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《What Every Engineer Should Know About Welding》.pdf
WHAT EVERY
ENGINEER
SHOULD KNOW
ABOUT WELDING
From amperage ITHIN THE WELDING INDUS- primary variable in determining
TRY , THE TERM “WELDING heat input. Generally, an increase in
WPROCEDURE SPECIFICATION” amperage means higher deposition
to preheat, (or WPS) is used to signify the com- rates, deeper penetration, and more
there’s more to bination of variables used to make a admixture. The amperage flowing
certain weld. At a minimum the through an electrical circuit is the
WPS (or “Welding Procedure” or same, regardless of where it is mea-
welding simply “Procedure”) consists of: sured. It may be measured with a
process (Shielded Metal Arc Welding tong meter or with the use of an
procedures than [SMAW], Flux Cored Arc Welding electrical shunt. The role of amper-
[FCAW], etc.); electrode specification age is best understood in the context
meets the eye (AWS A5.1, A5.20, etc.); electrode of heat input and current density
classification (E7018, E71T-1, etc.); considerations. For CV welding, an
By Duane K. Miller, P.E. electrode diameter; electrical charac- increase in wire feed speed will
teristics ( (AC, DC+, DC-); base directly increase amperage. For
metal specification (A36, A572 Gr. SMAW on CC systems, the machine
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