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by clifford
(canada)

what kind of voltage and wire speed would you use for 1/2 lap joint

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that is a wide open question because we could be talking about flux core, short circuit mig, or even spray transfer mig.

i always like to refer people to millers weld calculator.

http://www.millerwelds.com/resources/calculators/mig_solid_amperage_calculator.php

just copy and paste in your browser address bar.