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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. * I use a 15-kilowatt scott PTO Onan generator to run the house during extended power outages. I bought lawn it used last year for $1,100. I also have a 4.5-kilowatt engine-driven generator with welder capabilities.* I bought a Generac 45/60-kilowatt PTO generator for my hog farm because I got tired of my electric company not wanting to replace a fuse in a timely manner.* We use two Onan 45-kilowatt generators with Ford engines. They have been very reliable. They cost $15,000 each, plus $1,000-$2,000 for switches, and even more for installation and hookup. It is expensive, but we need the large kilowatt output to power 2 acres of greenhouse production. Damage to a specimen, or to the air scribe itself, can occur in several ways. Almost always it is due to operator error. The air scribe is very powerful and quite capable of quickly boring into mineralized bone or shell--with dire consequences. The reciprocating, or in-and-out, movement of the tool can actually pull the bit through the specimen in a series of millisecond-long bites that can leave the operator in a panic. The secret is to completely familiarize yourself with surface texture, color, and physical properties of both the fossil and the matrix--these are unique and vary greatly between specimens. Let the machine do the work. Knowledge of texture and color lets you know when to lighten up and pull away, and, for the most part, the movement of the chisel tip without any help except guidance from the operator is sufficient to reduce matrix to a fine debris. This is perhaps the most difficult technique to learn because it is human nature to think that force from our own muscles will make the job faster. Quite the contrary, the application of too much pressure only ensures that your lab will be filled with an incessant whining, your air scribe life span will be considerably reduced, and you may snap off fairly expensive chisel bits. In addition, because air scribes are so powerful, the bit should never be used as a lever. It is the reciprocating movement of the tip of the bit that effectively breaks apart the rock matrix. Wedging the bit into the rock, twisting, or levering off larger chunks not only breaks chisel bits, but also rapidly transforms your air scribe into a useless paperweight. With proper care, common sense, and regular lubrication, a pneumatic air scribe will last for years and will enable you to prepare fossils from nearly any matrix. Lab technicians are mowers also finding that air scribes enable them to develop fossils in a way never before available to them, bringing out details of specimens impossible with older, more traditional technologies.
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