焊接工艺措施对L555M管道环焊接头性能的影响  

Effect of welding process measures on mechanical properties of L555M pipe girth welded joint

作　　者：隋永莉 孙哲 徐维章 冯大勇 Sui Yongli;Sun Zhe;Xu Weizhang;Feng Dayong(China Petroleum Pipeline Research Institute Co.,Ltd.,National Engineering Laboratory for Pipeline Safety,Langfang 065001,Hebei,China;No.1 Branch Company of China Petroleum Pipeline Engineering Co.,Ltd.,Langfang 065001,Hebei,China;Gas Branch Company of China Petroleum Pipeline Engineering Co.,Ltd.,Langfang 065001,Hebei,China)

机构地区：[1]中国石油天然气管道科学研究院,油气管道输送安全国家工程实验室,河北廊坊065001 [2]中国石油管道局工程有限公司第一分公司,河北廊坊065001 [3]中国石油管道局工程有限公司燃气分公司,河北廊坊065001

出　　处：《焊接》2021年第6期40-47,63,64,共10页Welding & Joining

基　　金：国家重点研发计划资助项目(2016YFC0802301);中国石油天然气集团有限公司科技研究与技术开发项目(2018B-3007)。

摘　　要：文中通过研究预热温度、道间温度和焊道数量对环焊接头拉伸强度、弯曲性能、低温冲击韧性和显微组织影响的影响,发现预热、道间温度和多层多道焊等工艺措施可不同程度地改善焊缝金属和热影响的组织,防止晶粒粗大,从而提高环焊接头的弯曲性能和低温冲击韧性。同时,预热温度、道间温度和不同壁厚的最佳焊道数量等工艺措施有其合理范围,应通过焊接工艺评定来确定,才能有效保证环焊接头综合力学性能的稳定性。In this paper,through the research on the effect of FCAW welding process measures,such as preheating temperature,inter-pass temperature and girth weld pass number,it was found that welding process measures such as preheating,inter-pass temperature and multi-layer and multi-pass welding were adopted to improve the microstructure of weld and heat affected zone and prevent coarse grains,and then to improve bending performance and low temperature impact toughness of girth welded joints.At the same time,there was a reasonable range of preheating temperature,inter-pass temperature and the optimal number of weld passes with different wall thicknesses,which should be determined through welding process qualification to ensure the stability of the comprehensive mechanical properties of girth welded joint.

关 键 词：L555M管道 环焊接头 焊接工艺 预热 道间温度 

分 类 号：TG454[金属学及工艺—焊接]