A power conversion assembly for use in a welding power supply includes a power magnetics module and a power electronics module. The power magnetics module includes at least one transformer disposed on a first wind tunnel housing. The power electronics module is separate from and electrically coupled to the power magnetics module. The power electronics module includes switching circuitry and one or more heat sinks to remove heat from the switching circuitry. The switching circuitry and the heat sinks are disposed on a second wind tunnel housing coupled to the first wind tunnel housing.

Systems and methods to aid a welder or welding student. A system may provide a real-world arc welding system or a virtual reality arc welding system along with a computerized eyewear device having a head-up display (HUD). The computerized eyewear device may be worn by a user under a conventional welding helmet as eye glasses are worn and may wirelessly communicate with a welding power source of a real-world arc welding system or a programmable processor-based subsystem of a virtual reality arc welding system.

An example welding type system includes: a welding power circuit having a control input and a welding type power output; a feedback circuit configured to provide feedback regarding the welding type power output or a weld produced using the welding type power output; and a controller connected to the feedback circuit, wherein the controller includes a parameter setting module and a process selection module, the process selection module configured to automatically select a welding process from a plurality of welding processes based on the feedback from the feedback circuit or one or more welding parameters set by the parameter setting module.

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.

Power systems and methods of controlling an engine driven air compressor include an air compressor driven by an engine via a clutch. A first pressure sensor configured to sense a pressure level at an outlet of the air compressor. An inlet valve configured to close in response to the first pressure sensor sensing a pressure level above a first pressure level. In addition, a second pressure sensor to sense a pressure level below a second pressure level at a housing of the air compressor, wherein the clutch is configured to disengage in response to the second pressure level, wherein the first pressure level is higher than the second pressure level.

Systems and methods to reduce magnetic flux in a switched mode power supply are disclosed. An example welding-type power supply includes a switched mode power supply, comprising: a transformer configured to transform an input voltage to a welding-type voltage; a capacitor in series with a primary winding of the transformer; switches configured to control a voltage applied to a series combination of the primary winding of the transformer and the capacitor; a comparator coupled to the transformer and configured to compare the welding-type output voltage to a threshold voltage; and a flux accumulator to determine a net flux in the transformer based on the voltage applied to the series combination of the primary winding of the transformer and the capacitor.

An arc welding control method, using shield gas containing 60 volume percent or more of inert gas, is configured to: alternately switch the wire feeding speed between forward and backward feeding; repeat a short-circuiting period and an arc period; and switch a first, second and third arc period over time during the arc period, where a first arc current Ia1 is fed for the first arc period, a second arc current Ia2 is fed for the second arc period, and a third arc current Ia3 is fed for the third arc period such that Ia1>Ia2>Ia3 holds. The first arc current Ia1 is set to a critical current value or more. The first arc period is so short that a droplet transfer does not occur. The second arc current Ia2 is less than the critical current value.

A portable stud welder apparatus is provided for welding a stud onto a work piece. The portable stud welder apparatus includes a housing and an energy storage device. A weld stud gun that is configured to hold a weld stud is electrically connected to the energy storage device for receiving energy from the energy storage device to pass a current through the stud and the work piece to form a weldment. At least one battery of the lithium ion type that is removeably coupled to the housing to establish an electrical connection with said energy storage device and provide energy to the energy storage device.

A method and apparatus for providing welding-type power derives motive power from a variable speed engine and driving a variable frequency generator with the motive power to provide a generator output. The generator output is preregulated to provide an intermediate signal, and the preregulating is controlled at least in response to feedback indicative of the welding-type output power. Welding-type output power is derived from the bus, and controlled at least in response to the welding feedback. Auxiliary output power is also derived from the bus, and controlled at least in response to feedback indicative of the auxiliary output power. The speed of the engine is controlled at least in response to one of the auxiliary feedback and the welding feedback. Energy produced by the engine that is not used as an output is stored by batteries. When the output exceeds the energy generated, the difference is supplied by the batteries.

A welding power supply having an adjustable cover is disclosed. The welding power supply includes an enclosure housing an engine, a porous radiator thermally coupled to the engine, and a fan configured to propel air through the radiator. A ventilation opening is in fluid communication with the fan and radiator. The fan is configured to move heated air along an air path and out of the ventilation opening. The air may be heated by the welding power supply components (e.g. engine, radiator, charge air cooler, oil cooler, compressor, generator, weld circuitry, and/or other components), for example. The adjustable cover is positioned over the ventilation when in a fully closed and/or partially open/closed position. The adjustable cover may be moved between fully closed, partially open/closed, and fully open positions. The amount of air that is allowed to exit the enclosure, and the amount of air that is recirculated within the enclosure, may be altered by adjusting the position of the adjustable cover.