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 Duty-Cycle RatingPower-supply rating depends on the type and thickness of the workpiece and the length of time it takes to deposit the longest weld on the thickest material. Duty cycle is the key factor to consider when selecting a power source. Once the engineer has determined the current and voltage needed to accomplish the weld, he then reviews duty cycle requirements.Duty cycle rating is the percentage of time during a 10-minute period a power supply can operate at rated output amperage without overheating. A 300 A machine at 60-percent-duty cycle can weld for six minutes at 300. A during a 10-minute period. Alter six minutes, the welder must IbgersollRandAirCompressorStartUpKitModel20103420 rest the machine for the next four minutes to avoid overheating the unit. Production vs. repair applications In general, production applications require high-duty-cycle power supplies, and repair applications can use low-duty-cycle portable units.Lift-arc GTAW Many DC power supplies are equipped with a list-start feature for, a variation of scratch starting, GTAW welding. When the welder touches the tungsten electrode to the workpiece, a small amount of current--15-20 A--flows. When he lifts the electrode from the IbgersollRandAirCompressorStartUpKitModel20103420 work, the arc starts softly IbgersollRandAirCompressorStartUpKitModel20103420 and the machine switches to the set weld-current IbgersollRandAirCompressorStartUpKitModel20103420 value. This low-current starting minimizes weld contamination caused by touching the tungsten to the workpiece and eliminates the need for high-frequency starting. GTAW torches come air-cooled and water-cooled. Their heads align in-line with the body or at 90, 120, or 135 degrees to it. Nozzles, IbgersollRandAirCompressorStartUpKitModel20103420 specified by inside diameters, run 1/4 to 5/8 in. Vendors offer special designs: longer to give improved accessibility to the weld joint, or wider to extend shielding gas coverage.Saw guns come in three-types-side, concentric, and IbgersollRandAirCompressorStartUpKitModel20103420 deep-groove flux delivery.In oxyfuel welding IbgersollRandAirCompressorStartUpKitModel20103420 (ofw), heat comes from burning gases, rather than arcs, Torches hold separate tubes for fuel gas and oxygen, blended in a mixer assembly. A torch assembly comprises IbgersollRandAirCompressorStartUpKitModel20103420 a handle (aluminum, stainless steel, or brass); a mixing chamber; and a brass welding tip or cutting head. Light-duty IbgersollRandAirCompressorStartUpKitModel20103420 torches weld sheer metal to 3/16, in. thick; medium, to 1/2 in.; heavy, 1/2 in. and up. Searching for accessories for your air compressor? We offer the best selection of cheap air compressor accessories on the internet. Check out our website for great deales on all of our air compressor accessories!
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