By G. Sheward
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Extra info for High-Temperature Brazing in Controlled Atmospheres
There should also be some method of measuring pressure/ vacuum, depending upon the type of atmosphere being used. It should be obvious that the vessel is not totally sealed in those cases when cover gas is fed in, as pressure build-up could cause an explo sion. Metallic vessels of this type are not particularly good for vacuum applications at high temperatures, as inward gas diffusion through the material will occur and affect the quality of the atmosphere. If the seal at the end of the vessel is welded, this should be positioned outside the heated zone, as thermal cycling of the weld will result in rapid failure.
0 Carbon content (%) FIG. 3 THE RELATIONSHIP BETWEEN C 0 2 COVER GAS (AFTER F. G. 3 Nitrogen This gas has recently been proposed as an alternative to the endo and exo atmospheres generated for copper brazing of carbon steels.
Mi Hsssssssssssssssss o o o o o o o Heating elements N Door- o oN -Insulation KSSSSSSSSSSSSSSSSN FIG. 5 MUFFLE FURNACE ^Charge Types of Furnace 45 system surrounding the charge and so within the same vessel there can be considerable variations in temperature, which does not help in producing a uniform brazed component, even from the same charge. This type of vessel is very little used for high-quality work and has largely been superseded by the vacuum furnace. THE COLD-WALLED VACUUM FURNACE This is the work horse for the production of high-quality components, for use not only in the aerospace and nuclear industries, but also in dairy and brewery equipment.