I brazed something similar and it held fine


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Posted by D Sherman on Thursday, September 18, 2008 at 20:41:45 :

In Reply to: Brazing is more sure-fire for the novice. posted by chriscase on Wednesday, September 17, 2008 at 12:32:08 :

It was the outlet of a Hale fire pump that broke from the water in it freezing. First I tried JB weld, but it blew out the moment I pressurized it. Brazing worked fine. I always add some extra flux, not just the coating on the rod. Ideally, the brass will wick into the crack and make it as strong as new, but that's unlikely since the crack is probably dirty and rusty. So, you V it out to get clean metal. If any crack dead-ends, drill a 1/8" hole just past the end of it for stress relief. Try to heat the whole piece if possible. When done, let it cool slowly. It will work fine. Pump housings have every little stress in them compared to the raw strength of the iron. Brazing is stronger than cast iron. So, there's lots of margin for any imperfections in your brazing. If there's a flange on the casting, it will need to be ground down flat again after you're done, as the heat will have warped it. Most of the time, a large belt sander will do a good enough job at that, so you don't have to take it to a machine shop.



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