By T M Mustaleski; Rakesh Gupta; Rosalinda O'Neill; American Welding Society
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Extra info for American Welding Society (AWS) user's guide to filler metals
Since all Cr-Mo electrodes produce weld metal which will harden in still air, both preheat and PWHT are required for most applications. No minimum notch toughness requirements have been established for any of the Cr-Mo electrode classiﬁcations. While it is possible to obtain Cr-Mo electrodes with minimum toughness values at ambient temperatures down to 32°F [0°C], speciﬁc values and testing must be agreed to by the supplier and the purchaser. 1 E70XX-B2L [E49XX-B2L] and E80XX-B3L [E55XX-B3L] Electrodes.
12%, strength increases and permits these Ni steel electrodes to be classiﬁed as E80XX-CX [E55XX-CX]. However, with lower levels of carbon, low-temperature toughness improves to match the base-metal properties of nickel steels, such as ASTM A 203 Gr. E, ASTM A 352 LC3 and LC4 classiﬁcations. Thus, the intended application and the needed mechanical properties determine whether or not “L-Grades” should be selected. Many low-alloy steels require postweld heat treatment to stress relieve the weld or temper the weld metal and heat-affected zone to achieve increased ductility.
18M. The letter “S” designates a solid electrode or rod. The letter “C” designates a composite electrode. The digit following the hyphen, 2, 3, 4, 6, 7, G, or GS, indicates the chemical composition and/or impact testing requirements speciﬁed in the speciﬁcation. In the case of some composite stranded and metal-cored electrodes, the letter “M” or “C” will follow, indicating the type of shielding gas. The addition of the letter “N” as a sufﬁx to a classiﬁcation indicates that the electrode is intended for certain very special welds in nuclear applications.