Abstract: A welding system performs communication accurately without provision of a control line between a welding power supply device and a wire feeding device. The welding system includes a welding power supply device, a wire feeding device, a welding torch, and power cables for supplying welding power from the welding power supply device to the welding torch. The system also includes power transfer lines for supplying power for driving a feeding motor disposed in the wire feeding device, so that the welding power supply device and the wire feeding device perform communication via the power transfer lines. The power transfer lines have less superimposed noise compared to the power cables. Accordingly, communication can be performed more accurately than in the case of performing communication via the power cables.

Abstract: A welding system performs communication accurately without provision of a control line between a welding power supply device and a wire feeding device. The welding system includes a welding power supply device, a wire feeding device, a welding torch, and power cables for supplying welding power from the welding power supply device to the welding torch. The system also includes power transfer lines for supplying power for driving a feeding motor disposed in the wire feeding device, so that the welding power supply device and the wire feeding device perform communication via the power transfer lines. The power transfer lines have less superimposed noise compared to the power cables. Accordingly, communication can be performed more accurately than in the case of performing communication via the power cables.

Abstract: A power supply apparatus includes an air path extending longitudinally, a fan that blows air into the air path in a direction intersecting a longitudinal direction of the air path, and a plurality of electronic components arranged in the longitudinal direction. Each of the electronic components is cooled by air passing through the air path. With this configuration, it is possible to efficiently cool the electronic components without compromising the flexibility of arrangement of the various electronic components. Also, a dust removal operation can be readily performed without the possibility of damaging the fan.

Abstract: A power supply apparatus includes an air path extending longitudinally, a fan that blows air into the air path in a direction intersecting a longitudinal direction of the air path, and a plurality of electronic components arranged in the longitudinal direction. Each of the electronic components is cooled by air passing through the air path. With this configuration, it is possible to efficiently cool the electronic components without compromising the flexibility of arrangement of the various electronic components. Also, a dust removal operation can be readily performed without the possibility of damaging the fan.

Abstract: An inverter power supply system includes a half-bridge inverter circuit which includes a first switching element, a second switching element, a first auxiliary capacitor and a second auxiliary capacitor for converting a DC voltage from a DC power supply circuit to an AC voltage. An output control circuit outputs a first output control signal and a second output control signal with a phase difference of a half cycle to control the inverter circuit. An inverter driving circuit turns on the first (or second) switching element when the first (or second) output control signal turns ON while turning off the first (or second) switching element upon lapse of a first (or second) delay time for allowing the first (or second) auxiliary capacitor to discharge to a predetermined level after the first (or second) output control signal turns OFF.

Abstract: An inverter power supply system includes a half-bridge inverter circuit which includes a first switching element, a second switching element, a first auxiliary capacitor and a second auxiliary capacitor for converting a DC voltage from a DC power supply circuit to an AC voltage. An output control circuit outputs a first output control signal and a second output control signal with a phase difference of a half cycle to control the inverter circuit. An inverter driving circuit turns on the first (or second) switching element when the first (or second) output control signal turns ON while turning off the first (or second) switching element upon lapse of a first (or second) delay time for allowing the first (or second) auxiliary capacitor to discharge to a predetermined level after the first (or second) output control signal turns OFF.

Abstract: A power supply for performing arc-machining operation includes a primary rectifier connected to the commercial AC power source and an inverter coupled to the rectifier. A switching device is provided between the rectifier and the inverter. By controlling the power supplied from the rectifier to the inverter, the switching device prevents a large switching loss from occurring in the inverter.

Abstract: A power supply for performing arc-machining operation includes a primary rectifier connected to the commercial AC power source and an inverter coupled to the rectifier. A switching device is provided between the rectifier and the inverter. By controlling the power supplied from the rectifier to the inverter, the switching device prevents a large switching loss from occurring in the inverter.

Abstract: An MAG arc welding method and apparatus is capable of achieving a welding bead in a regular ripple pattern or in a suitable sectional form. The welding power source generates the first welding current I1 and a second welding current I2 larger than the first welding current. The wire melting speed is changed by switching between the first and the second welding currents. The welding method or apparatus according to the invention generates the first arc length more than 2 mm and the second arc length more than the first arc length and switches between both arc length at a switching frequency F of 0.5 to 25 Hz. The ratio of the second to the first welding currents is made to be in 1.03 to 1.20. In addition to a welding method to change the arc length by switching the first and the second welding currents at a constant wire feeding rate, the present welding method makes it possible to carry out the lap welding or butt welding even when there is a large gap.

Abstract: An MAG arc welding method and apparatus is capable of achieving a welding bead in a regular ripple pattern or in a suitable sectional form. The welding power source generates the first welding current I1 and a second welding current I2 larger than the first welding current. The wire melting speed is changed by switching between the first and the second welding currents. The welding method or apparatus according to the invention generates the first arc length more than 2 mm and the second arc length more than the first arc length and switches between both arc length at a switching frequency F of 0.5 to 25 Hz. The ratio of the second to the first welding currents is made to be in 1.03 to 1.20. In addition to a welding method to change the arc length by switching the first and the second welding currents at a constant wire feeding rate, the present welding method makes it possible to carry out the lap welding or butt welding even when there is a large gap.

Abstract: An MAG arc welding method and apparatus is capable of achieving a welding bead in a regular ripple pattern or in a suitable sectional form. The welding power source generates the first welding current I1 and a second welding current I2 larger than the first welding current. The wire melting speed is changed by switching between the first and the second welding currents. The welding method or apparatus according to the invention generates the first arc length more than 2 mm and the second arc length more than the first arc length and switches between both arc length at a switching frequency F of 0.5 to 25 Hz. The ratio of the second to the first welding currents is made to be in 1.03 to 1.20. In addition to a welding method to change the arc length by switching the first and the second welding currents at a constant wire feeding rate, the present welding method makes it possible to carry out the lap welding or butt welding even when there is a large gap.

Abstract: A power supply for performing arc-machining operation includes a primary rectifier connected to the commercial AC power source and an inverter coupled to the rectifier. A switching device is provided between the rectifier and the inverter. By controlling the power supplied from the rectifier to the inverter, the switching device prevents a large switching loss from occurring in the inverter.