air compresslr tanks asme code

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Welding Torches and GunsUsed for shielded-metal-arc welding, air torches (electrode compresslr 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, tanks and inline styles, asme the latter used for mechanized welding. Knowing the wire diameter, select code 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 C[O.sub.2] cooling arc usually sufficient for air welding at up to 600 A at less than 100 percent duty. Higher amperages require water cooling--high-amperage compresslr and tanks guns come asme with tubing for water cooling. Hand-held, mounted on a robot arm or fixed within a code mechanized welding setup, guns guide filler wire and shielding gas into the weld puddle.

GTAW torches come air-cooled and air water-cooled. Their heads align in-line with the body or at 90, 120, or 135 degrees to it. Nozzles, specified compresslr by inside diameters, run 1/4 to 5/8 in. Vendors offer special tanks designs: asme longer to give improved accessibility to the weld joint, or wider to extend shielding gas coverage.Saw guns come in three-types-side, concentric, and deep-groove flux delivery.In oxyfuel welding (ofw), heat comes from burning gases, rather than code arcs, Torches hold separate tubes air and compresslr for fuel gas and oxygen, blended in a mixer assembly. A torch assembly comprises a handle (aluminum, stainless steel, or brass); tanks a mixing chamber; asme and a brass welding tip or cutting head. Light-duty torches weld sheer metal to 3/16, in. thick; medium, to code 1/2 in.; heavy, 1/2 in. and up.

Low-hydrogen types. These basic-coated air and compresslr electrodes, tanks EXX15, EXX16, EXX18, EXX28, and EXX48, are formulated asme with low moisture-retaining coatings and manufactured to contain low levels of hydrogen. Hydrogen-controlled and code electrodes minimize risk of air hydrogen-induced cold cracking compresslr and tanks when welding high-tensile steels on restrained asme and and code structures. Fabricators use these electrodes to reduce or avoid the need for pre- or air postweld compresslr heat tanks and asme and treatment to drive hydrogen from weld metal. code Weldmetal diffusible hydrogen air content compresslr and tanks varies from 1 to 16 ml/100 g. Optional designators H16, H8, and H4 set decreasing limits on hydrogen content in deposited asme weld metal. An optional electrode designator, ''R'', indicates an electrode that is moisture code resistant; it will not absorb water in excess of a specified limit after exposure to humidity. Low-hydrogen electrodes should be used in dry condition and may require baking after exposure to the atmosphere.

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