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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Challenges of calorizing brazed exhaust pipes and exploring alternatives.

Identifier  ExFiles\Box 54\4\  Scan008
Date  17th July 1925
  
+4635

HS.{Lord Ernest Hives - Chair}

BYG/H.{Arthur M. Hanbury - Head Complaints} 17.7.25.

CALORIZING OF EXHAUST PIPES.

I find, as anticipated, that it is impossible to treat brazed up joints by the Calorizing process. The temperature of Calorizing is 800 to 900°C. The brazing joint, of course, will melt at about 750 to 800°C.

I have got the Calorizing man coming over here on Monday to discuss whether it is possible to arrange for protection of the parts of the tube which would ultimately have to be brazed together. He could not give us this information on the telephone, but is looking into it and will be prepared to discuss the matter fully on Monday next.

In the meantime, as another way out, I am making enquiries for tube made from stainless iron or "Stabrite" steel, and have handed to RHC.{R. H. Coverley - Production Engineer} a piece of "Stabrite" steel which I want him to try and dip braze. We are aware there is a difficulty in brazing "Stabrite", but possibly it can be dip-brazed where there would be very much greater difficulty to braze it under ordinary conditions. This is a matter which RHC.{R. H. Coverley - Production Engineer} is trying to settle.

I have instructed the Works not to run dynamometer tests with the down-take pipes and first silencer which belong to the car, attached. A Works' outfit will have to be used for these fittings, in order to prevent unnecessary corrosion in the early stages of running.

BY.{R.W. Bailey - Chief Engineer} [Signature]
  
  


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