Brazing has been defined as a group of joining processes specially arranged in a manner to produce coalescence of materials. The process involves heating of these materials at a brazing temperature by using a filler metal (solder) which has a liquidus above 840°F (450°C), and below the solidus of the base metals.
In the case of Soldering, the only fact which distinguishes it from brazing is the filler metal used, since, here the liquidus is below 840°F (450°C) while it is above the solidus of the base metals.
Welding involves the process of fusion which takes place along with the melting of base metal and a filler metal.
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