Miller has a useful, short article on TIG brazing with silicon bronze up on their website:
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It's worth knowing about.TIG brazing (2025 Update)
Apr 09, 2019
Last reply: 11 months ago
1 Replies
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Yeah, I haven't had to try repairing one but what you mention concerning the heat produced in a working manifold has crossed my mind.
I welded a small cast part for my neighbor with Forney Noma-Cast rod. Looked like crap but held together for a couple years. He sold it recently, so I don't have to worry about re-welding it again :)
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