The port stubs are larger welding parts of stainless steel plate, featuring with complicated structure and big overall dimensions contain complex local flanging shape and demand high forming quality. It is very important to forecast the welding stress and control the welding residual deformation exactly to ensure the safe reliability of the structure. In this paper, the welding distortions of port stub were predicted by inherent strain method and the welding sequence and clamping design were optimized. Three possible welding constraints and three welding sequence schemes of the port stub were provided within the actual processing condition, weld distortions were studied. Finally, the smallest welding deformation was under welding constraints 3, welding sequence 1, and the maximum welding deformation was 2.968 mm. The simulations were used to guide the manufacture of the final sequence and clamping design of the port stubs.

端口短管是不锈钢板的较大焊接零件，具有结构复杂，整体尺寸大，局部折边形状复杂，要求高成型质量的特点。准确预测焊接应力并控制焊接残余变形对确保结构的安全可靠性非常重要。本文通过固有应变方法预测了端口短管的焊接变形，并优化了焊接顺序和夹紧设计。在实际加工条件下，给出了三种可能的焊接约束条件和三种焊接顺序方案，研究了焊接变形。最后，最小焊接变形在焊接约束3，焊接顺序1下，最大焊接变形为2.968 mm。