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 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 steel to 3/16, in. and 0.035-in. wire at 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 and transistor power sources, constant-current or constant-voltage, that offer independent setting of pulse parameters. They employ synergic controls preprogrammed for a range of wire-feed speeds-the operator sets only one dial, for average current.

Wheel sizes range from 4 X 2 in. to 8 X 2 in. with a choice of roller, Delrin, or precision ball bearings. Typical applications include automotive plants, tire plants, food processing, floor scrubbing equipment, and aircraft/aerospace plants. Swivel nylon casters feature thermoplastic rubber tires bonded to a polypropylene wheel center. Double-sealed precision ball bearings in the swivel head and wheel hub deliver smooth operation. The casters withstand corrosion and temperatures to 230[degrees]F. They are available in wheel diameters of 100, 125, 150, and 200 mm with load capacities from 100 to 130 kg. They can be ordered with bolt holes, threaded stems, fittings for round or square tubes, fixed pins or plate mountings, and with or without brakes. A line of electrically conductive nylon casters is also available.

With all the controls located on the handlebars and user-friendly instructions in clear sight, even less experienced operators, such as those encountered in the rental industry, can easily and safely operate the MPB16, he said. The buggy has a 16 cu.ft. load capacity, a polyethylene bucket (with a steel bucket available as an option) with a molded splash guard and a top-mounted, top-fill 13 gal. fuel tank, which allows all-day operation.Air-cooled Honda engines also have homes in the new Magnum MWT500 and MWT1000 water trailers, which have 500 and 1000 gal. capacities, respectively. The units use a 2 in. Tsurumi centrifugal pump powered by a four-stroke Honda engine rated 4 hp. A 2 in. x 4 in. welded tubular steel flame fully supports a full steel cradle that supports a 3/8 in. thick polyethylene water tank. For convenience and efficiency, all engine, pump and valve controls are operable from the driver''s side of the trailer.

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