焊管2023，Vol.46Issue(12)：40-46,7.DOI:10.19291/j.cnki.1001-3938.2023.12.007
天然气场站用1Cr18Ni9Ti管道全自动横焊接头组织与性能
Microstructure and Mechanical Properties of Automatic Tungsten Inert Gas Welding Joint of 1Cr18Ni9Ti Stainless Steel
摘要
Abstract
In order to improve welding efficiency and quality,automatic tungsten inert gas welding was used to conduct transverse welding tests on 1Cr18Ni9Ti pipelines used in natural gas stations.The microstructure of the welded joints was observed using optical microscopy(OM),scanning electron microscopy(SEM),and backscattered electron diffraction(EBSD),and mechanical properties such as tensile,bending,hardness,and impact were measured.The results show that the root weld of the joint is mainly composed of equiaxed austenite,while the filling cover weld is mainly composed of columnar austenite.The proportion of grain boundaries greater than 15 ° in the weld is 67.816%,and the orientation difference of grain boundaries is mostly between 40° and 45°.The tensile strength of the welded joints is higher than 710 MPa,and there are no cracks in both the transverse side bend and transverse face bend specimens.The impact energy of both the weld and HAZ is higher than 100 J,and the hardness is lower than 190HV10.Pitting test results indicate that it is not suitable for long term use in high chloride ion environments.The 1Cr18Ni9Ti pipeline used in the natural gas station can be welded at horizontal position 2G by automatic tungsten inert gas welding.The mechanical properties of the welded joints meet relevant standards and production requirements.关键词
1Cr18Ni9Ti奥氏体不锈钢/全自动钨极氩弧焊/显微组织/力学性能Key words
1Cr18Ni9Ti austenitic stainless steel/automatic tungsten inert gas welding/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
丰帆,马明,高彦伟,叶陈峣,李立英,韩彬..天然气场站用1Cr18Ni9Ti管道全自动横焊接头组织与性能[J].焊管,2023,46(12):40-46,7.基金项目
国家重点研发计划"基于小样本学习深度神经网络的油气管道第三方入侵预警技术研究"(项目编号2021YFA1000103) （项目编号2021YFA1000103）
山东省重点研发计划"长输管线智能化焊接和检测系统关键技术研究及装备开发"(项目编号2022CXGC010202) （项目编号2022CXGC010202）
山东省重点研发计划"面向国家重点工程和特种行业的焊接及增材智能机器人关键技术研究与产业化"(项目编号2020CXGC010207). （项目编号2020CXGC010207）
