ABSTRACT
There is no concise answer to the question ‘What do you mean by furnace brazing’? The term can be applied to any brazing process where a furnace is used as the heatsource to raise the components to be joined to brazing temperature. Therefore in its simplest form it can be the joining of two pieces of brass where the heating is provided by means of an air-containing gas or oil-fired muffle furnace, the joint being produced by a silver-copper-zinc alloy in conjunction with a fluoride-containing flux. Alternatively, and at the upper end of the furnace brazing complexity scale, it can be the brazing of a joint between a ceramic and niobium in a vacuum furnace where the end product is destined to be used in the rocket-motor of an interplanetary vehicle!
