bubbles when im tig welding

why is it when im tig welding i get bubbles when im starting or in the middle of a run?

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contamination of some kind...could be lack of gas coverage, could be mill scale from hot rolled steel, paint, oil.

if you are welding plain carbon steel and what you are welding is not coded or critical , using 309 ss rod will help.
but ideally you need to determine the problem.

could be sucking air in your torch from line or torch body .

also make sure you are using tig rod and not gas welding rod or coat hanger...tig rod has deoxidizers that you need. otherwise you get bubbles.

thanks for the post,

jody