SMA490BW耐候钢深熔焊工艺及接头的组织和性能  

Study on the deep penetration welding procedure and microstructure,property of weather-resistant steel SMA490BW welded joints

作　　者：吴向阳 田仁勇 张志毅 李亚南 赵秩磊 丁成钢[2] WU Xiangyang;TIAN Renyong;ZHANG Zhiyi;LI Yanan;ZHAO Zhilei;DING Chenggang(Technical engineering dept.,CRRC Qingdao SiFang Co.,Ltd.,Qingdao 266111,China;Institute of Material Science and Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]中车青岛四方机车车辆股份有限公司技术工程部,山东青岛266111 [2]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《电焊机》2020年第10期65-69,I0006,共6页Electric Welding Machine

摘　　要：分别采用高频脉冲MAG焊和普通脉冲MAG焊(深熔模式)对12 mm厚SMA490BW耐候钢板T型接头(角焊缝)进行了焊接工艺试验,观察和分析了熔深及焊接接头的宏观形貌、金相组织特征,并测试了焊接接头的维氏硬度(HV10)和焊接残余应力。结果表明:与普通脉冲MAG焊相比,在相近的焊接线能量(热输入)下,高频脉冲的熔深增加20%~30%,焊接热影响区(距焊趾处约12 mm)的残余应力降低约为11%~26%;与普通脉冲MAG焊相比,高频脉冲MAG焊接头呈较为理想的组织特征,焊缝中针状铁素体(AF)组织含量较多,熔合区不含侧板条铁素体(FSP)组织,先共析铁素体(GBF)组织数量较少,其过热区的晶粒粗化程度较小;两种焊接方法获得的焊接接头的维氏硬度值均小于380 HV10,符合焊接工艺评定标准的要求。Using two welding processes,high-frequency pulse MAG welding and conventional pulse MAG welding,the welding process test was carried out on the 12 mm thick SMA490BW weather-resistant steel plate T-joint(fillet weld),the macroscopic,penetration and the microstructure of the welded joint were analyzed,and the Vickers hardness HV10 and welding residual stress of the welded joint were also tested.The results show that comparing to the ordinary pulse MAG welding at the similar welding heat input value,the penetration of highfrequency pulse MAG welding increases by 20%~30%,the residual stress at the HAZ(12 mm from weld toe)reduces by about 11%~26%,the high-frequency pulse MAG welded joint shows ideal microstructure characteristics,there is high content of acicular ferrite(AF)in weld,no ferrite side plate(FSP)and less content of grain boundary ferrite(GBF)in bond,and the grain coarseness of the grain coarsened zone(CGZ)is less.The vickers hardness HV10 value of the welded joint in two welding processes is less than 380 HV10,which meets the requirements of the welding procedure qualification standard.

关 键 词：SMA490BW耐候钢 高频脉冲MAG深熔焊 残余应力 显微组织 维氏硬度 

分 类 号：TG457.11[金属学及工艺—焊接]