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Flashcards in Manual Metal Arc Welding Deck (3)
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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.


what are the functions of slag

minimizing impurities in the weld

form coating which protects weld from oxidization

prevent cracking and brittleness


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