背保护工艺对EH油管接头性能的影响  

Effect of back protection process on EH oil pipe joint performance

作　　者：王云龙 范伟 闫占印 张林 WANG Yunlong;FAN Wei;YAN Zhanyin;ZHANG Lin(China Railway 12th Bureau Group Construction and Installation Engineering Co.Ltd.,Taiyuan 030021,China;China Railway 12th Bureau Group Co.Ltd.,Taiyuan 030021,China;School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]中铁十二局集团建筑安装工程有限公司,山西太原030021 [2]中铁十二局集团有限公司,山西太原030021 [3]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《兵器材料科学与工程》2022年第2期119-123,共5页Ordnance Material Science and Engineering

摘　　要：用无保护、免充氩保护剂与充氩保护焊接0Cr18Ni9奥氏体不锈钢EH油管,通过光学显微镜(OM)、拉伸试验、弯曲试验,采用同种氩弧焊焊接工艺,研究不同背保护下的0Cr18Ni9奥氏体不锈钢EH油管焊接接头组织及性能。结果表明:不同背保护下0Cr18Ni9不锈钢管接头焊缝区组织均为奥氏体+δ-铁素体,无背保护时,δ-铁素体以骨骼状存在,体积分数为11.45%;用免充氩保护与背部充氩时,焊缝区出现蠕虫状δ-铁素体,同时组织细化,体积分数变为15.04%、16.67%。当充氩保护焊接时,EH油管焊接接头背部焊缝质量与力学性能最优,抗拉强度为649.5 MPa。The 0 Cr18 Ni9 austenitic stainless steel EH tubing was welded with non-protected,argon-free protective agent and argon-filled protection. The microstructure and properties of 0 Cr18 Ni9 austenitic stainless steel EH tubing welded joints under differentback protection methods were studied by optical microscope(OM),tensile test and bending test using the same argon arc weldingprocess. The results show that the weld zone structure of 0 Cr18 Ni9 stainless steel pipe joints under different back protection methodsis austenite+δ-ferrite. Without back protection,δ-ferrite exists as skeleton,and its volume fraction is 11.45%. When argon-freeprotection and back argon charging are adopted,worm-like δ-ferrite appears in the weld zone,the microstructure refines,and thevolume fraction are 15.04% and 16.67%,respectively. When argon-filled protection welding is used,the quality and mechanicalproperties of the back weld of EH tubing welded joint are the best,and the tensile strength is 649.5 MPa.

关 键 词：EH油管 背部保护方式 背部焊缝宏观质量 力学性能 

分 类 号：TG444[金属学及工艺—焊接]