焊接结构和顺序对焊接残余应力影响研究
The study of the welding structure’s and welding sequence’s effect on welding residual stress
廖孟安，荣冉升
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作者单位：长沙中联重工科技发展股份有限公司
中文关键字：有限元；焊接结构；焊接顺序；残余应力
英文关键字：finite element; welding structure; welding sequence; welding residual stress
中文摘要：本文采用有限元软件MSC.Marc对使用高强钢制造的工程机械常用局部加强贴板焊接结构的进行焊接残余应力数值模拟计算分析。文中分别对四种不同结构和焊接顺序进行计算，对比分析结果表明：结构拘束和焊接顺序对焊接残余应力有重要影响，局部加强贴板增加结构拘束度，导致焊接残余应力增大；先焊主结构，再焊局部加强贴板，焊接残余应力最大。因此，合适地设计焊接结构和焊接顺序有利于降低结构的焊接残余应力，提高焊接结构的可靠性。
英文摘要：This paper studies on welding residual stress of welding joints between high-strength steel beams and its supporting bar which be widely used in engineering machine, by finite element software MSC.Marc. Through the studies of four different joints structure as well as welding sequence, it concludes that the addition constrains and welding sequence has great influence on residual stress. When intensifing constrains on the supporting bar, it shows increasing of welding residual stress. While welding the steel beams first and then welding the supporting bar, it gained the most welding residual stress. Consequently, a rational design of welding structure and advisable welding sequence can lower welding residual stress and boost security of welding structure.