多次焊补对高速列车铝合金焊接接头的影响  

Influence of several times welding reworking on aluminum alloy welding joints for high speed train

作　　者：于金朋[1,2] 张立民[1] 张卫华[1] 陈辉[1] 马纪军 

机构地区：[1]西南交通大学牵引动力国家重点实验室,成都610031 [2]唐山轨道客车有限责任有限公司,丰润063035

出　　处：《焊接学报》2012年第11期77-82,117,共6页Transactions of The China Welding Institution

基　　金：国家科技支撑计划资助项目(2009BAG12A04-D02)

摘　　要：文中对EN 5083铝合金对接接头进行了一次、二次和三次焊补等试验.进行了微观组织、硬度、拉伸、冲击、抗剪强度和压入率的分析.结果表明,焊补层的晶粒比原焊缝的大,α(Al)+β(Mg2Al3)共晶网状组织变得更大.焊补层熔合区的受热析出的第二相也更多.三次焊补之间的硬度、抗拉强度、冲击韧性变化不大,断口剪切唇区很明显,说明都是韧性断裂.焊缝处抗剪强度比较低.焊补后,抗剪切能力下降,但是趋于稳定,三次焊补的质量几乎和二次焊补一样,说明在控制好工艺和减少焊接缺陷的情况下,试件有进行三次焊补的可能.One time,second time and third time welding reworking test were employed to test the EN 5083 welding joints.The morphology,hardness,tensile strength,impact toughness,cutting strength and push rate were analyzed.The results showed that the grains of the reworking layers were larger than the original welding layers.The α(Al)+β(Mg2Al3)net like morphology were much larger.The second phase after heated of the fusion area was much more than the original welding layers.The hardness,tensile strength,impact toughness were the same as the original welding layers.The cutting tongue of fracture was obviously which manifested the fracture mechanism was toughness.The cutting strength of the weld was lower but distributed stable.The cutting strength of different layers was the same as original which manifested the properties of the welding reworking layers were well.So the third reworking may be possible.

关 键 词：EN 5083铝合金 多次焊补 第二相 韧性断裂 

分 类 号：G405[文化科学—教育学原理]