[Beauregard]

I have tried migging copper to steel using silicone bronze and straight argon gas as suggested by other welders but all I get is a glob or a ball when I tack weld. I experimented using steel wire and it appears to be a better weld, the steel and copper mix together and form a smoother tack that appears strong. My question is over time will there be some sort of reaction in the weld because of the mixing of dissimilar metals.

[jtybt]

That's an interesting question. I'm a noob but have been working on boats for a while and in the marine industry, brass and bronze plugs(copper alloys) are regularly use on cast iron blocks and exhaust manifolds with not ill effects. On that basis I would think it safe.

I just didn't know it was possible to weld copper to steel.