Brazing Cast Iron-Your process?

Why not weld? Use cast iron rod and an oxyacetylene torch. I'm no expert, but I've watched someone who was fix an exhaust manifold that way.

-- Mike

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Agreed. Controlling a brazing job like that leads to madness. Regards. Ken.

If you do a search for "maintenance welding alloys", you will come up with a flux coated rod suitable for welding dirty cast iron. Magna Alloys sells one in Australia called Magna 77 which is really good and matches your requirements.

There is one link you could investigate

If you decide to try a stick welder, use a rod very high in nickel content I've found that to work well.

Seems like an interesting process. How much? How does it work? How fast will it build up?

Marty

"David Courtney" wrote in news:beusp4$97svr$ snipped-for-privacy@ID-70857.news.uni-berlin.de:

I've repaired cast iron parts using ordinary coated brazing rods available from my local welding supplier. Clean, preheat, braze and then let cool slowly in a can of ashes.

I was looking at an article in Machinist's Workshop the other day where the author suggested Manganese/Bronze rod when repairing cast iron gears as a higher strength alternative.

Heat control is important. I've had reasonable luck building a temporary forge to allow preheating to 5-600 degrees, then using a torch to bring the repair area up to brazing temp. You can use a much smaller flame that way and have better control of the brazing zone.