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Thread: My mig welder was welding funny
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10-28-2011 #1
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My mig welder was welding funny
I have a Lincoln 140c, 110v mig welder. I've always liked Lincolns and decided this was the one I wanted for price and what it can do. I bought it a few years ago and it came with flux core wire. I used that to weld a few things and it worked great. Last winter I patched the floor of my 69 so I bought a gas bottle and some mig wire and switched it over. I remember it not welding quite as good as I would've liked but didn't think too much of it. A couple weeks ago I was welding a gauge panel here at work that I built for the 67 and was getting the worst welds. It was like I had the voltage too low and the wire speed was too slow.
Anyway yesterday I did some searching on the web and found a thread on a forum where a guy was complaining about the same thing. Someone replied to check the polarity because they ship them with flux core wire. I checked mine and it was backwards. I had no idea I needed to switch it when I switched to mig
. So I switched it and it welds great. Now I can go back and fix the lousy weld job on the 69's floor lol. I knew you welded with negative polarity with aluminum but didn't know that about flux core wire.
So moral of the story, if you're having trouble with a mig welder check the polarity.
Traven
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10-28-2011 #2
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+1 on checking the mfg's product data sheet for the brand/size electrode that you are using for the mfg's parameters.
Great Tip. I bet that will be something that you won't forget again....LOL.1970 RS/SS350 139K on the clock:
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Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
10-28-2011 #3
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I sure won't lol. I figured I'd post it to hopefully save someone a headache when they buy a mig and it come set up for flux core and they don't know to change the polarity.
Originally Posted by John Wright
Traven
10-29-2011 #4
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Interesting. Im gonna have to check my Hobart.
1971 Camaro 427 in waiting
1988 C1500 Daily Driver
1955 Bel Air, blown BBC street car
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