Brazing is a metal to metal joining process in which products are joined together by melting and flowing a filler metal into the joint, the filler metal having a lower melting point than the adjoining metal. The resulting joint is typically strong and permanent. Brazing differs from welding in that it does not involve melting of the products being joined, and differs from soldering in that it uses higher temperatures, whilst also requiring tighter tolerances on the products being joined.
Brazing is considered a permanent joint. The use of a naked flame to connect the fitting to the pipework however means that a hot works permit will be necessary.
Generally brazing fittings are manufactured from duplex brass, dezincification resistant brass alloy (DZR) or gunmetal.