How Does Brazing Join Metals?

In brazing, molten filler metal enters the gap between components. Wetting and capillary action distribute it through the joint, which forms as the filler cools.

Metallurgical compatibility between the base metal and filler alloy, together with suitable joint clearance, is essential. Melting a brazing rod alone does not ensure a sound joint.

Heating may use a torch, furnace or induction. Depending on the process, flux or a suitable atmosphere protects the joint area.