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Flashcards in Manual Metal Arc Welding Deck (3)
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1

describe the principles of MMA welding

electrode consists of steel core wire and a covering flux containing alloying elements

arc melts parent metal and electrode

flux melts with core wire and flows over surface of pool to form slag.

2

what are the functions of slag

minimizing impurities in the weld

form coating which protects weld from oxidization

prevent cracking and brittleness

3

describe multi run welds

produces a finished weld in structure better than single run welds

each run of welds has a post heating effect on the previous weld