一、二次补焊对高速列车用铝合金焊接接头疲劳性能的影响  

Influence on fatigue performance of once and twice repairing welding of 6082 aluminum alloy for high speed trains

作　　者：钮旭晶[1,2] 许鸿吉[2] 刘春宁[1] 谢明[2] 鲁二敬[1,2] 

机构地区：[1]唐山轨道客车有限责任公司,河北唐山063035 [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》2011年第11期44-46,83,共4页Electric Welding Machine

基　　金：国家科技支撑计划资助项目(2009BAG12A04-B02)

摘　　要：6082铝合金是高速列车车体的主要材质,因其焊接时易产生气孔、裂纹等缺陷,必须进行焊接返修予以清除。深入研究补焊工艺和补焊次数对焊接接头疲劳性能的影响。通过脉动拉伸疲劳试验研究一、二次补焊6082铝合金焊接接头疲劳性能,并与未补焊的接头疲劳强度进行比较。结果表明,一次补焊后焊接接头的中值疲劳强度显著下降;二次补焊的焊接接头中值疲劳强度比一次补焊时略有下降;二次补焊对6082铝合金焊接接头疲劳性能有一定的影响。6052 aluminum alloy is the main material of high speed train body.While welding,it＇s easy to generate porosity and crack defects and this makes repairing welding nessary.Futher research on the process of repairing welding and the times of repairing welding influence on fatigue performance,then determinating the reasonable repairing welding process and repairing welding times has very important practical significance for impoving the manufacturing level and lowering the production cost of our countries＇ high speed train.This paper have researched the fatigue performance of 6052 aluminum alloy welded joints of once-repairing welding and second-repairing welding through fatigue test ,comparing with the fatigue strength of non-repairing welding connectors.The results show that after once-repairing welding,the median fatigue strength decreases significantly,while the reduce tendency of fatigue limit difference between second-repairing welding and once-repairing welding is slightly;second-repairing welding has certain effect on the fatigue performance of 6082 aluminum alloy welded joints.

关 键 词：6082铝合金 补焊 焊接接头 疲劳性能 

分 类 号：TG457.14[金属学及工艺—焊接]