不同轴向压力对铝合金侧墙搅拌摩擦焊质量的影响

Research on the effect of different axial force on the friction stir welding quality of aluminum alloy side wall

对6005A-T6铝合金侧墙型材进行搅拌摩擦焊(FSW)工艺试验,从宏观金相、拉伸性能和弯曲性能等方面分析得出铝合金地铁侧墙型材的合理工艺参数:主轴转速800 r/min,焊接速度1 000 mm/min,轴向压力14.5 k N,压入量0 mm。在主轴转速和焊速一定的情况下,轴向压力及压入量变化对试件拉伸性能和弯曲性能影响较小。轴向压力的范围不能过大或过小,轴向压力过大易导致搅拌头下扎,损伤母材,轴向压力过小,母材金属搅拌不充分易导致隧道缺陷的产生。随着压入量的增大,越容易产生飞边。

In this paper,friction stir welding （FSW） was applied to join 6005A-T6 aluminum alloy side wall profiles. By using macro- scopic metallurgical analysis,tensile tests and bending tests,optimal welding parameters were identified：spindle speed 800 r/min, welding speed 1000 mm/min,axial force 14.5 kN,shoulder plunge depth 0 mm. For a certain spindle speed and welding speed,axial force and shoulder phmger depth had less effects on the tensile and bending properties of joints. The axial force should he controlled critically. Overhigh axial force led to friction tool press down excessively,which damaged the base metal. The axial force being too low induced tunnel defects due to the insufficient stirring in base metah As the shoulder plunger depth increased, flashes became easy to form.