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TABLE 26.1 AWS A5.1-69 and A5.5-69 Designations for Manual Electrodes
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listed in Tables 26.3 and 26.4. The NEMA specification also included the choice of imprinting the classification number on the electrode, as in Fig. 26.13b. Starting in 1964, new and revised AWS specifications for covered electrodes required that the classification number be imprinted on the covering, as in Fig. 26.13b. However, some electrodes can be manufactured faster than the imprinting equipment can mark them, and some sizes are too small to be legibly marked with an imprint. Although AWS specifies an imprint, the color code is accepted on electrodes if imprinting is not practical. Bare mild-steel electrodes (electrode wires) for submerged-arc welding are classified on the basis of chemical composition, as shown in Table 26.5. In this classifying system, the letter E indicates an electrode as in the other classifying systems, but
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TABLE 26.2 AWS A5.1-69 Electrode Designations for Covered Arc-Welding Electrodes
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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FIGURE 26.13 (a) National Electrical Manufacturers Association color-code method to identify an electrode s classification. (b) American Welding Society imprint method. (The Lincoln Electric Company.)
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here the similarity stops. The next letter, L, M, or H, indicates low, medium, or high manganese, respectively. The following number or numbers indicate the approximate carbon content in hundredths of a percent. If there is a suffix K, this indicates a silicon-killed steel. Fluxes for submerged-arc welding are classified on the basis of the mechanical properties of the weld deposit made with a particular electrode. The classification designation given to a flux consists of a prefix F (indicating a flux) followed by a two-digit number representative of the tensile-strength and impact requirements for test welds made in accordance with the specification. This is then followed by a
TABLE 26.3 Color Identification for Covered Mild-Steel and Low-Alloy Steel Electrodes
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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TABLE 26.4 Color Identification for Covered Low-Hydrogen Low-Alloy Electrodes
26.21 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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TABLE 26.5 AWS A5.17-69 Chemical-Composition Requirements for Submerged-Arc Electrodes
26.22 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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set of letters and numbers corresponding to the classification of the electrode used with the flux. Gas-shielded flux-cored electrodes are available for welding the low-alloy hightensile steels. Self-shielded flux-cored electrodes are available for all-position welding, as in building construction. Fabricators using or anticipating using the flux-cored arc-welding processes should keep in touch with the electrode manufacturers for new or improved electrodes not included in present specifications. Mild-steel electrodes for gas metal-arc welding of mild and low-alloy steels are classified on the basis of their chemical compositions and the as-welded mechanical properties of the weld metal. Tables 26.6 and 26.7 are illustrative. AWS specifications for electrodes also cover those used for welding the stainless steels, aluminum and aluminum alloys, and copper and copper alloys, as well as for weld surfacing. Shielding gases are consumables used with the MIG and TIG welding processes. The AWS does not write specifications for gases.There are federal specifications, but the welding industry usually relies on welding grade to describe the required purity. The primary purpose of a shielding gas is to protect the molten weld metal from contamination by the oxygen and nitrogen in air. The factors, in addition to cost, that affect the suitability of a gas include the influence of the gas on the arcing and metaltransfer characteristics during welding, weld penetration, width of fusion and surface shape, welding speed, and the tendency to undercut. Among the inert gases helium, argon, neon, krypton, and xenon the only ones plentiful enough for practical use in welding are helium and argon. These gases provide satisfactory shielding for the more reactive metals, such as aluminum, magnesium, beryllium, columbium, tantalum, titanium, and zirconium. Although pure inert gases protect metal at any temperature from reaction with constituents of the air, they are not suitable for all welding applications. Controlled quantities of reactive gases mixed with inert gases improve the arc action and metaltransfer characteristics when welding steels, but such mixtures are not used for reactive metals. Oxygen, nitrogen, and carbon dioxide are reactive gases. With the exception of carbon dioxide, these gases are not generally used alone for arc shielding. Carbon dioxide can be used alone or mixed with an inert gas for welding many carbon and low-alloy steels. Oxygen is used in small quantities with one of the inert gases usually argon. Nitrogen is occasionally used alone, but it is usually mixed with argon as a shielding gas to weld copper. The most extensive use of nitrogen is in Europe, where helium is relatively unavailable.
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