Posted by Steve@Advance on April 08, 2018 at 16:28:49 from (66.169.147.211):
In Reply to: MIG welder posted by bill from scotland on April 08, 2018 at 16:04:16:
There won't be air in the tank, only co2.
Are you sure gas is actually coming through the gun nozzle? You can turn the wire feed down or open the roller, and should be able to feel gas blowing through the nozzle.
Another possibility, if there was a fan blowing, or wind, the gas will be blown away from the weld. Also trying to weld contaminated metal, water or solvent, burning paint outgassing from under the weld will cause splatter.
An unshielded weld will typically have the appearance of lava, porous and bubbly.
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