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"I have spent the better part of my adult life developing and manufacturing motorized products from go-karts and lawn equipment to pressure washers," Brister said in a May 8 letter to dealers. "Beginning with Brister''s Thunder Karts, a company started by my father in 1959, I have helped lead the karting industry from the garage-built toys of the ''60s to today''s highly engineered off-road vehicles, I take great pride in the fact that many of the designs, features and safety improvements I introduced are still used on the finest karts in the marketplace.

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.