Can anyone remember the “official” difference between : Hard & Soft solders ?
While browsing for something else entirely, I found my copy of ‘Model Locomotive and Marine Boilers’ [Argus Press, 1988, ISBN 0-85242-923-1] by Martin Evans (well known in the Model Engineering field, at least in the UK) from which I have gratuitously (and without prejudice) stolen the following extract for your contemplation. As an aside, this is a useful book for those interested in designing and building boilers. Chapter 3, page 55: Silver Soldering and Brazing Soldering and brazing are processes which involve the joining of metals by the addition of molten filler metal of substantially different composition, at temperatures well below their melting point. An important difference between silver-soldering and brazing or welding is that the brazing alloy or filler material must be drawn by capillary forces right through the mating joint surfaces, and not merely deposited at the edges. Soft Solders are generally accepted as including the alloys of low melting point up to about 400 deg.
