SUS304/Q235B双金属冶金复合螺旋管激光-CMT复合焊+埋弧焊接头组织及性能  

Microstructure and properties of welded joint of SUS304/Q235B bimetal metallurgical clad spiral pipe by laser-CMT hybrid welding and submerged arc welding

作　　者：席敏敏[1,2] 李中祥 黄胜 田磊 王强强[4] 姜帆 赵西岐 Xi Minmin;Li Zhongxiang;Huang Sheng;Tian Lei;Wang Qiangqiang;Jiang Fan;Zhao Xiqi(Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,Shaanxi,China;Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods,Baoji 721008,Shaanxi,China;Shanghai BSW Petroleum Steel Pipe Manufacturing Co.,Ltd,Shanghai 200941,China;No.1 Oil Production Plant of Changqing Oilfield Company,Yan’an 716009,Shaanxi,China)

机构地区：[1]宝鸡石油钢管有限责任公司,陕西宝鸡721008 [2]国家石油天然气管材工程技术研究中心,陕西宝鸡721008 [3]上海宝世威石油钢管制造有限公司,上海200941 [4]长庆油田公司第一采油厂,陕西延安716099

出　　处：《焊接》2022年第12期6-12,共7页Welding & Joining

基　　金：陕西省科技统筹创新工程计划课题(2014KTDZ01-03-02)。

摘　　要：采用激光-CMT复合焊+埋弧焊的焊接工艺对SUS304/Q235B双金属冶金复合螺旋管进行了生产试制,利用OM,EDS研究了复合管焊缝微观组织特征及合金元素分布,同时检验了焊接接头的力学性能和耐腐蚀性能。结果表明,焊缝合金成分合理,合金元素稀释率低。内焊焊缝(CMT区域)微观组织为奥氏体+铁素体+碳化物析出相,内焊焊缝(LBW区域)微观组织为奥氏体+铁素体+马氏体,Q235B基层焊缝微观组织为铁素体+珠光体;焊接接头抗拉强度平均值为451 MPa,-10℃下焊缝及热影响区的冲击吸收能量平均值分别为167 J和236 J,焊接接头面弯、背弯180°拉伸面无裂纹(弯轴直径45 mm),焊缝硬度最高值为285 HV10;晶间腐蚀试验后,管体与焊缝弯曲180°拉伸面无裂纹(弯轴直径4 mm)。SUS304/Q235B双金属冶金复合螺旋管激光-CMT复合焊+埋弧焊接头的各项性能均符合相关标准的要求,能够满足饮用水输送工程的应用需求。Trial production of SUS304/Q235B bimetal metallurgical clad spiral pipe were carried out by welding process of laser-CMT hybrid welding and submerged arc welding. Characteristics of microstructure and alloy element distribution of welded joints of the clad pipe were studied by OM and EDS, and mechanical properties and corrosion resistance of welded joints were also tested. The results showed that alloy composition of weld was reasonable and dilution rate of alloy element was low. Microstructure of the internal weld(CMT area) was austenite, ferrite and carbide precipitates, that of the internal weld(LBW area) was austenite, ferrite and martensite, and that of Q235B base weld was ferrite and pearlite. Average tensile strength of welded joints was 451 MPa, and average impact absorbed energy of weld and heat affected zone at-10 ℃ was 167 J and 236 J, respectively. There was no crack on the tensile surface of 180° forward and back bending of welded joints(bending shaft diameter was 45 mm). The maximum hardness of weld was 285 HV10. After intergranular corrosion test, there was no crack on the tensile surface of 180° bending of pipe body and weld(bending shaft diameter was 4 mm). Weld joints of SUS304/Q235B bimetal metallurgical clad spiral pipe by laser-CMT hybrid welding and submerged arc welding met requirements of relevant standards and application requirements of drinking water delivery engineering.

关 键 词：激光-CMT复合焊 SUS304/Q235B 双金属冶金复合螺旋管 微观组织 晶间腐蚀 

分 类 号：TG456[金属学及工艺—焊接]