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Welding & Fabrication Forum
Mig advise
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[QUOTE="ja_cain, post: 1148274, member: 11928"] Hard to give advice with no pictures. Mig usually requires good surface prep relative to stick welding, so you need to make sure that you get all of the crap off of the surface. If it is aluminium coated exhaust then you will probably need to remove the coating where you are welding. Flux core is more forgiving on dirty surfaces and in windy situations but is harder to get nice welds on thinner material. Its also hard to see the puddle sometimes because of all the smoke that is produced. Probably need to turn the voltage up and get sufficient gas flow like the above gentlemen said and it should sound like cooking bacon when you have it right. Mig is the easiest to learn but can still be tricky on the thin stuff. Its all in the sound, surface prep and correct amount/type of shielding gas. [/QUOTE]
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