Quote Originally Posted by Jim Hardin View Post
Just curious if flux core welding has any place in welding 4130?

It seems to me to be a good fit between Gas and TIG...

Greater deposit rates than both gas or TIG and less heat input than gas.

And initial cash outlay is far less than either.

I have easily welded steels down to 0.03125".

Any thoughts???
Jim, I have welded 4130 with MIG and flux core wire. Nothing on an airplane but various parts of the kids go-kart, jigs, fixtures, etc. Like you, .032" or 1/32 is the thinnest base metal as I have done. With a little practice, I would definitely consider welding a steel tube fuselage. Many years ago a friend welded a fuselage with MIG but I think he used hard wire. He never completed the project so I can't tell you how it turned out.