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采用自行研制的无匙孔搅拌摩擦点焊方法对3mm厚AZ31B镁板和1mm厚DP600镀锌钢板异种金属进行搭接焊接(钢板在上,镁板在下),研究了其焊接工艺参数对焊点成形及力学性能的影响。通过正交试验结果分析表明:参数因素影响从主到次为:B(轴肩下压量)→A(搅拌头旋转速度)→C(搅拌针直径)。在焊接时间一定时,确定了搅拌针伸出量为1.8～2.0mm、转速为1200～1500r/min、轴肩下压量为0.1～0.3mm、搅拌针直径为5.5～6.0mm时,得到的接头表面成形较好,接头剪切力均能达到7.5kN以上。
Using self-developed keyhole friction stir spot welding method, 3mm thick AZ31B magnesium plate and 1mm thick DP600 galvanized steel dissimilar metal lap welding (steel plate on the magnesium plate in the next), studied the welding process parameters on the solder joint Forming and mechanical properties of the impact. The results of orthogonal test showed that the influence of parameter factors from main to secondary was: B (under-shoulder pressure) → A (rotation speed of stirring head) → C (stirring pin diameter). When the welding time is constant, it is determined that the extending amount of the stirring needle is 1.8-2.0mm, the rotating speed is 1200-1500r / min, the axial pressing amount is 0.1-0.3mm and the diameter of the stirring needle is 5.5-6.0mm The joint surface is well formed, the joint shear force can reach above 7.5kN.