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 * Reduces the size of the etched zone for improved cosmetics.Less EN time improves cleaning action to remove heavier oxidation, lessens penetration, and widens the bead profile.Inverter-based machines also let operators adjust welding-output frequency from 20 to 250 Hz. Decreasing frequency products a broader arc aircompressortqnks cone, which widens the weld-bead aircompressortqnks profile aircompressortqnks and better-removes impurities from the surface of the workpiece. It also transfers the maximum aircompressortqnks amount of energy to the workpiece, ideal for work requiring aircompressortqnks heavy metal deposition.Increasing frequency produces a tight, focused arc cone. This narrows the weld bead, helpful when welding in corners and on root passes and fillet welds. Independent amperage control of the EN and EP portions of the AC cycle allows the operator to fine-tune the amount of energy directed into the workpiece, as well as take heat off of the tungsten electrode. A basic, professional-quality AC GTAW power supply lets the operator adjust for variables: amperage, aircompressortqnks balance control, and shielding-gas pre-flow and post-flow time. 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 aircompressortqnks 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 aircompressortqnks high-frequency aircompressortqnks starting. 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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