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Re: Welding DC+ vs DC- vs AC ... please explain !
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Posted by msb on August 24, 2006 at 19:34:44 from (74.133.28.248):
In Reply to: Re: Welding DC+ vs DC- vs AC ... please explain ! posted by Stan in Oly, WA on August 24, 2006 at 18:11:52:
Easiest way to understanding it is the current flow in an AC welder goes bach and forth from the electrode to the parent metal usually at 60 cycles per second. DC + curent flows in only one direction(which way,I forget).DC- current also flows in only one direction and opposite of the DC+ that I can't remember.One way concentrates(DC_ I believe) the heat on the electrode. The other polarity position(DC +, I believe) concentrates the heat on the parent metal.That position is best if you want deep penetration.---The opposite is good for thin metal where burn through is a problem like sheet metal. The AC welder is a compromise between a DC welder and is much less expensive to manufacture. All have their place though.
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