Manufacturing Processes--Brazing and Soldering I

Brazing and soldering comes under the manufacturing processes category of joining. The process in both cases involves introducing a low temperature alloy into a controlled gap between metal surfaces. An important aspect of the brazing and soldering process is the preparation of the component material in the area of the joint before starting to braze or solder the joint.

The operator needs to ensure the surfaces to be joined are scrupulously cleaned, degreased and if necessary abraded. Without proper preparation the flow of liquid metal into the joint will not occur satisfactorily. Brazing and soldering relies on a capillary action taking place for the molten metal to flow between the components being joined. The parent metal remains above melting point for the duration of the process and a flux is used, specifically chosen for the metal being joined, to aid the capillary flow of the liquid metal.

High production volumes of components being joined using the brazing or soldering process are normally pre-assembled (or where necessary jigged), often with a pre-sized charge of alloy which has been calculated to be sufficient to fill the joint adequately. Heat can be applied in a number of ways but one of the most common methods is using a conveyer furnace with a torch or induction heating as the heat source.
 

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