Cleaning and Flux Application

Cleaning and flux application procedures depend on product designs and personal choice. Heat exchangers are classified in two groups  

For the majority of brazed heat exchangers, assembly is followed by cleaning and subsequently by flux application. However, when internal surfaces need to be fluxed, the production sequence may follow a different order, determined by when and how the flux is applied. 

The purpose of cleaning is to remove fabricating oils and lubricants as well as other contaminants from the surfaces. The cleaning procedure must allow for adequate flux retention and render the surfaces suitable for brazing. Cleaning results have great influence on the brazing result, postbraze product appearance and corrosion performance. 

There is a wide variety of different fluxing methods including  

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