一种消除小直径管道焊接应力技术的数值分析

小直径管道的应力腐蚀问题一直是工程界较难解决的问题，作者针对这一难题，提出了一种新型的消除应力方法——温差形变处理技术。利用MSC．Marc大型通用非线性有限元分析软件，对小直径管道环缝焊接接头的原始残余应力及温差形变法消除残余应力进行了有限元模拟，得到了一系列关于加热位置、加热宽度和加热持续时间的数据和规律。结果表明，采用温差形变处理技术，在内外表面的焊缝处都可以得到零值左右的残余应力，从而为进一步的试验分析工作和工程应用奠定了基础。

Numerical analysis of a method for relieving welding stresses of girth-weld pipes with small diameters

The stress corrosion crack of small diameter steel pipe girth welds has been an engineering puzzle for a long time.This paper presents a new method for relieving stresses - deformation method by temperature difference.By using general-purpose nonlinear finite element analysis software MSC.Marc,finite element modeling of original residual stress distributions in small diameter steel pipe girth welds and the relief of residual stresses by temperature difference are discussed in this.A serial of numerical analysis data and related rules about heating position,heating band width and heating time,are showed here.It shows that,by using this new method,residual stresses are decreased nearly to zero both on the inner surface and the outer surface of weld.