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For special applications, manufacturers offer metal-cored wires for GMAW. These are composite electrodes comprised of a metal sheath with a powder-metal core. They are often confused with flux-cored wires, which form a slag that completely covers the weld bead face; metal-cored wires produce very little slag. A major advantage of metal-cored wires is the ability to manufacture specialized alloy compositions not easily available or producible in solid wire fore1. Modifying the composition of the powder-alloy core allows the wire manufacturer to customize wire formulations to metallurgical, compositional, or physical properties per customer demand. Horizontal-fillet welds made with metal-cored GMAW can deposit weld metal at rates up to 20 percent higher than with solid wire. Alloying elements, such as silicon, in the powder-metal core improve sidewall wetting and reduce weld-bead convexity by reducing surface tension of the molten weld pool. For this reason, flat and horizontal welds deposited with metal-cored wires have better appearance than weld metal deposited with flux cored and solid wires. Compared to solid wires, metal-cored wires also result in higher current density, for increased penetration; a wider operating window with respect to welding-process variables: better sidewall melting; and less lack of fusion.

Response rate, header height, and row unit height can be conveniently adjusted on-the-go from the cab. Simple buttons are used to raise and lower the unit, and the old levers and mechanical linkages have all been replaced with state-of-the-art electronic controls. Row-Trak Guidance is also available on the new head. With this system, the operator will automatically stay on the row without constant steering adjustments. Simply line-up the stripper with the rows, hit the Row-Trak Guidance switch, and the system will take over, steering the stripper and keeping it on the row.

10,000 x 3, Hydril GK 7 1/16 x 10,000; Cameron Udouble/single 13 5/8", 5,000; Koomey unit 21 bottles& remote controls.CRANES: Two BMC 1,000, 40 tons x 25''.MOORING: Two 10-ton, one 5-ton anchor w/1 1/2" wire rope.REMARKS: Sedco Forex is a partner in Arabian Drilling Co.WORK AREA: Arabian Gulf.ARABDRILL 17RIG DESIGN: Marathon LeTourneau 82-SC-CCONSTRUCTION: Davie Shipbuilding, Canada, 1981.PERFORMANCE: Water depth--250''; Drilling depth--20,000''.QUARTERS: 76 parsonsHULL: 207''x 176''x 20''.VARIABLE LOAD: 1,775