钛合金焊接过程应力应变特点分析  

Investigation on welding stress and strain of titanium alloy

作　　者：李菊[1] 关桥[1] 史耀武[2] 

机构地区：[1]北京航空制造工程研究所,北京100024 [2]北京工业大学材料学院,北京100022

出　　处：《焊接学报》2010年第3期53-56,60,共5页Transactions of The China Welding Institution

基　　金：航空基金资助项目(05H25014)

摘　　要：采用有限元分析和试验测试相结合的方法对钛合金薄板钨极氩弧焊的焊接应力应变进行分析.结果表明,在焊接不均匀加热和冷却的综合过程中,熔池金属是在周边已经产生了压缩塑性应变的框架内熔化,并在已经发生了压缩塑性应变的近缝区框架内冷却.焊缝冷却过程中,在"力学熔化"区间,有拉伸塑性应变的卸载过程,但残余状态仍保留了压缩塑性应变.焊缝在冷却、凝固降温过程中,其纵向拉应力的峰值始终低于材料在相应温度下的屈服强度,直至残余状态.The welding stress and strain were investigated using the finite element method combined with the experiments. The research results showed that the metal in the melting pool is melted in the frame of area with compressive plastic strain, and cooled down also in the frame of the area with compressive plastic strain. The tensile plastic strain is produced in the weld when it is in the state of ‘mechanical melting’ during the cooling process. But in the residual state, the compressive plastic strain still remains in the weld. The peak value of longitudinal tensile stress in the weld of titanium alloy is always lower than its yield strength at the appropriate temperature during the cooling process, this situation is kept until the residual state.

关 键 词：钛合金 焊接 应力 应变 

分 类 号：TG404[金属学及工艺—焊接]