铝/铜异种金属搭接无倾角微搅拌摩擦焊接工艺特性

Micro Friction Stir Welding Technology Research of Aluminum/Copper Ultra Thin Plate With Zero Tile Angle

以0.5mm厚6061铝合金和2mm厚T2紫铜搭接接头为研究对象,开展了无倾角微搅拌摩擦焊接试验,通过对搅拌工具材料选择、焊缝成形、接头性能分析,研究了其焊接工艺特性。试验结果表明,相比热作模具钢,采用高速工具钢制成的搅拌工具有更长的使用寿命。对于铝/铜搭接接头,无倾角微搅拌摩擦焊接能获得成形良好的焊缝,并且其工艺窗口宽泛,接头的力学性能良好,其承载能力能够达到铝合金母材的95%以上,但是当焊接速度为200mm/min时,主轴转速一旦超过25000r/min,焊缝表面将会出现沟槽缺陷。

The overlap joint, consisting of 6061 aluminum alloy which is 0.5mm thickness and T2 copper which is 2mm thickness, was welded in the micro friction stir welding process with zero tile angle. Meanwhile, the characterizations of welding process were studied by analyzing the materials selection of welding tool, weld quality and mechanical properties. Result showed that comparing to hot work die steel, welding tool made of high-speed tool steel had a longer working life. As for the overlap joint of aluminum and copper, an excellent weld shape can be acquired through micro friction stir welding with zero tile angle, moreover, the process window was wide, the mechanical properties of the joint are excellent, and its load bearing capacity can be over 95% of that of the 6061 aluminum alloy. However when the welding speed was 200mm/min and the spindle speed over 25000r/min, the grooves defect appeared on the weld.