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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. IngersollRahdAirCompressorStartUpKitModel20103420 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 rest the machine IngersollRahdAirCompressorStartUpKitModel20103420 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 work, the arc starts softly and the machine switches to the set weld-current 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, 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 deep-groove IngersollRahdAirCompressorStartUpKitModel20103420 flux delivery.In IngersollRahdAirCompressorStartUpKitModel20103420 oxyfuel IngersollRahdAirCompressorStartUpKitModel20103420 welding (ofw), heat comes from IngersollRahdAirCompressorStartUpKitModel20103420 burning gases, rather than arcs, Torches hold separate tubes for fuel gas and oxygen, blended in a mixer assembly. A torch assembly comprises a handle (aluminum, stainless IngersollRahdAirCompressorStartUpKitModel20103420 steel, or brass); a mixing chamber; and a brass welding tip or cutting head. Light-duty torches weld sheer metal to 3/16, IngersollRahdAirCompressorStartUpKitModel20103420 in. thick; medium, IngersollRahdAirCompressorStartUpKitModel20103420 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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