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Old 03-10-2012, 12:19 PM
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Mig issues

I have an old Century Mig welder running .30 wire and 75/25 gas. Noticed today that vertical welds were not getting full penetration with the gas on. I found out after lunch when I ran a bead without turning the gas back on and saw the ugly, but better penetration of the bead.

Ideas?

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Old 03-11-2012, 04:46 AM
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Are you going vertical down or up, I have never heard of getting better penetration with no gas. If you went pure co2 as a shielding gas you can get better penetration also.
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Old 03-11-2012, 05:58 AM
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I also forgot wire stick-out try to keep it just about 3/8 of inch from the tip to the where the wire touches the metal. Too far and the amperage goes down because of the constant voltage characteristics of a mig.
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Old 03-11-2012, 08:47 AM
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Yeah it was vertical. It's really strange. I was able to get it all done, but with a series of tacks instead of a bead.
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Old 03-11-2012, 09:12 AM
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is ur polarity right for hardwire work shud b on neg gun on positive, u need to switch em other way for gasless fluxcore. If polarity is wrong welds will be horrible visibly an functionally. Or try turning up wire speed heat does play a part in penatration but wire speed plays alot in pentration too but still have to b ballanced.
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Old 03-12-2012, 03:15 PM
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Quote:
Originally Posted by mustangsal
I have an old Century Mig welder running .30 wire and 75/25 gas. Noticed today that vertical welds were not getting full penetration with the gas on. I found out after lunch when I ran a bead without turning the gas back on and saw the ugly, but better penetration of the bead.

Ideas?
A few question of my own so we can get a better understanding about what you are working with and trying to do.

1. What kind of welder are you using? 110v or 220v
2. What thickness of material are you trying to weld?
3. Can you post some pictures?
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Old 03-12-2012, 05:50 PM
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Weather getting better, did you open a door? Do you have a breeze which can blow away the shielded gas? Sometimes you have to increase your flow if it is going up as the shielded gas is heavy and falls away.
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