i tig with 100% argon......i hate tig, anyway......thats just me., when i mig i use a mixer you can ofcourse buy mixed tanks, i prefer a mixer though because when u switch to spray and such you can alter your mix, plus you pay for a mixer once, you pay more for mixed tanks... i usually weld at 75%argon and 25% co2 for minimal spatter and best penetration 100% co2 is alot i dont really know how that would do never tried it, but its the end result that counts. if you pass a visual inspection or a guided bend test with your preferred mix well why not.
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With a spool gun, and a 4.5 inch angle grinder i can, and will weld your hood and car doors shut.
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