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TIPUse the jackhammer to crack the concrete, not to punch holes. If the chisel bores into the concrete without cracking it, stop and try another spot. Getting a stuck chisel out of solid concrete is a cursing waste of time.Rent the jackhammer''s smaller cousin, a "chipping hammer" ($30 to $40 per day), for lighter tasks: breaking up a few square feet of basement floor for plumbing work or chipping ceramic tile off a concrete floor.Brad nailerCOST: $50 per day with compressorBENEFITS: Better results with less time and effort.

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 gas 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.