Pulse welding apparatus

A pulse welding apparatus comprising:

• a pulse current waveform control circuit for outputting a group of pulse currents including a plurality of pulse currents having more than one pulse peak value, a smoothed current waveform of the group of pulse currents becoming a maximum peak value during a pulse group duration at a predetermined time, said group of pulse currents being periodically repeated to form a train of said group of pulse currents;
• a timing unit for setting, based on welding conditions, the predetermined time occurring at any time after the beginning of outputting the group of pulse currents during the pulse group duration;
• and
• a pulse arc current waveform generator for generating a pulse arc current waveform by superimposing a continuous base current onto the train of said pulse group currents.

A pulse welding apparatus comprising:

• a pulse current waveform control circuit for outputting a group of pulse currents including a plurality of pulse currents having more than one pulse width, a smoothed current waveform of the group of pulse currents becoming a maximum peak value during a pulse group duration at a predetermined time after a beginning of outputting the group of pulse currents, said group of pulse currents being periodically repeated to form a train of said group of pulse currents;
• a timing unit for setting, based on welding conditions, the predetermined time occurring at any time after the beginning of outputting the group of pulse currents during the pulse group duration;
• a smoothed current waveform generator for generating a signal representing the smoothed current waveform of the group of pulse currents, wherein said pulse current waveform control circuit generates said plurality of pulse currents based on said signal;
• and
• a pulse arc current waveform generator for generating a pulse arc current waveform which is formed by superimposing a continuous base current onto the train of said pulse group currents.

A pulse welding apparatus comprising:

• a pulse current waveform control circuit for outputting a group of pulse currents including a plurality of pulse currents being spaced by more than one pulse interval, a smoothed current waveform of the group of pulse currents becoming a maximum peak value during a pulse group duration at a predetermined time after a beginning of outputting the group of pulse currents, said group of pulse currents being periodically repeated to form a train of said group of pulse currents;
• a timing unit for setting, based on welding conditions, the predetermined time occurring at any time after the beginning of outputting the group of pulse currents during the pulse group duration;
• a smoothed current waveform generator for generating a signal representing the smoothed current waveform of the group of pulse currents, wherein said pulse current waveform control circuit generates said plurality of pulse currents based on said signal;
• and
• a pulse arc current waveform generator for generating a pulse arc current waveform by superimposing a continuous base current onto the train of said pulse group currents.