Abstract: A welding condition inputting equipment capable of setting the welding conditions such as welding current and welding voltage easily and securely is disclosed. The welding condition inputting equipment comprises an operating section for inputting the welding conditions, a determining section for selecting items, and a display section for displaying selected items. When the welding conditions are input, the operating section outputs the conditions to the determining section. When the conditions are input in the determining section, the determining section selects items relating to welding corresponding to the conditions, and outputs the items to the display section. When the items are input in the display section, the display section displays the items. The operating section specifically includes a dial, a switch, and a push-in dial switch integrally combining a dial rotation detecting part.

Abstract: A welding condition inputting equipment capable of setting the welding conditions such as welding current and welding voltage easily and securely is disclosed. The welding condition inputting equipment comprises an operating section for inputting the welding conditions, a determining section for selecting items, and a display section for displaying selected items. When the welding conditions are input, the operating section outputs the conditions to the determining section. When the conditions are input in the determining section, the determining section selects items relating to welding corresponding to the conditions, and outputs the items to the display section. When the items are input in the display section, the display section displays the items. The operating section specifically includes a dial, a switch, and a push-in dial switch integrally combining a dial rotation detecting part.

Abstract: An arc welding and arc plasma cutting machine having a dc high-voltage generator is provided. The dc high-voltage generator includes a first dc power source, a second dc power source, an one-way rectifier, and a voltage clamping circuit. The first dc power source applies a dc voltage through the one-way rectifier across an electrode and a work piece. The second dc power source is connected across the first dc power source and superimposes a dc voltage on the power produced by the first dc power source for developing an arc discharge across the electrode and the work piece. The voltage clamping circuit connected in parallel to the one-way rectifier to restrict a high-voltage applied to the one-way rectifier below a given level for protecting the one-way rectifier from breakage due to application of the high-voltage.

Abstract: An arc welding power source comprises a pair of rectifiers connected in parallel with each of double star connection three phase rectifying circuits and a capacitor connected in parallel with the entire rectifying circuit without a DC reactor. As a result, the arc welding power source can supply stable welding current having a smooth waveform and enough short circuit current.