot Working Technology

摘　　要：采用焊接专用有限元分析软件对7075高强铝合金电动自行车车架GTAW焊接过程进行数值仿真,分析不同热输入条件下的温度场分布和熔池形态,探索其最优热源参数。结果表明:在最优热源参数下,达到准稳态时的熔池长度为10 mm,熔宽为6 mm,熔池最高温度不超过1100℃。此外,分析了最优热源参数下的焊接热循环特性。研究结果可为下一步预测焊接变形和残余应力的分布提供热学方面的理论借鉴。The welding process of GTAW welded 7075 high strength aluminum alloy electric bicycle t^ame was numerical simulated by special welding finite element analysis soitware. The temperature distribution and morphology of molten pool under different heat input conditions were analyzed, and the optimal heat source parameters was explored. The results show that： the length of molten pool at quasi-steady under optimum heat source parameters ,the corresponding weld width is 6mm, and the maximum temperature of molten pool can exceed 1100 ＊C. In addition, the heat cycle characteristics under optimum heat source parameters were analyzed. The results can provide thermal theory help for further prediction of welding deformation and residual stress distribution.

关 键 词：7075铝合金 钨极氩弧焊 温度场分布 有限元分析 

分 类 号：TG404[金属学及工艺—焊接]