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Mild steel to cast iron

Posted: Sun Nov 18, 2018 2:37 pm
by ekbmuts
I'm welding a mild steel gate from 16ga. The pickets have a small cast iron finial on them.

What's the best way to weld these little guys? I've done it with flux-core and it seems to work but it's a bit of a bear because the two materials don't seem to want to go together.

So is there a technology for fusing mild steel to cast iron?

Jon

Re: Mild steel to cast iron

Posted: Sun Nov 18, 2018 6:03 pm
by cj737
309 or 312 wire. Nickel rod (if you're stick welding) or Silicon Bronze for MIG/TIG. Any and all work.

Mild steel to cast iron

Posted: Sun Nov 18, 2018 8:43 pm
by Coldman
The best and strongest solution is to use some of this:
https://ezweldtigwire.com/

I've used it a few times now and it's the best thing since sliced bread.

Re: Mild steel to cast iron

Posted: Sun Nov 18, 2018 11:01 pm
by ekbmuts
cj - Great, thanks a lot. I'm MIG welding so I'll get ahold of some of that silicon bronze wire. Dumb question: would this be "braze welding"? Honestly, I always thought that silicon bronze was more for brazing applications. But if you can get it on a spool and feed it through a Lincoln MIG machine, sounds good to me.

I checked into that EZ Weld TIG Wire btw (Coldman). Sounds awesome! If I was TIG welding this fence of mine, I'd use it!

Thanks again.

Jon

Re: Mild steel to cast iron

Posted: Mon Nov 19, 2018 6:33 am
by cj737
Yes, technically it’s brazing. But it’s plenty strong enough for your described application. Use much lower heat than MIG wire.

Re: Mild steel to cast iron

Posted: Mon Nov 19, 2018 7:26 am
by tungstendipper
It looks good but expensive!