| 摘要 |
<p>An electric arc welding system and an electric arc welding method capable of forming a welding bead of uniform width are provided. The electric arc welding system (A21) comprises an output circuit (31), in which a droplet transfer period during which a pulse current flows through a consumption electrode (15) and a cooling period during which a molten pool formed in a base material (W) is cooled are alternatively repeated, wherein the waveform of the pulse current is formed by repeated unit pulse waveforms, and the unit pulse waveform comprises a peck period during which the current flows with a peak value and a reference period during which the current flows with a reference value smaller than the peak value. The electric arc welding system (A21) further comprises a set-time storage unit (36) for storing a set time (Tr); a set-number storage unit (35) for storing a set number (Nb); a pulse number calculating circuit (32) for calculating the number of the peak period during each set time (Tr), namely a standard pulse number (Na), based on the set time (Tr); and a stop judgment circuit (34) for sending a stop indication signal (Es) if the number of the peak period exceeds the set number (Nb) during the droplet transfer period. When the output circuit (31) receives the stop indication signal (Es), the droplet transfer period is stopped. According to the construction, a welding bead of uniform width and beautiful appearance can be formed. Besides, an electric arc welding system facilitates the operations of most operators is provided.</p> |
