焊缝凝固时的应力应变过程分析

ANALYSIS OF STRESS AND STRAIN DURING WELD SOLIDIFICATION

本文在二维情况下针对SUS 310S型奥氏体不锈钢焊接接头,利用非线性热弹塑性有限元分析方法建立了焊缝在凝固时所受应力应变的计算模型。计算结果表明:焊缝金属在凝固过程中受到横向拉伸应变的作用;起始端部所受的应变较大;离端部一定距离后的焊缝所受的应变基本上相同;焊缝金属凝固结束时受到的拉伸应变约为0.4％。

A two-dimensional model to simulate the strain and stress of weld metal during solidification is established with non-linear thermal elastic-plastic FEM for SUS 310 S austenitic weld. In this model the effects of melt latent heat on temperature distribution and solidification contract on the strain are considered, and the behaviour of weld deformation during solidification is thought over. The calculating results indicate that (1) the weld metal is subjected to transverse tensile strain, (2) the strain is larger at the beginning of weld and becomes constant at some distance from the beginning, (3) the strain is about 0.4％.