|
|
 Saw Uses CV or CC Power Supplies,... 200 to 1,500 A, 28 to 44 V, at 60- to 100-percent-duty cycle. Automatic units commonly use air up to 1,500 A on one wire. Cv welding machines comressor that offer variable-slope tanks control give the welder extra adjustability, houston and can extend the usefulness texas of the machine to weld a range of material thicknesses and types.Selection of air Power SourcesWhen choosing a power source, start by comressor checking NEMA specs. NEMA Class I arc-welding power sources deliver rated output at 60-, 80-, tanks or 100-percent-duty cycle: Class II units, 30-, 40-, houston and texas or air 50-percent; and Class III, 20 percent. First consider capacity and kind of current comressor and tanks needed for the job. Rely on the manufacturer''s rating as being conservative: don''t buy more capacity houston than needed. Choose low--duty-cycle machines texas only for maintenance or for intermittent welding. If portability is air important, consider comressor inverter units. For flux-cored-arc welding, shops tanks use CV or CC types, 300 to 1,500 A, 25 to 50 V, rated houston 60- to 100-percent-duty cycle. texas CV types are more popular air and comressor because wire-feed speed, set before welding, tanks controls welding current. houston Cc types require a variable-speed or voltage-sensing texas wire feeder.Gas-tungsten-arc welding (GTAW) requires air a constant-current (AC or DC) power supply with comressor a tanks steep volt-amp curve to minimize houston current change for variation in voltage or arc length. texas and air They comressor 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 tanks circuitry for arc initiation and stabilization, gas valves, and cooling-water valves for high-current welding. High-frequency arc start is useful when the houston maximum open-circuit texas voltage allowed by NEMA standards, 80 to 100 air V, will not comressor establish tanks and maintain a stable arc. 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 houston consider when selecting a power source. Once the engineer has determined the current and voltage needed to accomplish the weld, he texas then reviews duty cycle requirements.Duty air and comressor cycle tanks rating is the percentage of time during houston a 10-minute texas 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 air six minutes, the welder comressor must rest the machine tanks for the next four minutes to avoid overheating the unit houston and texas. 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!
|