船用中厚板EH36多层多道焊接的残余应力研究  

Study on the residual stress of multi-layer and multi-pass welding for medium plate EH36

作　　者：吴俊峰[1] 王匀[1] 王诚强 朱凯[1] 许桢英[1] 殷苏民[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《电焊机》2014年第7期94-97,共4页Electric Welding Machine

基　　金：国家自然科学基金资助项目(51179076);江苏省"333工程"科研资助项目(BRA2011180);江苏省光子制造重点实验室基金资助项目(GZ201104);数字化制造技术省高校重点建设实验室基金资助项目(HGDML-1002)

摘　　要：为探索EH36焊接区域的应力场分布机理,基于热弹塑性理论和热-结构耦合方法,考虑焊接温度场对残余应力场的影响,对船用高强度钢EH36多道焊进行了数值计算和试验验证。结果表明:焊接冷却时,焊缝区域受到拉伸应力而产生纵向最大拉应力为364 MPa,并很快过渡到压应力;焊缝两端承受的横向最大压应力为320 MPa,中间拉应力变化幅值少于20 MPa;通过X射线衍射测量焊件表面残余应力,测量结果与模拟结果吻合,说明上述分析方法对于EH36焊接工艺设计优化具有较好的指导作用。In order to explore the mechanism of residual stress distribution of EH36 welding area, the nmltipass welding of the Marine high strength steel EH36 was made by numerical calculation and test verification.Based on the thermal elasto-plastic theory and the thermo-structural coupling method,the paper considered the effects of welding temperature field on residual stress field. The results show that when the welding is cooling,the weld zone produces maximum longitudinal tension stress 364 MPa because the weld zone is under tension stress and tension stress quickly transit to compression stress.Two sides of the weld zone produce maxinmm transverse compression stress 320 MPa and the amplitude of the variation in the center of weld zone is less than 20 MPa.The Stress measurement of the weldment was made by using the X-ray diffraction method and measurement results were in agreement with the calculated resuhs.It indicated that this analysis method has a nice guiding role in design and optimization of EH36 welding process.

关 键 词：热-结构耦合 残余应力 多层多道焊 数值分析 

分 类 号：TG404[金属学及工艺—焊接]