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Tool Talk Discussion Forum

Re: Explain this crack

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Author  [Modern View]

03-02-2013 07:10:40

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I kinda tend to agree with you that it's too hot for brazing. Generally I wouldn't... but in this case you can see the discoloration in the bend that says the bend was a lot hotter than the rest of the pipe... which is quite natural. I would say it probably takes on a dull red that would be visible at night... which is mabey not hot enough to make brass run but it's certainly hot enough to make it soft and weak.


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Stick welding

03-02-2013 09:56:46

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 Re: Explain this crack in reply to RodInNS, 03-02-2013 07:10:40  
If I remember right, brazing is good up to about 800 deg's. Directly out of the exhaust port and a bend too boot, would get that pipe pretty darn hot when that engine is working. I think exhaust temps can reach 1200 and even 1600 deg's. Some exhaust throws flames and does gets glowing red when you see it at night. The discoloration could be from rain on the hot exhaust pipe. The pipe could just be worn out too. I've seen a cast iron manifold worn out from getting so hot. It was on an IH tandem with a 549 V-8 gas engine.

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03-02-2013 10:26:54

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 Re: Explain this crack in reply to Stick welding, 03-02-2013 09:56:46  
EGT on that little thing shouldn't run much above 900 in the pipe. 900-1000 is fairly common. More discoloration in the bend is fairly common because the blast is directed at it and focused on that spot. It was always a common thing to see Ford's that were turned up... blow the top bend out of their mufflers.
I've brazed diesel exhaust pipes before. Generally, if the high temp paint on the pipe hasn't been burned off the brass will be fine... but in this case... I'd say the pipe is already thin from the inside. It probably wasn't much more than 16 ga anyhow. It's just thankless trying to fix that. One thing to play with it; quite another to charge someone money for it.


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