A time-based short circuit response is employed when a short circuit event occurs during a welding process. When short circuit occurs, a time until a predetermined event in the welding process is determined. Based on the time remaining before the predetermined event, a particular short circuit response is executed.

A TIG-type method for tack welding two metal sheets or parts, such as tubes. The method includes, for each zone/point of tack welding of the metal sheets or of the tubes, a tack welding cycle including successively applying at least one smooth or pulsed direct current DC, and then at least one smooth or pulsed alternating current AC.

An arc welding or additive manufacturing system includes a wire feeder, a torch, a wire electrode driven through the torch by the wire feeder, and an arc generation power supply operatively connected to the torch to deliver a pulse waveform to the wire electrode during a deposition operation. The pulse waveform includes a series of current pulses and interleaved background current portions such that each current pulse is separated from a prior current pulse by a prior background current portion and separated from a subsequent current pulse by a subsequent background current portion. During each current pulse a molten droplet is projected from a tip of the wire electrode followed by an axial spray of molten metal away from the tip of the wire electrode before the subsequent background current portion occurs.

Method and arrangement for carrying out a multiple pulse welding method in which an ideal ratio between the root-mean-square value of the welding current and the welding wire feeding speed is determined from a known relationship between the pulse frequency and the welding wire feeding speed, an actual root-mean-square value of the welding current is determined by the welding current with the pulse frequency to be set, and at least one pulsed current parameter of the welding current of the pulse welding process and/or the welding wire feeding speed of the pulse welding process is changed in order to change the actual ratio to the ideal ratio.

A stud welding process and a stud welding device for welding a stud to a workpiece are provided, wherein an arc (LB) is generated between the surface of the stud that faces the workpiece and the workpiece by using a pulsed welding current (Is), and the arc (LB) is deflected by means of a magnetic field which is generated by a coil through which a current (I.sub.A) flows. The current (I.sub.A) through the coil for generating the magnetic field for deflecting the arc (LB) is activated synchronously and in anti-phase with the welding current (I.sub.s) by a current (I.sub.A) always being applied to the coil when the welding current (I.sub.s) is at a minimum, and the coil being switched off or the current (I.sub.A) through the coil being reduced to a minimum when the welding current (I.sub.s) is at a maximum.

An additive manufacturing apparatus forms layers with a material that is molten to produce a formed object. The additive manufacturing apparatus includes a CMT power supply that supplies as a power supply current to heat a wire that is the material fed to a workpiece, to the material; a laser oscillator that produces as a beam source a laser beam that is a beam with which the workpiece is irradiated; and a head drive unit that shifts as a drive unit a feed position for the material on the workpiece and an irradiation position for the beam on the workpiece. The additive manufacturing apparatus shifts the feed position and the irradiation position, with the irradiation position leading in a moving path for the feed position in spaced relation to the feed position.

A welding system configured to eliminate effects of arc blow in a welding operation. The welding system comprises welding circuitry, preheat circuitry, and control circuitry configured to switch the welding circuitry and the preheat circuitry between power levels asynchronously during the welding operation. The control circuitry configured to switch the welding circuitry and the preheat circuitry between power levels asynchronously such that the preheat circuitry is switched to the second preheat power level when the welding circuitry is switched to the first welding power level and the preheat circuitry is switched to the first preheat power level when the welding circuitry is switched to the second welding power level.

An example welding-type system includes: power conversion circuitry configured to convert input power to welding-type power; an interface configured to: receive a selection of a parameter from a plurality of parameters; and receive a selection of a value for the selected parameter; and control circuitry configured to: in response to the selection of the parameter from the plurality of parameters, control the interface to output a visual indication of an effect of changing the parameter on at least one of a welding electrode, a quantity of discontinuities in the weld, a magnitude of a discontinuity in the weld, or a quantity of inclusions in the weld; in response to a change in the value of the selected parameter via the interface, control the interface to change the visual indication of the effect based on the change in the value; and control the power conversion circuitry based on the value.

A dual-pulse MIG welding power source based on SiC power devices may include a main circuit and a digital control circuit. The main circuit may include a power frequency rectifier filter module, a first SiC high frequency inverter module, a first high frequency transformer, and a first SiC fast full-wave rectifier filter module connected sequentially. The power frequency rectifier filter module may be connected to a three-phase AC power supply, and the first SiC fast full-wave rectifier filter module may be connected to a load. The digital control circuit may include a digital human-machine interaction module, a core control module, a SiC high-frequency drive module, a load voltage and current detection feedback module, and a wire feeding control module. The digital human-machine interaction module may be connected to the core control module.

A non-consumable electrode arc-welding method is provided for causing a welding machine to output or stop a welding current in accordance with at least an ON state and an OFF state of a start signal. In the method, a start signal is switched between an ON state and an OFF state, thereby controlling the on/off operation of the welding machine. Further, an operation mode instruction signal is switched between a normal mode and an interval mode, thereby controlling the operation mode of the welding machine. When the operation mode instruction signal indicates the interval mode and also the start signal is in the ON state, the welding current is outputted in a welding current output period. Then, the output of the welding current is suspended in a welding current interval period successively following the welding current output period.