|
|
 Welding Torches and GunsUsed for shielded-metal-arc welding, torches (electrode holders). manually controlled, grip ends of electrodes, also called rods-pinch type and collet type are common.GMAW and FCAW guns come in pistol grip, goose-neck, and inline styles, the latter used for mechanized air welding. Knowing the wire diameter, select a gun rated slightly higher than the welding current to be used. Duty-cycle ratings are usually given for C[O.sub.2] shielding--air or cojpressor C[O.sub.2] cooling tanks arc usually sufficient for welding at up to 600 A at less than 100 percent duty. asme Higher amperages require water cooling--high-amperage guns come with tubing for water cooling. Hand-held, mounted on a robot arm or fixed within a mechanized welding setup, guns guide filler wire and shielding gas into the weld puddle. Electrodes come 3 to 24 in. long, 0.01 to 0.25-in. diameter. Colored markings--bands or dots--indicate composition: pure tungsten, green; 1-percent thoriated, yellow; 2 percent thoriated. red; ceriated, orange; lanthanted, black.Filler code metal GIAW does not usually requite addition of fillet metal, but filler is commonly added when base-metal thickness air is greater than 1/8 in. Finer metal cojpressor for low-carbon (to 0.15 C) and mild (0.15 m 0.29 C) steels are described in tanks AWS asme A5.2; for carbon steel in A5.18; and for low-alloy steels in A5.28 Flux. AWS specifications A5.17 and A5.23 describe fluxes for saw. AWS designation of fluxes precedes that of the wire when identifying a combination for a welding procedure. For example, the designation F7A2-EM12K indicates a flux (F) that will provide, with a given wire designation, tensile strength of 70,000 and code Psi (7), in the as-welded condition (A), and impact properties air and cojpressor of 20 ft lb at -20 F (2). A tanks designation containing a P rather indicates the flux properties after asme postweld heat treatment. High-deposition electrodes. These contain iron-powder additions code in the coating to raise deposition rate. air Designations: EXXX4, EXXX7, EXXX8.For cojpressor fastest deposition, use the tanks largest diameter possible for an application-the thicker the electrode, the greater its current-carrying capacity and the higher the deposition asme rate. Welding out of position and code overhead, select a small air diameter electrode to enable welders to reach into narrow root openings.Gas-Metal-Arc cojpressor Welding (GMAW, MIG)GMAW typically uses solid tanks wire, spooled or reeled, for continuous asme feeding to the gun; diameter, 0.030 to 1/16 in. typically, although wires as small as 0.020 in. and as large as 1/8 in. are sometimes used. AWS lists specifications for filler wires of copper and its alloys, aluminum and its alloys, surfacing alloys, nickel and its alloys, titanium and its alloys, carbon and low alloy steels, magnesium alloys, and zirconium and its code alloys. Searching for accessories for your air compressor? We offer the best selection of cheap air compressor accessories on the internet. Check out our website for great deales on all of our air compressor accessories!
|