| 摘要 |
PURPOSE:To eliminate the over-thrust at the starting and to cause transfer to the arc in a short time by setting the set value of the peak current value of pulses at the arc starting and the set value of background current value larger than the set values in a steady time. CONSTITUTION:Before a wire 1 arrives at base materials 3, the pulse-like voltage of which the set value of the peak current value and the set value of the background current value are set higher than the set values in a steady time (at the arc generating) is applied to the wire and the feeding of the wire is started. When the wire 1 short-circuits to the materials 3, the pulse current and the background current flow but since the set values of both are set higher, the heat input to be applied upon the wire 1 is larger than that in the prior art, thus the wire 1 is melt-cut easily and is transferred to the arc in a short time. Immediately after this, said set values are returned to the set values in the steady time, by which the wire feed troubles such as buckling of the wire 1 owing to the failure in the arc starting are prevented. |
