焊缝返修焊接工艺研究与实践

Research and practice on the technology of repair welding

在对以往焊缝返修工作实践分析与总结的基础上,提出了锅炉压力容器焊缝返修焊接工艺设计方法和经验,具体包括坡口制备、焊接方法确定、焊接材料选择和预热、后热及焊后热处理工艺制定等方面。详细分析了返修焊接常见缺陷产生的原因及防止措施,指出返修焊缝焊接工艺评定理解误区和正确的评定方法。同时还介绍了焊缝返修焊接操作工艺要点。实践证明,这些对提高焊缝返修一次合格率,保证返修焊缝质量,具有明显成效,对同行业的焊缝返修具有一定借鉴作用。

According to the welding engineer experience of boiler and pressure vessel manufacturing for the years,basing on the analysis and summary of previous repair welding work practice,the design method of weld repair process is presented,including the preparation,welding method,welding material selection and formulation of preheating,heat and heat treatment after welding process.This paper analyzes the causes of common defects of repair welding and preventive measures and points out misunderstanding of the repair welding procedure qualification and correct evaluation method.It also introduces the repair welding operation process elements.It has been proved that all of these has obvious effect to improve repair welding qualification rate,to ensure repair weld quality and has certain reference function to repair welding of the same industry.