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).
Calorizing of 'V' series exhaust pipes, focusing on issues with welding and brazing.
Identifier | ExFiles\Box 54\4\ Scan011 | |
Date | 6th August 1925 | |
Wd.{Mr Wood/Mr Whitehead} c. Hs.{Lord Ernest Hives - Chair} BY14/H.{Arthur M. Hanbury - Head Complaints} 6.8.25. CALORIZING OF EXHAUST PIPES. "V" SERIES. --------------------------------------- Referring to the Calorizing Corporation's letter of the 23rd ultimo, our replies to the various points raised should be as follows:- 1. We have no facilities for electrically welding flanges to pipes. In addition, one also considers that the type of flange spoken of would be useless for our purpose. One only imagines an electrically welded on flange to be a disc of metal approximately the same gauge as the type welded on to the flat end of the pipe, having the ultimate appearance of a flanged pipe. 2. In regard to an attempt to weld our type of flanges to pipes, this can be done, but again we should want some kind of protection on the joints of the pipes, as from our experience a calorized surface is rough and not suitable for making joints, whilst in addition, the welding of the pipe is not altogether satisfactory. We should have to weld and rivet. The welding would be done at the front end of the flange so that the strength of the pipe was unaffected. 3. In their second paragraph they mention that the metal would rapidly scale away at the point of brazing. Do they mean by this that an electrolitic action would be set up between the brazing on the steel pipe at one point and the calorized surface inside the pipe or where the calorizing outside finishes close to the brazing. If they mean that we should not be able to protect the pipe by calorizing where the joint was, we would agree, but this does not constitute a difficulty in as much as the pipe itself only fails due to the fact that we lag it over certain parts of its length with asbestos cord, and it is under the asbestos cord where the pipe flakes away, not where the pipe is exposed. We lag the pipe not to protect it but to attempt to damp out the effect of the impact of the gases on certain parts of the silencer system, which is audible if the pipe is not lagged. Contd. | ||