EH40大热输入钢双丝窄间隙MAG焊接头组织与性能  

Microstructure and mechanical properties of EH40 high-heat-input steel welded joint using double wires narrow gap MAG welding process

作　　者：胡奉雅 倪志达 林三宝[2] 付魁军 王佳骥 Hu Fengya;Ni Zhida;Lin Sanbao;Fu Kuijun;Wang Jiaji(State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114001,China;Harbin Institute of Technology,State Key Laboratory of Advanced Welding and Joining,Harbin 150001,China)

机构地区：[1]海洋装备用金属材料及应用国家重点实验室,辽宁鞍山114001 [2]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《焊接》2019年第9期39-43,48,I0022,共7页Welding & Joining

摘　　要：利用双丝窄间隙MAG焊对84 mm厚EH40大热输入钢进行对接试验,对焊接接头的组织与力学性能进行考察分析,研究结果表明,双丝窄间隙MAG焊工艺适用于厚板大热输入船板钢的焊接,焊缝成形良好,未见宏观缺陷。焊接接头热影响区组织主要为板条贝氏体、粒状贝氏体与针状铁素体组织。接头抗拉强度近520 MPa,接近母材强度;试样弯曲180°,受拉面未见明显裂纹,双丝窄间隙MAG焊工艺可以获得力学性能优良的厚板EH40大热输入钢的焊接接头。Using 84 mm high-heat-input welding steel EH40 as an example,the butt welding test was given by double wires narrow gap metal active gas arc welding(NG-MAG).The microstructure and mechanical properties of this welding joint were tested and analyzed.The results showed that the method was suitable for high-heat-input welding steel with large thickness.There were better weld quality and no macro defects.The microstructure of HAZ consisted of lath bainite,granular bainite and acicular ferrite.The tensile strength of the joint was nearly 520 MPa,which was close to that of the base metal.The sample was bent at 180°and no obvious crack was observed on the tensile surface.The welded joints of high-heat-input welding steel EH40 with superior mechanical properties could be obtained by double wires narrow gap MAG welding process.

关 键 词：窄间隙焊接 大热输入钢 接头组织 力学性能 

分 类 号：TG444[金属学及工艺—焊接]