搅拌摩擦与氩弧焊铝合金接头疲劳性能的比较  

Comparison of fatigue properties between friction stir welds and TIG welds for Al alloy

作　　者：王快社[1] 张小龙[1] 王训宏[1] 徐可为[2] 

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055 [2]西安交通大学金属材料强度国家重点实验室,西安710049

出　　处：《材料研究学报》2009年第1期73-76,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金50774059;陕西省重点学科(材料加工工程)资助项目~~

摘　　要：建立了铝合金焊接接头的S-N曲线，对比分析了搅拌摩擦和氩弧焊两种工艺对其焊接接头疲劳性能的影响．结果表明：在载荷相同的条件下，铝合金搅拌磨擦焊接接头的疲劳性能优于氩弧焊接头．搅拌摩擦焊接头的疲劳寿命N=10^6次的疲劳强度为59—65MPa．搅拌摩擦焊接接头具有比氩弧焊接头更为细小的晶粒和狭窄的焊接热影响区，阻碍了滑移带的形成和裂纹的扩展，从而提高了接头的疲劳性能．铝合金焊接接头的缺陷是主要的疲劳裂纹源．The effect of welding processes friction stir welds （FSW） and tungsten inert gas welding（TIG） on fatigue properties of LF2 aluminum welded joints was analyzed, and the S-N curves of the welded joints were established. The results show that the fatigue properties of FSW welded joints are better than that of TIG welded joints. Fatigue strength of friction stir welds is 59-65 MPa under N=10^6. The microstructures of joints are comparatively fine grain and narrow HAZ zone in the FSW welds which inhibit the growth of crack and produce high fatigue life compared to that of the TIG welds. Fracture morphologies of TIG welds show that the fatigue fracture occurs from weld defects.

关 键 词：金属材料 搅拌摩擦焊 TIG焊接 疲劳性能 

分 类 号：TG407[金属学及工艺—焊接]