welding sheet metal

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Okay. I have a mig dvi2. I just need to know how to clean the metal before I weld to it.The car is about 30 years old and the floor pans need to be replaced.Any tips or advice?Please help.Also, any advice on what tools to use to make the welds smooth after?
Reply:Grind off all rust, plating or mill scale that is on the steel.   A flap wheel works nice when doing body work.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:Originally Posted by David RGrind off all rust, plating or mill scale that is on the steel.   A flap wheel works nice when doing body work.David
Reply:If you don't want to stand behind our Troops, feel free to stand in front of them.
Reply:Originally Posted by SWells
Reply:I have no trouble finding them....any place that sells solid grinding wheels usually has them. A little more expensive and don't last as long but they do a great job.If you don't want to stand behind our Troops, feel free to stand in front of them.
Reply:Originally Posted by David RGrind off all rust, plating or mill scale that is on the steel.   A flap wheel works nice when doing body work.David
Reply:is .035" wire alright for sheet metal? I need to get smaller wire don't I?
Reply:I would use .023.David Real world weldin.  When I grow up I want to be a tig weldor.
Reply:Originally Posted by David RI would use .023.David
Reply:I wouldn't recommend it. I would get some .023 wire. The DVI2 works awesome with that wire on sheet metal. Also flap disks should be at any local welding supply. They come in different grits to. I noramlly have four different grit disk on hand. Also I use a angle die grinder a lot with 2 & 3 inch sanding disks, which also come on different grits. Something like these.http://www.harborfreightusa.com/usa/...bCategoryName=http://www.harborfreightusa.com/usa/...layItemList.doAnd how have you been making out. Haven't heard from you in awhileMiller DVI2Lincoln Precision Tig 225Thermodynamics Cutmaster 38Everything else needed.