搅拌摩擦焊与氩弧焊接接头摩擦磨损性能研究

Research on Friction and Wear Performances of Joints by TIG and Friction Stir Welding

摘要:

分别试验了LF2铝合金搅拌摩擦焊焊接接头与氩弧焊接接头的摩擦磨损行为，试验分为3个阶段进行，转数分别为480，1200，2400转。结果表明在相同的实验条件下，搅拌摩擦焊接头的摩擦磨损性能明显优于氩弧焊接接头，其中第一阶段磨损失质量差别不大，后两个阶段搅拌氩弧焊接接头的磨损失质量是搅拌摩擦焊接头的4~6倍。氩弧焊接接头磨损表面呈现明显的塑性变形和表层剥落开裂迹象。搅拌摩擦焊接头磨损表面呈现轻微的疲劳磨损特征。

Abstract:

Friction and wear performances were investigated using gas tungsten arc welds and the friction stir welds of LF2 aluminum alloy, and three sorts of revolution speeds, e.g. 480, 1200, 2400 r/min were adopted. The result showed that the friction stir weld showed much better wear-resistance performance than the gas tungsten arc welds under the same condition. There was almost no difference of wear mass loss at 480 r/min. The wear mass loss of friction stir welds was about 4~6 times less that of the gas tungsten arc welds at the other two speeds. The morphologies of the surfaces of worn welds were observed, it was found that the surface of gas tungsten arc welds presented plough ditch and spalling, and the friction stir welds presented mild fatigue wear.