Pulse arc welding control method and pulse arc welding device

A pulse arc welding device comprising:

• a switching element for controlling welding output current;
• a welding current value detector for detecting welding output current;
• a welding voltage value detector for detecting welding output voltage;
• an arc short-circuit judging section for judging whether a welding state is in a short-circuit period or in an arc period;
• a setting section for defining parameter used for the short-circuit period and the arc period;
• a pulse-waveform circuit section for controlling pulse output in the arc period according to at least any one of outputs from the welding current value detector, the welding voltage value detector, and the setting section;
• a dip-waveform circuit section for controlling output in the short-circuit period according to at least any one of outputs from the welding current value detector, the welding voltage value detector, and the setting section;
• a secondary control section for sharply decreasing welding current on detecting a moment at which a tip of a wire has a neck just before recovery from a short-circuit, according to at least any one of outputs from the welding current value detector, the welding voltage value detector, and the setting section;
• and
• a driving section that selects from outputs of the pulse-waveform circuit section, the dip-waveform circuit section, the secondary control section according to a signal from the setting section and an output from the arc short-circuit judging section, and sends the selected data to the switching element.