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).
Material composition and heat treatment possibilities related to hydrogen brazing.
| Identifier | ExFiles\Box 152\2\ scan0147 | |
| Date | 29th June 1939 | |
| 1293. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} BY.18/G.29.6.39. HYDROGEN BRAZING. With reference to Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}6/MH.{M. Huckerby}21.6.39. I have been strongly interested in Hydrogen brazing for quite a time, but during the last two years I have felt the need beyond all question of replacing normal brazing operations by hydrogen brazing. In your experiment I do not know what the material of the pressed steel arms actually was, it could, of course, have been either a nickel alloy or a plain carbon steel with a content of approximately .28 carbon. I imagine that the material was really a deep pressing with about .1 carbon, which is not amenable to heat treatment. Hydrogen brazing does give one the possibility of heat treating the finished piece, and therefore if the levers were made in either a cheap alloy steel or a carbon steel, the finished piece could be heat treated, and where rigidity was not the controlling factor the life of the part could be very materially increased. I have tried heat treating pieces in the form of levers with bosses, hydrogen brazed to tubes. It is probably desirable, however, to heat treat a piece similar to the one described in your memo, as in this case there may be some tendency to shear across the section of the cover in a sudden quench. Personally, I do not think there is any real danger of this, but two pieces should be tried, one heat treated and one not, and subjected to some simple form of fatigue test operated by a crank against a spring load. By.{R.W. Bailey - Chief Engineer} | ||