铝合金搅拌摩擦与MIG焊接接头疲劳性能对比试验

基金项目: 中国搅拌摩擦焊中心北京赛福斯特技术有限公司联合研究资助项目(cfswt-34-041014)

Experimental comparision of fatigue properties for 5A06 aluminium alloy friction stir and metal inert-gas welded joints

1.
School of materials Science and Engineering, Tianjing University, Tianjin 300072, China
2.
Beijing FSW technology Co. Ltd, Beijing 100024, China

摘要: 根据疲劳S-N曲线试验结果,对5A06铝合金搅拌摩擦焊(FSW)和MIG焊接接头的疲劳性能进行了初步比较,分析讨论了搅拌摩擦焊过程中所产生的焊接缺陷对其疲劳性能的影响。结果表明,在焊态下由于焊接接头几何形状等的影响,FSW的疲劳强度明显高于MIG焊接接头;对FSW焊缝根部的"吻接"缺陷(kissing-bonds)是降低FSW焊接接头疲劳寿命的主要因素,旋转搅拌工具在焊缝表面形成的多余飞边将对疲劳行为产生明显影响。
- 搅拌摩擦焊接头 /
- MIG焊接头 /
- 疲劳性能
Abstract: Based on the S-N curves,the comparision of fatigue performance for 5A06 aluminimum alloy friction stir welding(FSW) and MIG(metal inert-gas) welded joints were conducted,and the effects of welding defects during FSW on the fatigue properties of FSW joints were discussed.It was shown that the fatigue strength of FSW joints was obvious higher than that of MIG joints because of the influence of different weld geometrical shape etc.,and the kissing-bond defects at the root of FSW joints was the important factor to reduce the fatigue strength of FSW joints,and the rotating ridge produced by the friction stir tool shoulder on the weld surface of FSW would have an apparent decrease on the fatigue life.
- friction stir welded joints /
- metal inert-gas welded joints /
- fatigue properties