An arc welding method alternately generates a short-circuit state and an arc state. In the method, short circuits are generated also in the arc period. This more than doubles the total number of short circuits, which is the sum of the short circuits generated in the short circuit period and those generated in the arc period. This enables a thin plate to be arc welded at a higher speed, while reducing its burn-through.

A method of and system for controlling high frequency arc initiation in a power supply is provided. The power supply includes an output circuit that outputs at least one of a voltage waveform and a current waveform. High frequency, high voltage pulses are induced across a gap between an electrode and a workpiece to create an arc. The method and system further include monitoring at least one of a voltage reading and a current reading across the gap to determine a condition of the arc and controlling the high frequency, high voltage pulses based on the condition of the arc and the type of process, which can be, e.g., SMAW, GTAW, GMAW, FCAW, etc.

A power source applies an AC voltage between a welding torch and a workpiece. The power source includes an inverter circuit to switch between a positive polarity and an opposite polarity, a restriking circuit to apply a restriking voltage to an output of the inverter circuit when the positive polarity is switched to the opposite polarity, and a control circuit to control the restriking circuit. The restriking circuit includes a restriking capacitor to be charged with the restriking voltage, a charging circuit to charge the restriking capacitor with the restriking voltage, and a discharging circuit to discharge the restriking voltage in the restriking capacitor. The control circuit causes the charging circuit to start charging at a time of the opposite polarity, and to end charging after the opposite polarity is switched to the positive polarity.

In thin sheet welding, when a heat input amount relative to a sheet thickness is too large, a welding defect such as a deviation from aim due to occurrence of a strain or burn through may easily occur. When a welding current is decreased to reduce the heat input amount, there is an issue in which an arc tends to become unstable. In arc welding that repeats short-circuit and arcing, first heat input period (Th) and second heat input period (Tc) having a heat input amount less than that of first heat input period (Th) are periodically repeated. This reduces the heat input amount into a welding object and suppresses burn through and a strain upon welding while making the arc stable.

A welding device for carrying out a TIG welding process, which device enables improved control the welding process. A measuring winding is provided in an ignition device and a second voltage measuring device is provided in the welding device for detecting a measuring winding voltage at the measuring winding; and/or a measuring winding simulation device is provided in the welding device for simulating a virtual measuring winding of the ignition device and for determining a measuring winding voltage at the virtual measuring winding; and a control unit is designed to use the power source voltage and the measuring winding voltage detected by the second voltage measuring device or determined by the measuring winding simulation device to determine a TIG arc voltage at the TIG arc, and is designed to use the determined TIG arc voltage to control the TIG welding process.

There is provided an arc welding control method of alternating feeding of a welding wire between forward feeding and reverse feeding periodically to generate a short-circuiting period and an arc period in a manner that shifting to the arc period is performed by reducing a welding current in the reverse feeding during the short-circuiting period. Reduction of the welding current is started from a time where a state of the reverse feeding reaches a predetermined reference state.

A welder power supply and welding method are provided which utilizes a short arc welding method in which the waveforms have a positive polarity portion and negative portion to optimize heat input and provide heat and current control.

Systems and methods providing low current regulation for AC arc welding processes to regulate arc welding performance. In arc welding power source embodiments, configurations of bridge and arc regulation circuits allow for the directional switching of the welding output current through the welding output circuit path and induce a voltage between the electrode and the workpiece of the welding output circuit path that is sufficient to re-ignite the arc during polarity transition of the output current. The arc regulation circuit provides a high inductance level for storing energy, in both polarities, which induces the voltage level for re-igniting the arc during the zero crossing of the output current and provides low end stabilization of arc current.