| You can’t weld cast iron . Why does this stuff keep coming up ? The cooling leaves stress risers . You can braze it maybe . Perhaps these rods are braze . Welding means you actually melt the base metal ( cast iron) — You “weld “ cast iron it cools too fast from melting temp of iron( white hot ) —- unless all of it is very near that cast iron melt temp . When it cools with normal setup even with best preheat your can practically do the metal is left with tremendous stress right next to weld it cracks there like glass . Cast iron is inherently very brittle like glass due to its structure . For same reason hot glass cracks if you put water on it . You can see it , cracks on clear glass — but not in cast iron . One bump or thermal stress you have a lot of little pieces . The duty exhaust manifold sees is very tough , heating very hot , and cooling with one face clamped to block which does not get hotter than 220 . So a lot of force as they expand and cool to different temps , yet clamped by bolts Why they crack in first place ; putting a pre cracked one half glued or pre cracked back in is a loser . Various rods come and go claiming miracles . But some are actually brazing (maybe )— melting an alloy mix onto hot cast iron as a sort of metal glue . Brazing is very strong if it “ takes” to iron , just like solder . But Try soldering aluminum . Like brazing cast iron . As far as really doing it right see Stitch and Weld ( I think that is the name -/in California?) They heat it almost to melting , white hot and then weld with a cast iron rod in a special furnace they build for the part shape while white hot . Then a special slow controlled cooling ; it is like a new all cast iron casting then , all homogenous . About 1000$ to fix a manifold . That works they are very successful . If you could do it with a special rod for 30$ , why would people pay 1000 ? Anyway , forewarned is all one can do .. jkg
-- Sent from my iPhone On Sep 19, 2022, at 7:19 PM, Ron Waters <ronbo97@xxxxxxxxxxx> wrote:
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