Well should I 'attempt' to fill in holes in my car with a mig or get a Tig for it ?? whta kind of gas should I use, cuz right now im using stargon and it seeems to work pretty well on regular steel tubing.

 

if ur using mig welding u want Argon and for tig u want either argon or a 75/25 mix gas. 75/25 is argon and CO2. im not too sure which gas goes with witch its be awhile since ive done any tig welding. gotta get back into it someday.

 

I used to work as a prod welder for a welding company...A TIG would be the best welder to use, since you can precisely control the bead and heat. Not to mention the bead will be very flat, making it simple to grind and blend in with the body. The only draw back to TIG, is that to do thin guage metal takes experiance...since you've never used a TIG in this way, I don't recommend it. You'll burn out the holes, making it worse.
A MIG on the other hand, will be easier for the 'first-timer' when it comes to thin guage metal. The bead will be taller though, and requires more grinding.
Really, it'll be better have an experianced welder do it, since your welding thin guage. It really is difficult, and takes experiance to control thin metal in relation to the weld bead. Thin metal will melt through and away from the point where the welding wire touches.- and it does this quickly. If you must do this yourself, buy some thick steel stock and practice on those for a while. Learn to weld thick to thick, and thin onto the thick...it'll help tremedously, since you'll get the feel how different thicknesses react to differnt size wire and heat ranges. 75/25 is a good all around mix for steel....aluminum and other metals will require other mixes...but these gasses aren't specific to a welder- you can use them on both MIG and TIG.

 

yeah, ive got a lincoln sp125 with 75/25 argon/co2 i've welded steel tube together just never really messed with thin gauge material thats all, what is it.... like 20 or 22 gauge ;p

 

I really don't know...time to get out the micrometers...I would guess between .060 & .125...

 

imagen a normal earring like the post thingy thats 16gauge metal so 22 would be alittle bigger

 

I'm not trying to sound like a know-it-all, but metal guages work just the opposite of what logic says...22 AWG would be thinner than 16 AWG. Just tryin' to help

 

the lower the number (gauge) the thicker the metal, same for wire... i.e. 14 gauge will be thicker than 20

 

Just to add to this.. most auto body metal is 20ga.

Welding thin ga metal takes more time & patience than anything because you have to trigger the welds to keep from eating up the metal. It takes practice & knowing what you're watching to keep a flat weld (which can even be done using an arc welder).