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大电流MIG焊接时,电弧仍为喷射型式,但是,为克服粗丝、大电流焊接所招致的焊道成型恶化(表面折皱)、电弧不稳定,必须对原MIG焊机的电源特性、焊枪及电弧控制方式作较大的改动。图1是大电流焊接铝板时的电弧特性。横轴为焊接电流,纵轴为外露电弧长度(电极前端与母材表面的距离)。图中曲线是使用不同保护气体,在焊丝进给速度不变的条件下,电流值与弧长的关系。采用某一电流焊接时的适宜弧长示于斜虚线范围,这是指埋入母材的部分
In high-current MIG welding, the arc is still sprayed. However, in order to overcome the deterioration of the weld bead (surface wrinkle) and arc instability caused by thick current and high current welding, the power characteristics of the original MIG welding machine, Arc control for larger changes. Figure 1 is the arc characteristics of high current welding aluminum. The horizontal axis is the welding current, and the vertical axis is the length of the exposed arc (the distance between the front end of the electrode and the surface of the base metal). The curve is the use of different shielding gas, wire feed speed in the same conditions, the current value and arc length relationship. The appropriate arc length for welding with a certain current is shown in the diagonal dotted line range, which is the portion buried in the base metal