球墨铸铁与钢的磁控旋转电弧焊接  

Magnetically Impelled Arc Butt Welding of Ductile Iron and Steel

作　　者：杨蕾 刘畅 杜金红 高峰 彭铭建 刘红兵 YANG Lei;LIU Chang;DU Jinhong;GAO Feng;PENG Mingjian;LIU Hongbing(Yangzhou Dongsheng Auto Parts Co.,Ltd.,Yangzhou 211403,Jiangsu China;Y angzhou Polytechnic College,Yangzhou 225126,Jiangsu China;School of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]扬州东升汽车零部件股份有限公司,江苏扬州211403 [2]扬州职业大学,江苏扬州225126 [3]上海工程技术大学材料工程学院,上海201620

出　　处：《热处理》2022年第3期18-22,26,共6页Heat Treatment

基　　金：江苏省科技成果转化专项资金项目(BA2020068);浙江省重点研发计划资助项目(2021C01085)。

摘　　要：汽车稳定杆可以球墨铸铁管和合金钢管作原材料采用焊接工艺制造,但由于两种材料化学成分差异较大,焊接困难。采用磁控旋转电弧焊工艺对6 mm厚的GGG40球墨铸铁管和E355合金钢管进行了对接焊,随后对焊接接头进行了宏观检验、金相检验、拉伸试验、断口分析、显微硬度测定和疲劳试验。结果表明:焊缝组织较细小,球墨铸铁侧组织与母材有较大差异;接头的平均抗拉强度为361.4 MPa,为母材强度的90.3%,最高硬度远高于母材,为402.6 HV0.1;采用MIABW工艺焊接的球墨铸铁-合金钢汽车稳定杆疲劳试验1 290次循环未发生断裂。Automobile stabilizing rod may be fabricated by using ductile iron pipe and alloy steel pipe as raw materials by welding technology, however, it is difficult to weld such materials due to the large differences in their chemical composition. A 6-mm-thick GGG40 ductile iron pipe was welded on a 6-mm-thick E355 steel pipe by a magnetically impelled arc butt welding(MIABW) technology. After this, the welded joint was subjected to macro check, metallographic examination, tensile test, fracture testing, micro-hardness measurements and fatigue test. The results showed that(a) the welding seam exhibited finer structure, the ductile iron side differed more obviously from the base metal in microstructure;(b)the welded joint given an average tensile strength of 361.4 MPa which was 90.3% of that of the base metal, and the highest microhardness of 402.6 HV0.1 which was much higher than the base metal;and(d) an automobile stabilizing rod fabricated by welding the ductile iron pipe on the alloy steel pipe with MIABW technology was fatigue tested 1 290 cycles without cracking.

关 键 词：磁控旋转电弧焊(MIABW) GGG40球铁 E355钢 力学性能 稳定杆 

分 类 号：TG444[金属学及工艺—焊接]