铝薄板高速DP-GMAW焊接性能的研究  

High speed double pulse gas metal arc welding performance of aluminum sheet

作　　者：薛家祥[1] 黄雯锦 徐敏[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州市510641

出　　处：《焊接》2016年第5期1-4,73,共4页Welding & Joining

基　　金：广东省省部产学研项目(2013B090600098)

摘　　要：双脉冲熔化极气体保护焊(DP-GMAW)是对传统的熔化极气体保护焊(GMAW)的高频脉冲进行低频调制,是一种可实现高速焊接的高效焊接方法。论文以1070铝薄板为试验母材进行平板堆焊,通过与焊接速度0.6m/min下的焊接接头性能质量的对比,进行外观、显微维氏硬度试验和金相分析得出高速焊接接头性能质量。结果表明,高速DP-GMAW焊接接头没有出现高速焊接下常会出现的驼峰焊道;高速下焊缝周围低于母材硬度的区域变窄,宽度减少了约25%,焊缝硬度比焊接速度0.6 m/min下的焊缝硬度提高近30%;高速焊接的焊缝区晶粒更加细化,融合区晶粒长大的现象不明显。Double pulse gas metal arc welding( DP- GMAW) is a way to put high frequency pulse of traditional gas metal arc welding( GMAW) into low frequency modulation. It is an efficient method which can realize high speed welding. In this study,the 1070 aluminum sheet is taken as the base metal for the bead-on-plate traveling welding,compared with and the welded joint was compared with that at welding speed of 0. 6 m / min. The mechanical properties of welded joint at two different speeds were tested and compared from weld appearance,Victorinox Hardness and microstructure. It was found that humping bead does not appear in high-speed double pulse gas metal arc welding,and the zone width where the microhardness lower than that of the base material was reduced by about 25%. The hardness of the welded joint was increased by nearly 30% compared with that at the welding speed of 0. 6 m / min. The grains in weld are much finer and the growth of grains in the fusion zone is not obvious.

关 键 词：铝薄板 高速焊接 硬度 

分 类 号：TG406[金属学及工艺—焊接]