In an arc welding control method for controlling welding in which a material of a base material is a galvanized steel sheet, a feed speed of a welding wire is alternately switched between a forward feed period and a reverse feed period, and a short circuit period and an arc period are repeated, during the arc period, a first arc period Ta1 during which a first arc current Ia1 is applied, a second arc period Ta2 during which a second arc current Ia2 is applied, and a third arc period Ta3 during which a third arc current Ia3 is applied are switched over time, and it is controlled so as to be Ia1>Ia2>Ia3. Constant voltage control is performed during the second arc period Ta2, and constant current control is performed during the first arc period Ta1.

A multi-stage pulse ramp is employed during a welding process. In a first stage, a relatively slower increase in welding output is applied to stabilize a droplet. During a second stage, a relatively quicker increase is applied up to a peak pulse output to transfer the stabilized droplet.

Systems and methods for initiating and/or terminating a GMAW-P welding process are disclosed. A welding-type power supply may include a power conversion circuitry configured to convert input power to welding-type power, and a controller configured to control the power conversion circuitry based on a plurality of operating parameters. In examples, the systems and methods disclosed herein implement pulsed cycles with one or more increased output parameters (such as current, pulse width, etc.) in order to jump start a pulsed welding cycle at a cold start (i.e. at initiation of a welding process), and thereby prevent a ball forming and remaining on the end of an electrode wire as the welding process continues. In a similar manner, a pulsed cycle with one or more increased parameters can be used to terminate the welding process, also preventing the ball forming and remaining on the electrode wire.

An arc welding apparatus includes: a welding-condition acquirer configured to acquire a welding condition; a heat-input calculator configured to calculate a required heat input corresponding to the welding condition; a frequency setter configured to set a smaller frequency for a short circuit condition and an arc condition corresponding to an increase in the required heat input; and a driver configured to repeatedly perform a process at the frequency, the process including advancing and retreating a welding consumable with respect to a workpiece to generate the short circuit condition and the arc condition.

A multiple welding method using at least two consumable electrodes which enables stable welding processes at the electrodes and also less heat input into the parent material compared with the multiple pulse welding method. At each of the at least two electrodes a welding process includes a short-circuit welding phase and a hot-welding phase with higher heat input into the parent material relative to the short-circuit welding phase, the short-circuit welding phase and the hot-welding phase periodically alternating, and for the short-circuit welding phases of the welding processes of the at least two electrodes to be temporally synchronized on the basis of at least one defined first synchronization event per short-circuit welding phase.

A hybrid welding power system includes: an AC/DC converter (101) to generate a rectified voltage from AC input power; a boost circuit (102) to generate a DC link voltage from the rectified voltage; an inverter (104) to generate a transformer input from the DC link voltage in accordance with a welding operation; an HF transformer (106) to receive the transformer input and generate a transformer output; a secondary rectifier (108) to rectify the transformer output to generate output welding power to be supplied to a weld output of the welding power system; and a battery power converter to couple a battery (112) to the DC link, the transformer (106), or the weld output to enable discharging of the battery (112) to the hybrid welding power system and enables charging of the battery (112) via the AC input, the DC link, the transformer (106), or the weld output in various implementations.

A welding-type system includes a wire feeder to provide an electrode wire to a welding-type torch. A welding-type power supply to provide power to one or both of the welding-type torch or the wire feeder. A controller is configured to control a sense voltage circuit to provide a sense voltage to charge a control capacitor, monitor a voltage feedback signal, determine that a wire feeder is activated based on a first change in the voltage feedback signal, control the switched mode power supply to provide a constant voltage output signal during a welding operation, control the switched mode power supply to provide the pulsed power output in response to completion of the welding operation, determine that the wire feeder is deactivated based on a second change in the feedback signal, adjust a pulse rate of the output signal to achieve an RMS value below a predetermined RMS level.

An arc welding method of a consumable electrode type generating arc between a tip end of welding wire and a to-be-welded portion by feeding welding wire to the to-be-welded portion of a base material while supplying welding current having average current of 300 A or larger to the welding wire, to weld the base material, includes: feeding the welding wire at a speed of the tip end being inserted into a space surrounded by a concave melted portion formed in the base material by the arc generated between the tip end and the to-be-welded portion; periodically alternating between a small current period where the welding current has a small average value and droplet is transferred from the tip end to a bottom part of the melted portion and a large current period where the welding current has a large average value and droplet is transferred from the tip end to a side part of the melted portion; and controlling the welding current in the large current period so that droplet transfer from the tip end to the side part is performed a plurality of times in each large current period.

In controlling an arc welding of consumable electrode type in which pulse welding and short-circuit welding alternately repeat, forward feeding and backward feeding of a welding electrode periodically repeat in a short-circuit welding period. The forward feeding of the welding electrode starts when a welding current is smaller than a base current immediately before a pulse period ends.

There is provided an arc welding control method for performing a forward/reverse feeding control of alternating a feeding rate of a welding wire between a forward feeding period and a reverse feeding period, and generating short-circuiting periods and arc periods to perform welding. The welding wire is fed forwardly upon starting the welding. The forward feeding is continued during a transient welding period from a time point at which the welding wire comes in contact with a base material and conduction of welding current is started to a time point at which convergence on a steady welding period is performed. The transient welding period is terminated at the short-circuiting period. The forward/reverse feeding control is started from the reverse feeding period after the termination of the transient welding period.