低强匹配对接接头焊接残余应力的数值模拟分析  

Numerical Simulation Analysis for the Welding Residual Stress of Low Strength Match Butt Joints

作　　者：万松林[1] 吴松林[2] 

机构地区：[1]海军驻上海江南造船(集团)有限责任公司军事代表室,上海201913 [2]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《材料开发与应用》2015年第1期33-37,共5页Development and Application of Materials

摘　　要：本文采用数值模拟方法,分析了低强匹配对接接头2种拘束条件、5种屈服强度匹配系数的焊接残余应力。结果表明,低强匹配接头焊根处的三向残余拉应力较小,对静载强度影响不大;焊趾处的三向残余拉应力较大,对疲劳强度和冷裂倾向有不利影响。自由状态的纵向残余应力和两端约束状态的横向残余应力,焊缝金属屈服强度每降低25MPa,其残余应力减少约11MPa。Numerical simulation method was used to analyze the welding residual stress of low strength match butt joint under the condition of two constraint conditions and five yield strength match factors. The results show that the three-way residual tensile stress of low strength match joints at the weld root is small and has little influence on static load strength. The three-way residual tensile stress at the weld toe is large and has adverse influence on fatigue strength and cold crack performance. When yield strength of weld metal decrease every 25MPa,the longitudinal residual stress of free state and transversal residual stress of constrained state will reduce by about 11MPa.

关 键 词：低强匹配 焊接残余应力 屈服强度匹配系数 数值模拟 

分 类 号：TG457[金属学及工艺—焊接]