The shop I work in uses .045 Corex metal core for all of our heavier gauge work. I have been told that they previously used flux core (T9?). As far as I can tell the main reason they switched over was because the metal core is cheaper. I, as well as my coworkers all find it very finicky as it doesn't feed well, kink easily and has a very dirty surface that plugs liners. What I am most curious about is its mettalurgical properties/ quality. If anybody has knowledge or experience any input would be great, thanks.

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