Power electronics, including welding-type power supplies may have a switched mode power supply configurable in two or more topologies. Detection circuitry of the power electronics may determine the configured topology of the switched mode power supply and the input voltage supplied to the power electronics. The detection circuitry and/or control circuitry of the power electronics may verify that the configured topology of the switched mode power supply corresponds to the supplied input voltage, and may indicate an error if the configured topology does not correspond to the supplied input voltage.

Welding power supplies, wire feeders, and systems to measure a weld circuit resistance via communications over the weld circuit are disclosed. An example welding-type power supply includes: a power converter configured to: convert input power to output a current pulse via a weld circuit; and convert the input power to output welding-type power via the weld circuit; a voltage monitor configured to measure a power supply output voltage of the current pulse; a receiver circuit configured to receive, via the weld circuit, a communication comprising a second voltage measurement; and a controller configured to: determine a resistance of a portion of the weld circuit based on the power supply output voltage measurement, the second voltage measurement, and a weld circuit current measurement; and control the power converter to convert the input power to output the welding-type power based on a weld voltage setpoint and the impedance.

Methods and apparatus to provide welding power are disclosed. An example welding-type power supply includes: a transformer having first and second secondary windings; switching elements configured to control current flow from the first and second secondary windings to an output; and a control circuit configured to control the switching elements to selectively output a positive output voltage or a negative output voltage without a separate rectifier stage by selecting, based on an output voltage polarity, a first subset of the switching elements to perform rectification.

Systems and methods to provide welding-type arc starting and stabilization with reduced open circuit voltage are disclosed. An example welding-type power supply includes: power conversion circuitry configured to convert input power to welding-type power; and control circuitry configured to: control the power conversion circuitry to output a voltage pulse at a first voltage; determine whether the power conversion circuitry outputs current during the voltage pulse; in response to determining that there is less than a threshold output current during the voltage pulse, control the power conversion circuitry to turn off an output or output a second voltage that is less than the first voltage; and in response to determining that the power conversion circuitry outputs at least the threshold output current during the voltage pulse, control the power conversion circuitry to output the welding-type power.

A system and method to correct for deposition errors during a robotic welding additive manufacturing process. The system includes a welding power source to sample instantaneous parameter pairs of welding output current and wire feed speed in real time during a robotic welding additive manufacturing process while creating a current weld layer of a 3D workpiece part. An instantaneous ratio of welding output current and wire feed speed are determined for each instantaneous parameter pair. A short term running average ratio is determined based on the instantaneous ratios. A relative correction factor is generated based on at least the short term running average ratio and is used in real time while creating the current weld layer to compensate for deviations in a deposit level from a desired deposit level for the current weld layer.

A method of operating a welding power supply during a welding process in which an electric arc between a consumable electrode and a work piece is generated while feeding the consumable electrode and moving the arc in relation to the work piece along a welding track, wherein a transition between a DC power output of the welding power supply and an AC power output of the welding power supply, or vice versa, is made without interruption of the welding process.

A welding-type power supply includes a controller, a preregulator, a preregulator bus, and an output converter. The controller has a preregulator control output and an output converter control output. The preregulator receives a range of inputs voltages as a power input, and receives the preregulator control output as a control input, and provides a preregulator power output signal. The preregulator includes a plurality of stacked boost circuits. The preregulator bus receives the preregulator output signal. The output converter receives the preregulator bus as a power signal and receives the output converter control output as a control input. The output converter provides a welding type power output, and includes at least one stacked inverter circuit.

A welding system includes a multi-process power supply, a TIG torch, and a TIG power pin for connecting the TIG torch to the multi-process power supply. The multi-process power supply has a power output connection for a MIG torch and a controller. The Controller is configured to command shielding gas and welding current to be provided to the power output connection, and the power output connection is configured to provide the shielding gas and the welding current to a MIG torch when the MIG torch is connected to the power output connection. The TIG power pin connects the TIG torch to the power output connection such that the power output connection is configured to provide the shielding gas and the welding current to the TIG torch. The controller is configured such that at least one of the shielding gas and the welding current is not provided to the TIG torch through the power output connection until a user engages a control member.

Disclosed are apparatus and systems to determine voltage measurements in welding-type applications to facilitate control of welding-type processes. Disclosed systems include a remote operations interface configured to facilitate voltage measurements in welding-type applications and facilitate communication between a welding-type power supply and a wire feeder.

A method and system for internally determining, within a welding power supply, the energy input into a weld during a welding operation. The method includes determining a total energy input into the weld during a first time period, and determining a length of the weld made during the first time period.