| 摘要 |
PURPOSE:To obtain titled welding method that allows stable spray transfer even in case of small current welding by making peak current and pulse width larger than values that allow spraying, and setting welding current and voltage changing frequency or pulse width. CONSTITUTION:Voltage of each electrode is detected by voltage detecting circuits 7, 8 to obtain constant-voltage characteristics. Pulse voltage is averaged to grasp it as average voltage, and feeds back to become set average voltage by changing switching frequency. That is, as peak current and pulse width are made constant, average voltage becomes larger with increase of frequency, and average voltage drops with decrease of frequency. Thus, even if peak current is constant, average voltage of each electrode can be changed independently and arbitrarily by changing average voltage setting potentiometers 14, 15. Accordingly, welding of spray transfer is made easy and welding can be performed on proper area. |
