|
|
 5. Joint design and material thickness. Some electrodes create aircompreasortankshoustontexas an arc that penetrates deeply, performing well on thick sections with narrow grooves or no bevel. Poor fit-up calls for electrodes that can bridge wide gaps.6. Efficiency. Meeting all other conditions, engineers select the electrode that gives highest deposition rate. For heavy-section joints, use powder-metal-addition fillers.Designating electrodes for carbon and low-alloy steels, following the prefix E'', to signify a SMAW electrode, come two or three digits to indicate minimum tensile strength in 1,000 PSI units; a digit indicating usable current aircompreasortankshoustontexas and electrode-coating type; and, in some cases, a hyphen followed by a letter and number suffix to denote weld metal composition. Example: E7010-A1 is a aircompreasortankshoustontexas SMAW electrode (E), of 70,000-psi tensile strength (70), for use in all welding positions (1), aircompreasortankshoustontexas having a high-cellulose-sodium aircompreasortankshoustontexas coating tin use with DCEP (0). -A1 indicates a particular composition listed in the A5 specification. A-1 suffix, as in 7018-1, indicates high impact toughness at a temperature lower than specified for a standard E7018 electrode. Electrodes come 3 to 24 in. long, 0.01 to 0.25-in. diameter. aircompreasortankshoustontexas Colored markings--bands or dots--indicate composition: pure tungsten, green; 1-percent thoriated, yellow; 2 percent thoriated. red; ceriated, orange; lanthanted, black.Filler metal GIAW does not usually requite addition of fillet metal, but filler is commonly added when base-metal thickness is greater than 1/8 in. Finer metal for low-carbon (to 0.15 C) and mild (0.15 m 0.29 C) steels are described in AWS 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 aircompreasortankshoustontexas Psi (7), in the as-welded condition (A), and impact properties of 20 ft lb at -20 F (2). A designation containing a aircompreasortankshoustontexas P rather indicates the flux properties aircompreasortankshoustontexas after postweld heat treatment. 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!
|