| 摘要 |
<p>The invention relates to a welding device which carries out the welding by the carbon dioxide electric arc welding method in which the carbon dioxide is taken as the protective gas, and the short circuit state and the arc state occur alternatively. The welding device includes a control power supply circuit which outputs a high level current in an initial first arc period (Ta1) in a later arc period in a short circuit period, and outputs an arc current which is corresponding to the welding voltage controlled by constant voltage in a second arc period (Ta2) in the later arc period. Compared with the condition that the speed set value of the speed of the welding wire exceeds a specific scope (X2), when the speed set value is within the specific scope (X2), the amplitude which increases and decreases at a specific period on a high level basic value current is increased. In such a manner, the stable welding can be carried out in a short circuit transfer area and a droplet transfer area.</p> |
