By T M Mustaleski; Rakesh Gupta; Rosalinda O'Neill; American Welding Society
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Additional info for American Welding Society (AWS) user's guide to filler metals
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. These welds are found in the core belt region of the reactor vessel.
Purchaser and user should determine from the supplier what the description and intended use of the electrode is. 7 E(X)XXXXM(1) (Military Similar) Electrodes. These low-hydrogen electrodes were originally designed for military applications such as welding HY80 and HY100 type steels. To achieve desired weld-metal properties and soundness, these electrodes have small alloy additions (especially some Ni) and require careful control of moisture in the electrode covering. It is important that moisture levels in the coating be maintained during electrode manufacture, packaging, transport, and site storage.
No single temperature or reasonable range of temperatures can be chosen for classiﬁcation tests, which will be representative of all of the conditions encountered in production work. Properties of production welds may vary accordingly, depending on the particular welding conditions. Weld-metal properties may not duplicate, or even closely approach, the values listed and prescribed for test welds. For example, ductility in single-pass welds in thick base metal made outdoors in cold weather without adequate preheating may drop to little more than half that required herein and normally obtained.
American Welding Society (AWS) user's guide to filler metals by T M Mustaleski; Rakesh Gupta; Rosalinda O'Neill; American Welding Society