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 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 for low-duty-cycle aircompressornoses welding of sheet to l/s in. thick, feeding wire to 0.030-in. diameter. Medium-duty aircompressornoses power aircompressornoses supplies, 150-200 A, normally take single-phase 220-V input to weld aircompressornoses steel to 3/16, in. and 0.035-in. wire at aircompressornoses low-duty cycles. For high-duty cycles, as in mechanized welding, select a 250-A machine, single or three-phase input at various voltages-these weld material to 1/2 in. thick with wire as large as 0.045-in. diameter. 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 aircompressornoses and transistor power sources, constant-current or constant-voltage, that offer independent setting of pulse parameters. They aircompressornoses employ synergic controls aircompressornoses preprogrammed for a range of wire-feed speeds-the operator sets only one dial, for average current. Welding Torches and GunsUsed for shielded-metal-arc aircompressornoses welding, torches (electrode holders). manually controlled, grip ends of electrodes, also called rods-pinch type and collet type are common.GMAW and FCAW guns come in pistol grip, goose-neck, and inline styles, the latter used for mechanized welding. Knowing the wire diameter, select a gun rated slightly higher than the welding current to be used. Duty-cycle ratings are usually given for C[O.sub.2] shielding--air or C[O.sub.2] cooling arc usually sufficient for welding at up to 600 A at less than 100 percent duty. Higher amperages require water cooling--high-amperage guns come with tubing for water cooling. Hand-held, mounted on a robot arm or fixed within a mechanized welding setup, guns guide filler wire and shielding gas into the weld puddle. 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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