Advantages of Brazing and Soldering Over Fusion Welding

1.Substrate remains solid throughout, therefore less heat energy is required
2.Less of the substrate is affected metallurgically by the application of heat
3.The process is less expensive because it requires less energy

Soldering can be differentiated from brazing because of the lower melting temperature of the filler material. Typically solder constitutes primarily of a tin/lead* alloy with alternative alloy components or percentage changes being introduced and varied to increase/decrease the melting temperature. The cut off between soldering and brazing is generally recognized as being above or below 450C.

A melting point below 450C is typically considered to be soldering and above 450C it is typically considered to be brazing, although silver soldering or hard soldering is normally above 450C and consequently should be considered to be the first level of brazing even though it is never really referred to as brazing and nearly always as soldering.
 

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