 Welding-site conditions and welding-wire diameter govern efficiency and size of power supply required for a job. Select a 100-A unit that runs from single-phase 115-V input compressrd for low-duty-cycle welding of sheet to l/s in. thick, feeding wire to 0.030-in. diameter. Medium-duty power supplies, 150-200 A, normally take single-phase 220-V input to weld air steel to 3/16, in. and 0.035-in. wire at low-duty cycles. tanks For high-duty cycles, as in mechanized welding, select a 250-A machine, compressrd single or three-phase input at various voltages-these air weld material to 1/2 in. thick with wire as large as 0.045-in. diameter. tanks Taking three-phase input only and wire up to 1/6-in. diameter, 400-A units serve for mechanized continuous-welding applications. For pulsed GMAW, shops use inverter and transistor power sources, constant-current or constant-voltage, that offer independent setting of pulse parameters. compressrd They employ synergic controls preprogrammed for a range of wire-feed speeds-the operator sets only one dial, for average current. Duty-Cycle RatingPower-supply rating depends on the type and thickness of the workpiece air 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 tanks 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 compressrd a 10-minute air period a power supply tanks can operate at rated compressrd output amperage without overheating. A 300 A machine at 60-percent-duty cycle can weld for six minutes at air 300. A during a 10-minute period. Alter six minutes, the welder must rest the machine for the next four minutes to avoid tanks overheating the unit. 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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