搅拌摩擦焊接头摩擦磨损性能研究

在MM-200型摩擦磨损试验机上分别试验了LF2铝合金搅拌摩擦焊接接头焊缝区和母材的摩擦磨损性能。通过测定失重量和摩擦力矩的波动情况，得出了在不同的工艺参数条件下试样的抗磨损性和摩擦因数的变化规律。实验结果表明：搅拌摩擦焊接头的摩擦磨损性能明显优于母材，当正压力从50N增加到106N时，母材的失重量增加近6倍，母材的失重量在同等垂直载荷的情况下是焊缝的10-20倍。实验还表明搅拌摩擦焊接接头的摩擦力矩较小并且波动平缓。搅拌摩擦焊接头区域的磨损机制从磨粒磨损方式转变为疲劳磨损方式。

Research on Friction and Wear Properties of Joint by Friction Stir Welding

Friction and wear behaviors were studied between the untreated base material and the friction stir welds of LF2 aluminum alloy on MM-200 abrasion tester. Variation rule of wear-resistance property and coefficient of friction were investigated by testing for wear mass loss and moment of friction under different parameter condition. The result shows that friction stir weld show much better wear-resistance than base material. The abrasion loss of base material increases by six times when position pressure increases from 50 N to 100 N and the abrasion loss is as 10 - 20 times as that of friction stir welds. The number of friction-moment of friction stir welds is low and stable and abrasion principle changes from grain abrasion to fatigue wear.