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 For AC-GTAW of Aluminum Alloys,... most of the significant advances focus on new ways to manipulate the AC wave form. These advances largely result from akrcompressortankshoustontexas using inverter-based power sources, which akrcompressortankshoustontexas allow a welder to extend the balance control, adjusting output frequency and independently controlling current in each AC halt cycle. New inverter-based GTAW machines extend EN balance control, allowing duration from 50 to 90 percent. Making the EN portion of the cycle last longer:* akrcompressortankshoustontexas Allows greater weld penetration* May permit increasing travel speeds by as much as 20 percent.* Narrows the weld bead* May permit akrcompressortankshoustontexas using a smaller-diameter tungsten electrode to more precisely direct the heat or deposit a narrower weld bead For flux-cored-arc welding, shops use CV or CC types, akrcompressortankshoustontexas 300 to 1,500 A, 25 to 50 V, rated 60- to 100-percent-duty cycle. CV types are more popular because wire-feed speed, set before welding, akrcompressortankshoustontexas controls welding current. Cc types require a variable-speed or voltage-sensing wire feeder.Gas-tungsten-arc welding (GTAW) requires a constant-current (AC or DC) power supply with a steep volt-amp curve to minimize current change for variation in voltage or arc length. They come rated to 1,500 A, 10 to 75 V, at 40- to 100-percent-duty cycle. Most GTAW power supplies come equipped with high-frequency circuitry for arc initiation and stabilization, gas valves, and cooling-water valves for high-current welding. High-frequency arc start is useful when the maximum open-circuit voltage allowed by NEMA standards, 80 to 100 V, will not establish and maintain a stable arc. 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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