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简要介绍了残余应力的分类及其产生原因。分析了焊接残余应力对管道疲劳寿命和断裂能力的不利影响。焊后塑性变形也可能与焊接残余应力交互影响整个壁厚层和管子周向最终残余应力的大小和分布状态。借助计算焊接力学(CWM)能够更准确地估算由焊接产生的残余应力和变形,其结果可用于优化和确定管道的结构寿命,分析结果还能有效评估塑性变形对焊接残余应力的影响。通过两个焊接实例验证了焊接残余应力及焊后塑性变形对焊管最终残余应力大小和分布的影响。
The classification of residual stress and its causes are briefly introduced. The adverse effects of welding residual stress on fatigue life and fracture capacity of pipelines were analyzed. Post-weld plastic deformation may also interact with weld residual stress to influence the size and distribution of the final residual stresses throughout the wall thickness and tube circumference. With the help of CWM, the residual stress and deformation caused by welding can be more accurately estimated. The results can be used to optimize and determine the structural life of the pipeline. The results of the analysis can also effectively evaluate the effect of plastic deformation on the welding residual stress. The effects of welding residual stress and post-weld plastic deformation on the final residual stress of welded pipe were verified by two welding examples.