连续管焊接应力数值模拟分析

连续管的焊接应力对其质量与寿命有着重要影响。借助SYSWELD软件,依据连续管的材料性能,考虑焊接电弧力及其挖掘作用,选择双椭球形的热源模型,模拟连续管焊接过程,分析其焊接温度场及应力场。分析结果表明,焊缝处焊接残余应力不是均匀分布的,横向残余应力最大值出现在偏内径处,管的内外壁均受拉应力,且内径处比外径处大。纵向残余应力最大值出现在过热区,远离过热区的残余应力逐渐减小,而且逐渐由拉应力转变为压应力。

Numerical Simulation Analysis of Welding Stress of CT

The welding stress of coiled tubing(CT) has an important effect on its quality and service life.Based on the SYSWELD software the twin ellipse heat source model was selected to simulate the welding process of CT and analyze its welding temperature field and stress field referring to the material property of CT and considering the welding arc force and its digging action.The analysis shows that the welding residual stress is not evenly distributed at the welding seam.The maximum value of the horizontal residual stress appears at the eccentric diameter.The internal and external walls of tubing are subject to tensile stress and the internal diameter is greater than the outside diameter.The maximum value of the longitudinal residual stress appears at the overheated zone.The residual stress which is far away from the overheated zone gradually becomes less and it changes gradually from tensile stress to compressive stress.