DC machine vs AC machine???

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This welding stuff is like a foreign language but I'm trying.  I "think" I understand that the Hobart engine driven 4500 stick welder is an AC machine and that it seems many others are DC.  I don't get the difference?  Can someone please explain.
Reply:Do you know what AC and DC current is?As far as welding DC is for most applications the way to go.Me!
Reply:most engine driven welders are dc
Reply:DC is a bit safer in wet conditions.  DC probably has a wider array of rods (filler) available.  DC is a good bit "smoother" to weld with, i.e., arc starting is easier with less sticking of the electrode.  DC has two polarity settings which helps with welding both thick and thin material.  On the other hand, AC works fine in many applications.  There is no arc blow or wander that may occur in DC welding.  AC-only machines are often VERY simple, which often translates into much less expensive.  The cheapest Lincoln tombstone is AC only and it is probably one of the most recognizable machines out there because there are sooooo many in use.  If you ever wonder what one will do, here is a recent project with an AC225 to look over.http://weldingweb.com/vbb/showthread.php?t=20776Smithboy...if it ain't broke, you ain't tryin'.
Reply:Originally Posted by gbrettmost engine driven welders are dc