[Patrick Johnson]

To all community members, I am a little bit confused cause my Lincoln 140 mig welder leaves porous welds on aluminum with 0.035-inch mig wire at 20 CFH argon, welds look bad. any fixes?

[Alan Underwood]

Check for gas leaks on your Lincoln 140 mig welder, use 25 CFH argon, fixes porosity.

[Dylan Williams]

Clean aluminum with alchohol before welding, dirty metal causes porosity, use fresh mig wire.

[Barbara Baldwin]

Use gas lens on your Lincoln 140 mig welder, improves argon coverage, set flow to 22 CFH.

[Author]

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