View Full Version : MIG Welding 4130 .040" Sheet

08-22-2005, 02:05 PM
Would like to find .023" 4130 wire for my MIG welder. Need to fill some holes in .040" 4130 sheet that will be redrilled a different size then heat treated. The weld needs to have the same machining and heat treat properties as 4130.....anyone know who carries .023" 4130 MIG wire?

Thank you,

08-22-2005, 02:10 PM
Check with someone that sells to the aircraft repair trade. 4130 is widely used in aircraft parts and tube fuselage repair.

3 Phase Lightbulb
08-22-2005, 02:27 PM

There is a good discussion on MIG welding chrommolly over on Miller's site:


I tried MIG welding Chrommolly the other day but I found it wasn't really giving me great results. TIG welding it certainly takes more time but it really does TIG weld nicely without needing to preheat.

I think trying to fill in a hole with MIG on chrommolly sheet might be hard and would also require a lot of post weld work. If TIG is an option for you, it's definitely the way to go even though it's takes a lot longer and is more expensive, etc.


08-23-2005, 07:58 AM
I've made a lot of money repairing 4130 weldments that were "reparied" with a mig welder using er70s filler like recomended. I highly reccomend stickinf with TIG or O/A for repairs to 4130 in a draft free enviroment, with the proper post weld stress relief. Shawn