I usually weld thicker metal and have never welded on a car at all im trying to replace my radiator support because of front end damage and im wondering if i can get away with a flux core welder to fill up the holes im really not trying to buy a bottle of gas only to use it one time.

 

yes you can use a flux core welder to weld your core support..
although it will make it harder, if you ever have to replace a core support on the same car again.

 

^ I dont understand what your getting at, flux vs gas your still doing the exact same thing....welding a 8mm plug weld.
It depends on your welder I suppose. If your just trying to go to town with a cheap-o welder with no dial to adjust amperage, then it could suck. Personally I wouldn't flux it, but I suppose you "could"...although I have never mig welded with flux wire through a good welder.

 

Alright thanks yea i just don't want to buy a bottle of gas that im only gonna use once and i don't have a garage to store it.

 

As I understand it, Flux-Core is for use without Argon/co2 shielding gas.
I don't believe it is inteded/reccomended for use with shielding gas.
Note: I am NOT a professional welder, correct me if I'm wrong.

 

Yes you can use it without gas that's why its so cheap to buy one at harbor freight i weld 1" plate with fluxcore but we use about 25 psi of co2 to get more penetration that's why i asked i didn't want to bust out my buddys fluxcore with no gas and burn up my new rad support but i guess you can weld thin stuff with it too.

 

You can use flux with gas, but it's not common.

The OP can accomplish this task with flux as well but it won't look as good, though it doesnt sound as he's concerned with that.

 

Who ever said it was?

 

it's main purpose is to not use shielding gas, but it certainly can be used with it.

 

Ok good to know thanks to anyone who answered i don't really care about the looks as long as it will hold and not fall 2 feet down the road (If you don't think that it will hold please let me know why ive never welded on a car period and don't want to mess this up)

 

yes it will hold up using a mig welder, using flux core.
no gas needed..
I have done two core supports and a sun roof/moon roof. mig welding without gas. NO problems at all..
I stated that i would just be difficult to remove the new core support if it were to be replaced again at a later date. but as long as your welds are structuraly sounds, you should have no issues with it falling off.