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Got tired of trying to use my arc welder on thin stuff so decided to get a mig. Everyone says how easy it is to lay a pretty bead with one. I have spent the last 3 months trying every technique know to man to make pretty work with my Hobart 135, and my work looks like I'm welding between budweisers. The biggest mess you've ever seen. I've called friends, begged for help from pro welders, went to the vendor that sold it to me and got dozens of tips, but nothing helped. Finally, I talk to a guy at a welding supply place and the first thing he says is "did you reverse the polarity since you're using solid core wire with gas". HUH???? NOBODY mentioned that! Nor did the manual (in plain english)!!!!. I tryed it and layed down a row of dimes that would make a pro proud. DAMN!!!!!! WHY IS THIS SUCH A SECRET????? For anybody who's starting out with a mig, please note....a Hobart comes from the factory with polarity set for flux core wire. Reverse polarity when using solid core wire and gas.

66 Pony Coupe, auto, 289
 

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I bought a HTP 140 mig welder. To switch polarity, I just have to switch the leads on the front, they just plug in. Any time you weld with D.C. you need to be able to switch polarity because it does make a BIG difference. Arc welding rods will have specs. as to wether they're A.C. or D.C. and if D.C. , what type of polarity.

Tom
You can do anything you want to......ONCE!
aka "my 66 coupe"
 
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My Hobart 135 has a label on the inside of the lift up panel that tells all about the polarity.

http://members.tripod.com/tangdar/
'67 Coupe project car (Did I say project car? I meant pile of rust)
http://www.americainter.net/~fevans/tangdar_flintstone.jpg
 
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