RE: {Chrysler 300} More on Welding Cast Iron

["Ron Waters" <ronbo97@xxxxxxxxxxx>]

Well, if you watch the video, it is actually more like brazing. Their explanation in the video has me intrigued. If I knew how to stick weld, then I'd be tempted to try it.

 

I was at a show this weekend and the owner of a 59 Plymouth showed me how his exhaust manifold was brazed/welded/whatever with at nickel rod. He said that he had it done about a month ago. I said he should contact me next spring, when he discovers that it cracked again, so I can sell him an unbroken one.

 

Ron

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From: John Grady [mailto:jkg@xxxxxxxxxxxxxxxxx]
Sent: Monday, September 19, 2022 9:36 PM
To: Ron Waters
Cc: chrysler 300 club
Subject: Re: {Chrysler 300} More on Welding Cast Iron

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:



All -

 

There's a company, Muggy Weld, that shows how to stick weld a cast iron manifold using two of their special rods.

https://www.muggyweld.com/video/weld-exhaust-manifold/

 

Has anyone tried this ?

 

Ron

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