5mm厚铝合金双面搅拌摩擦焊接

对5mm厚的1050-H24铝合金板材进行了双面搅拌摩擦焊接(FSW)，重点研究了接头的拉伸性能和断裂部位及其影响因素。研究结果表明，一次焊接参数、二次焊接参数和焊接方向对双面FSW接头的拉伸性能和断裂部位有不同程度的影响。一次焊接参数的影响较小，而二次焊接参数的影响显著并且存在最佳取值。同向焊接的接头强度较高且断在前进侧(AS)或后退侧(RS)，而异向焊接的接头强度较低且只断在AS。在文中的试验条件下，1500r／min的旋转速度、400mm／min的二次焊速和同向焊接方式是最佳的工艺组合，接头最高强度达到母材强度的78％。

Two-sided friction stir welding of 5-mm-thick aluminum alloy plate

Two-sidod friction stir welding (FSW) of a 5-mm-thiek plate of 1050-H24 aluminum alloy was performed. The relations of tensile properties and fracture locations of joints to welding parameters were examined. Experimental results showed that the initial bead welding parameters, final bead welding parameters, and their mutual welding directions have different effects on the tensile properties and fracture locations of the joints. The effect of initial bead welding parameters is much lower than that of final bead welding parameters. The same-direction-welded joints possess relatively high strength and fracture on the advancing side (AS) or retreating side (RS), while the opposite-direction-welded joints demonstrate relatively low strength and fracture only on the AS. The experimental study showed that a rotation speed of 1500 r/min, a welding speed of 400 mm/min and a same-direction welding process comprise an optimum combination for the tensile properties of the joints. An ultimate strength of the joints up to 78% of the base material is obtained.