铝脉冲MIG焊亚射流过渡的自适应控制

针对铝脉冲MIG焊亚射流过渡区范围窄,不易控制的特点,提出了铝脉冲MIG焊亚射流过渡自适应控制思想.在所提出的控制思想中,设计了一个亚射流过渡区域,设置了该区域的电弧电压的上下限,电源根据电弧电压值来确定电弧电流的大小,自动将电弧的电流、电压控制在亚射流过渡区内,自动适应送丝速度的变化及弧长的波动.根据此控制思想,对于直径1.6 mm的铝焊丝选择此电压上下限的范围在14.5～22 V之间,选择焊接电流在30～235 A之间.所进行的脉冲焊接试验及高速摄像证明了对亚射流过渡过程的控制,得到了成形良好的焊缝,也较好地避免了焊接缺陷的产生.

A self-adapting control method of Al pulsed-MIG welding for meso-spray transfer

A new self-adapting control method of A1 pulsed-MIG welding was presented,and a meso-spray zone with a specified arc voltage bound is designed to control the droplet transfer in the meso-spray zone in spite of its characteristic of narrow scope and difficult manipulation.From the method,the arc current and voltage can be automatically controlled within the meso-spray zone by confirming the pulsed current in response to the arc voltage and also automatically meet the fluctuating of wire feed rate and arc length.For Aluminum wire of 1.6 mm diameter,the meso-spray zone based on the above control idea is confined within 14.5-22 V and 30-235 A,and the pulsed welding experiments companied with high speed photogragh are put into effect and show good control of meso-spray,the good weld appeararce and better prevention from producing welding defects.