Provided is a touch sensing system that can make the life of a contact of an electromagnetic contactor longer. A touch sensing system includes a main operation circuit that connects a probe and a main operation power supply, and in which an electromagnetic contactor is provided; and a touch sensing circuit that is connected to the main operation circuit through the electromagnetic contactor in a branched manner, and connects the probe and a touch sensing power supply, is which a solid state relay switch is provided in the touch sensing circuit.

Welding power supplies with regulated background power supplies are disclosed. An example welding power supply includes a background circuit, which comprises: a power supply capable of outputting a first power output; an energy storage device configured to be charged by the first power output to a programmable first voltage level; a fast acting switch coupled to the energy storage device and configured to switch to restrict or allow voltage discharge from the energy storage device to welding electrodes; and a control circuit configured to selectively activate the power supply to output the first power output when the energy storage device is not charged to the regulated first voltage level, and further configured to actuate the fast acting switch to allow voltage discharge of the energy storage device from the regulated first voltage level to a controlled second voltage level when a transient high voltage event is detected.

Provided is a touch sensing system that can make the life of a contact of an electromagnetic contactor longer. A touch sensing system includes a main operation circuit that connects a probe and a main operation power supply, and in which an electromagnetic contactor is provided; and a touch sensing circuit that is connected to the main operation circuit through the electromagnetic contactor in a branched manner, and connects the probe and a touch sensing power supply, is which a solid state relay switch is provided in the touch sensing circuit.

A welding power supply device includes an inverter for converting DC power into AC power outputted to a welding load, and a voltage circuit for superimposing a restriking voltage on an output to the welding load when the polarity of output current of the inverter switches. The voltage circuit includes a restriking capacitor charged with the restriking voltage, a charging circuit to charge the capacitor with the restriking voltage, and a discharging circuit to discharge the voltage in the capacitor. The charging circuit includes a DC power supply and a booster to boost DC voltage from the DC power supply. The charging circuit charges the restriking capacitor in first and second states. In the first state, the DC voltage from the DC power supply is directly applied to the restriking capacitor. In the second state, DC voltage boosted by the booster is applied to the restriking capacitor.

The present disclosure relates to electro-conduction devices and methods for submerged arc welding of straight-seam steel pipes and in particular to a lateral electro-conduction device and method for multi-wire submerged arc inner/outer welding of a straight-seam steel pipe. The present disclosure aims to overcome the problem of poor closing of the electromagnetic field resulting from the existing negative-pole electro-conduction mechanism and the problem of unstable welding process resulting from bending deformation in the steel pipe welding process. The device includes: a floating surface contact electro-conduction device, capable of forming a surface contact with an outer surface of the straight-seam steel pipe; a lateral electro-conduction brush device, including multiple electro-conduction brushes and electrically connected with the floating surface contact electro-conduction device; a lateral electro-conduction metal plate, electrically connected with a negative-pole wire harness of a welding machine and electrically connected with the lateral electro-conduction brush device. Therefore, an electro-conduction circuit is formed by the negative-pole wire harness, the lateral electro-conduction metal plate, the lateral electro-conduction brush device, the floating surface contact electro-conduction device, the straight-seam steel pipe and a welding wire electrode.

A stacked output structure of a capacitive power supply for welding equipment, having a plurality of capacitors to be connected in parallel, two electrodes of each capacitor are respectively provided with a pin including a long pin and a short pin; at least two PCB bus plates placed in stack are provided above the capacitor is provided. A lower PCB bus plate is connected with the short pin; and a pass-through hole is provided, at a position corresponds to the long pin, on the lower PCB bus plate. The long pin passes through the pass-through hole in the lower PCB bus plate and is connected with an upper PCB bus plate. There is a gap between the long pin and an inner wall of the pass-through hole.

Welding power supplies with regulated background power supplies are disclosed. An example welding power supply includes a background circuit, which comprises: a power supply capable of outputting a first power output; an energy storage device configured to be charged by the first power output to a programmable first voltage level; a fast acting switch coupled to the energy storage device and configured to switch to restrict or allow voltage discharge from the energy storage device to welding electrodes; and a control circuit configured to selectively activate the power supply to output the first power output when the energy storage device is not charged to the regulated first voltage level, and further configured to actuate the fast acting switch to allow voltage discharge of the energy storage device from the regulated first voltage level to a controlled second voltage level when a transient high voltage event is detected.

Embodiments of a welding power supply including a main power supply and a background power supply are provided. The main power supply includes a first transformer that supplies a first power output to welding electrodes for use in a welding operation. The background power supply includes a secondary transformer that charges an energy storage device to a regulated voltage level and is adapted to discharge the energy storage device by a controlled amount to supply a second regulated power output to the welding electrodes for use in the welding operation when a transient voltage event occurs.

A hybrid-powered (HP) power source (HP power source) for a welding or plasma cutting system comprises: power inputs including an AC input for AC power and a battery input for battery power; an HP power converter to convert one or more of the AC power and the battery power to a weld power for welding or plasma cutting when the HP power converter is turned ON; and ON/OFF control circuitry including a user switch and which is coupled to the power inputs and the HP power converter, wherein the ON/OFF control circuitry is configured to turn ON the HP power converter upon actuation of the user switch while the HP power converter is turned OFF, wherein the ON/OFF control circuitry is configured to connect to the HP power converter whichever of the AC power and the battery power is or are present upon the actuation.

The present disclosure relates to electro-conduction devices and methods for submerged arc welding of straight-seam steel pipes and in particular to a lateral electro-conduction device and method for multi-wire submerged arc inner/outer welding of a straight-seam steel pipe. The present disclosure aims to overcome the problem of poor closing of the electromagnetic field resulting from the existing negative-pole electro-conduction mechanism and the problem of unstable welding process resulting from bending deformation in the steel pipe welding process. The device includes: a floating surface contact electro-conduction device, capable of forming a surface contact with an outer surface of the straight-seam steel pipe; a lateral electro-conduction brush device, including multiple electro-conduction brushes and electrically connected with the floating surface contact electro-conduction device; a lateral electro-conduction metal plate. electrically connected with a negative-pole wire harness of a welding machine and electrically connected with the lateral electro-conduction brush device.