压力容器2025，Vol.42Issue(8)：24-33,10.DOI:10.3969/j.issn.1001-4837.2025.08.004
激光-电弧复合焊在X80管线钢打底焊上的应用
Application of laser-arc hybrid welding for root welding of X80 pipeline steel
ZHOU Cong 1WANG Changjiang 1WANG Feng 1LUAN Chenjie 1WANG Hehe1
作者信息
- 1. PipeChina Engineering Technology Innovation Co.,Ltd.,Tianjin 300450,China
- 折叠
摘要
Abstract
To address the issues of low efficiency and unstable quality in manual and semi-automatic welding of long-distance oil and gas pipelines,the laser-arc hybrid welding process(root welding with laser+filling and capping with gas metal arc welding)for X80 grade pipeline steel was studied.This process adopts a design with large blunt edge(6 mm thick)and narrow groove,which saves welding materials,improves welding efficiency,and enables all-position single-sided welding with back formation.The welded joint was examined using optical microscopy,and tensile,bending,Charpy impact,microhardness,CTOD,and EBSD tests were conducted to analyze the joint from both welding process and microstructure perspectives.The results show that the welded joint has good formation,with an average low-temperature impact energy at-10℃exceeding 116 J,hardness below 270HV10,average CTOD value of 0.354 mm for the weld,and 0.640 mm for the heat-affected zone.The microstructure of the root weld primarily consists of martensite,granular bainite,and lath bainite,while the coarse-grained zone of the heat-affected zone mainly comprises ferrite,martensite,and granular bainite.Low-temperature impact and CTOD tests of the laser-arc hybrid root welding region indicate that its low-temperature toughness is lower than that of the gas metal arc welding region.This study provides technical support for the application of laser-arc hybrid welding technology in oil and gas pipeline welding.关键词
X80钢/激光-电弧复合焊/大钝边/组织性能/低温韧性Key words
X80 steel/laser-arc hybrid welding/large blunt edge/microstructure and properties/low-temperature toughness分类
机械制造引用本文复制引用
ZHOU Cong,WANG Changjiang,WANG Feng,LUAN Chenjie,WANG Hehe..激光-电弧复合焊在X80管线钢打底焊上的应用[J].压力容器,2025,42(8):24-33,10.
