stainless overflow tank

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stainless overflow tank going on my 1968 cougar. It's thin gauge material so the welds didn't turn out as nice as I wanted them too. The edges are a little grey in color but just a little clear coat and some brackets which I will build later and it will be good to go. Attached Images
Reply:great jobLincoln Power Arc 4000 Thermal Arc Fabricator 252 iThermal arc 186Thermal Arc 26 tigTweeko 200 amp spool gunHobart AirForce 400WP-17V-12R
Reply:any criticism or remarks on why stainless would turn nasty grey colors would be appreciated. It seems like I chose too thin of material which got too hot. but it's what I had and didn't feel like buying anything else. thanks,josh
Reply:good job too much heat -too slow - lack of gas coverage just get some rouge and buff it all out...  never know it was grayidealarc 250/250 ac-dc tigidealarc 250/250 ac-dc tig #2 used for sticklincoln sp100hh125dual arbor grinder polisher30 yrs of hand tools52 pitch blocks 6p-26prake gauge -pitch gaugeG&D prop repair 918-207-6938Hulbert,okla 74441
Reply:Pickling Paste works really well to take that discoloration off. It takes about 20mins of sitting with the paste on it, and about 2min of scrubbing with a scotchbrite and rinse. We do it all the time with pipe welds.