It is recommended that a welder should use 023 or 024 inch wire for light gauge sheet metal work.
Tig welding 18 gauge sheet metal.
With the pedal i m able to fluctuate the amperage to get exactly the size weld and penetration i need.
Say if you are welding an 18 gauge stainless steel sheet that is 2 2 feet in size to repair the side of your tank start by creating a weld that is 1inch long then skip 6 inches and then create a 1 inch long weld.
As a rule when mig welding sheet metal never use a body filler metal that is thicker than the base metal.
Because it will have you a lot more control over the whole process and it is more forgiving in.
Keep the stick out short stickout of your mig wire is important when welding any type of metal but especially sheet metal.
Tig welding takes allot of practice to master so don t get discouraged.
Continue the same way along the sides of the piece of sheet metal.
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If you are working on auto body sheet metal you may want to buy a 120 volt mig welder.
Ditch a 1 8 inch tungsten electrode for something much smaller like 1 16 inch tungsten.
I use a 1 16 red electrode and either 030 or 035 tig filler rod.
How to weld auto body sheet metal with a tig welder.
For thinner gauge sheet metal like 18 or 20 gauge we suggest 023 6mm wire in your mig welder.
The best two electrodes for welding auto body sheet metal is either ceriated tungsten or thoriated tungsten.
Practice on some scrap steel till you get the feel for the melting point of the steel.
However if you are dealing with materials that are 18 gauge or thicker one should be able to use 030 inch welding wire.