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1st thing would be to see if the gas was reaching the cup, not just the regulator.
2nd would be to check all connections for leaks, letting gas out, or air in.
3rd, check what you're welding, as surface contaminants can be included in the puddle, burn off, and the bubbling from the combustion is seen as porosity.
4th would be to ensure you were given the proper gas (c25 or CO2, and not straight argon) if you've just gotten a refill.
5th would be check for proper polarity. Did you just recently weld w/ some FCAW, and have switched back w/o switching polarity?
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Last edited by Wile E Coyote; 05-17-08 at 10:52 PM.
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