T型接头随焊激冷数值模拟

Numerical simulation of T-joint of welding with trailing cooling

针对焊接结构残余应力及变形的问题进行了常规焊接和随焊激冷焊接的数值仿真,分析了随焊激冷法在T型焊接接头上对焊接温度场、应力场及变形的影响。结果表明,与常规焊接相比,随焊激冷的应用能在焊接冷源处形成温度区域低谷,减小高温作用范围与时间;随焊激冷对残余应力的影响主要集中在焊缝附近区域,能够降低焊接结构的最大残余应力;常规焊接最大变形量2.89 mm,随焊激冷焊接最大变形量为2.06 mm,能够降低残余变形。

For the problems of residual stress and deformation of welding structure,the numerical simulations of conventional welding and welding with trailing cooling are carried out to analyze the influence of the welding with trailing cooling method on the tempe-rature field,stress field and deformation of T-joints.The results show that comparing with conventional welding,the application of welding with trailing cooling can forms the temperature trough at the welding cold source and reduces the range and time of high temperature action.The effect of welding with trailing cooling on residual stress is mainly concentrated in the area near the weld,which can reduce the maximum residual stress of the welding structure.The maximum welding deformation is 2.89 mm for conven-tional welding and 2.06 mm for welding with trailing cooling.Thus,the residual deformation can be reduced by the method of welding with trailing cooling.