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They are inert gases used to sheild from impurities during the cooling of the weld. It really doesn't even do any cooling (put your hand oven the nozzle and tell me if you think the little that come out would have any cooling effect!). The gas does absolutely noting as far as "cleaning". Running argon over a surface before tig welding is a waste of gas. I find it hard to believe that someone who knows how to tig would even think this !! Different mig gases will have an effect on a mig weld.




Shield gases keep the filler and base mat'l from oxidizing - that all.