Miller multimatic 235 porosity on aluminum

Hannah Jones · 2025-08-07T08:11:00-04:00

i’m a little bit confused cause my Miller Multimatic 235 leaves porous welds on aluminum with 0.035-inch mig wire at 20 CFH argon, welds look bad. Can you give me a solution to this?

This topic has 2 replies, 3 voices, and was last updated 4 months, 1 week ago by Jessica Singleton.

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- August 7, 2025 at 8:11 am #69533
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  Hannah Jones
  i’m a little bit confused cause my Miller Multimatic 235 leaves porous welds on aluminum with 0.035-inch mig wire at 20 CFH argon, welds look bad. Can you give me a solution to this?
- August 7, 2025 at 2:06 pm #69535
  Moderator
  Aaron Austin
  Check for gas leaks on your Miller Multimatic 235, use 25 CFH argon, fixes porosity.
- August 7, 2025 at 8:42 pm #69536
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  Jessica Singleton
  Clean aluminum with alchohol before welding, dirty metal causes porosity, use fresh mig wire.
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