ANSWERS: 1
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Welding electrode numbers are four- to five-digit numbers that represent the minimum tensile strength the welding rod produces, the position of the electrode, the electrode's coating and the type of current needed.
Source:
"Pocket Welding Guide;" Hobart Institute of Welding Technology; 1993
Metal Web News: Basic guide to electrodes
Lincoln Electrica: American Welding Society classifications
Resource:
Lincoln Electric: Knowledge Articles
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