Welding questions

[48Rob]

Can I use 309-3091 for welding mild steel?

Will the stainless cause a problem for the welder who will be coming later to do the real welding on the trailer frame ?
(I'm just tacking things together)

I have a large amount of the rod that is doing no good sitting in a drawer...trying to be frugal...

Rob

[Redneck Teepee]

Yes you can, in fact 309 is rated for joining carbon to SS

[48Rob]

Thank you.

I read than on the package, but wanted to be sure it wouldn't cause a problem unforseen to me...

Rob

[Redneck Teepee]

Rob, just about any welding process you choose will go right over your tacks, just be sure and grind them a little first as with any tacks. A 70-S hard wire which is pretty normal in a MIG application won't even know they are there.

[ctstaas]

Hay 49rob, In my experience it's acceptable to weld mild steel with stainless wire. It could require more effort to grind your welds and drilling through a weld might not be practical. Ihe up side is your welds will be rust resistant. I have welded stainless material with mild steel wire and had a slight loss in stainless properties at the weld.

[48Rob]

Thank you.

It is harder to grind, but looks pretty and doesn't rust!

Rob