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Power SuppliesWelding power supplies take alternating or direct current from a power line or portable generator and convert it to current usable at the welding arc:, Check National Electrical Manufacturers Association (NEMA) Standards Publication EW1, Electric Arc Welding Power Supplies, and manufacturers'' literature for construction and performance requirements of individual machines.Among types of power supplies, alternating-current (ac) transformers are least costly-most use 230 V single phase input power. Direct-current (DC) transformer-rectifiers convert AC to DC, using single- or three-phase power to produce constant voltage (cv) or variable voltage (vv). AC-DC transformer-rectifiers can AC and DC weld.

With the merger of R&B Falcon with Transocean Sedco Forex, the latter now owns 57 jackups, 15% of the world''s fleet. The next largest owners are ENSCO (38), Noble (33) and--following its merger with Marine Drilling-- Pride (33). Significant fleets are also owned by Rowan and Santa Fe (24 each), and Global Marine (23). And Diamond Offshore and Nabors list 14 and 13 rigs each. International owners with significant fleets include: Maersk (11), National Drilling Co. of Abu Dhabi (10), Oil & Natural Gas Corp. (8), and Petromar and CONDC with seven each. Including several "subsidiary" classifications, 59 owners are listed this year.

Though light in weight, Airbor magnetic drill has a powerful 1.6-hp air motor and 1,600-lb magnetic holding strength. With its extra rack, stroke length is extended to 10 1/4 in. Annular cutter capacity is up to 2 1/16 in. diam. Geared chuck adapter converts the unit to a standard drill press. The Slugger Air Force pneumatic drill, at 24 lbs, 6 1/4" high, is useful for confined area drilling. The drill''s features include a permanent magnet that turns on or off by air power, a cutter capacity of up to 1 1/16" diameter x 3/4" depth and the ability to use ShortSlugger cutters and frame cutters. These cutters'' geometry allows the operator to drill multi-layered truck frames in a single pass.

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