Q: What is the difference between welding and brazing?
A: Brazing and welding are two ways of joining two or more pieces of metal. The design, application, and the material of your product dictate which method you choose. Sometimes a combination is necessary. Welding joins parts together by using intense localized heat to melt the base metal and the filler material creating a line attachment. Imagine the joint created when welding two tubes together. This is an example of a line attachment. It requires skill and extremely high temperature, so precision and proper machinery are essential.
Brazing enables larger surfaces areas to be joined for better thermal conductivity and heat removal. Now, imagine two plates stacked on top of each other. The attachment between them is a plane attachment, as opposed to a linear attachment, and can be created by brazing. Unlike welding, brazing does not require melting the base metal. It is an effective method for line attachment and plane attachment. If the shape of the base part is critical, or if you want to limit the base metal’s exposure to localized heating at the joint, then brazing is a better way to go. It is performed at a uniform temperature compared to welding which uses localized heat which could warp the part. Brazing furnaces can accommodate large volumes of parts at one time and for that reason it is a more economical process than welding for high volumes.