5083铝合金等离子-MIG焊接接头组织和力学性能  

Microstructure and mechanical properties of 5083 aluminum alloy welded joint by plasma-MIG welding

作　　者：王雪[1] 梁志敏[1] 蔡得涛 韩善果 

机构地区：[1]河北科技大学材料科学与工程学院,石家庄050018 [2]广东省焊接技术研究所(广东省中乌研究院),广州510650

出　　处：《焊接》2017年第12期28-31,共4页Welding & Joining

基　　金：广东省科技项目(2015B050502007);广东省科技项目(2012A061400011);广东省创新团队项目(201101C0104901263)

摘　　要：采用同轴式等离子-MIG焊工艺对5 mm厚5083铝合金试板进行对接试验,并对接头的组织和力学性能进行研究。结果表明,焊缝均为等轴晶组织,但晶粒大小分布不均匀,在熔合线边缘和焊缝中心出现细晶区,焊缝中心两侧和上下表面附近晶粒尺寸较大,部分熔化区宽度较大;焊缝区和热影响区显微硬度低于母材,焊缝最低硬度值为78 HV,约为母材硬度的85%;接头横向抗拉强度平均值为277 MPa,断后伸长率为7.34%,断裂位置在熔合线附近。Microstructures and mechanical properties of welded joint of 5083 aluminum alloy plate with 5 mm in thickness by plasma-MIG plant welding were studied. The results showed that equiaxed grains distribute in weld seam zone,and their sizes distribute uniformly. Fine equiaxed grains appear in the fusion boundary zone and weld center. The grain sizes on both sides of the weld and near the upper and lower surfaces are larger. The width of PMZ( Part of the melting zone) is larger. Micro-hardness value in the weld seam zone and the heat affected zone is less than that of the base metal,and the minimum hardness value of the weld is 78 HV,which is about 85% of that of the base metal. The tensile strength of the test plate is about 277 MPa,and the elongation is 7. 34%. The fracture is located near the fusion line.

关 键 词：5083铝合 金等离子-MIG焊组 织 力学性能 

分 类 号：TG406[金属学及工艺—焊接]