目的 在FCAW-G自动焊工艺组织及性能研究基础上,探讨自动焊在B型套筒修复过程中的适用性。方法 采用壁厚36 mm的Q345套筒对外径1 016 mm、壁厚17.5 mm的X70主管道进行FCAW-G自动焊修复,通过现场焊接工艺模拟试验及组织性能分析,对FCAW-G自动焊的工艺参数进行了优化。结果 当垫层焊接热输入为1.0~1.5 kJ/mm、填充焊接热输入为1.5~2.0 kJ/mm时,焊接成形良好,未出现氢致开裂和烧穿的现象;对接焊缝根焊道、填充焊道、盖面焊道微观组织为针状铁素体+粒状贝氏体+少量先共析铁素体,焊缝金属与两侧母材熔合良好;对焊接接头进行了无损检测及力学性能试验,试验结果均符合国家标准要求。结论 FCAW-G自动焊工艺可用于在役管道的B型套筒修复,焊缝质量符合国内标准验收要求,实现了焊接质量和焊接效率的明显提升,推动了自动焊技术在国内高钢级、大口径天然气管道B型套筒在役焊接中的应用。
Abstract
Based on the study of the microstructure and properties in the FCAW-G automatic welding process, the work aims to explore the applicability of automatic welding in the repair process of type B sleeves. FCAW-G automatic welding repair was performed on an X70 main pipeline with an outer diameter of 1 016 mm and a wall thickness of 17.5 mm by a Q345 sleeve with a wall thickness of 36 mm. Then, the process parameters of FCAW-G automatic welding were optimized through on-site welding process simulation tests and microstructural property analysis. When the heat input of the pad was 1.0-1.5 kJ/mm, and the heat input of the filler was 1.5-2.0 kJ/mm, the welding forming was good, and no hydrogen cracking and burn-through occurred. Meanwhile, the microstructure of the root weld bead, filler weld bead and cover weld bead of the butt weld was ferrite+granular bainite+a small amount of proeutectoid ferrite, and the weld metal was well fused with the base metals on both sides. Then, non-destructive test and mechanical property test were carried out on the welded joints and the test results met the requirements of the national standards. The FCAW-G automatic welding process can be applied to type B sleeve repairs for in-service pipelines. The weld quality meets Chinese standard acceptance requirements, achieving significant improvements in both welding quality and efficiency. This advancement promotes the application of automatic welding technology in type B sleeve repairs for in-service, high-grade steel, large-diameter natural gas pipelines within China.
关键词
在役管道 /
套筒修复 /
气体保护药芯焊丝 /
自动焊 /
焊接热输入
Key words
in-service pipeline /
sleeve repair /
gas shielded flux-cored wire /
automatic welding /
heat input
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