Gas BrazingGas brazing uses a fuel gas with either oxygen or air to heat the component ready for brazing. Brazing materials melt at a temperature greater than 450°C but below the melting point of the component material. The process relies on the filler metal being drawn into the adjacent surfaces of the work by capillary action. Braze welding and bronze welding are often referred to as brazing although there is a clear distinction. Braze welding is the general description of the process where metal is joined with a filler material of lower melting point but capillary action does not take place. When the filler metals are of copper rich alloys this process is known as bronze welding. Most processes whether brazing, bronze welding or braze welding will use a suitable flux, with the main exception of copper phosphorus. Fluxes can be applied directly or through the fuel gas flame. The most widely used range of brazing alloys include aluminium brazing alloys, silver brazing alloys, copper-phosphorus brazing alloys and copper brazing alloys. There are also filler metals available for many other metals. They also cover a wide range of melting points for many different applications.
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