Definition
A method of joining metal parts using a nonferrous filler rod that melts at a temperature above 800°F (425°C) but below the melting point of the base metals being joined. Unlike true brazing, the filler in braze welding is deposited in a groove or fillet at the joint rather than drawn into a tight gap by capillary action.
Plain English
A way of joining two pieces of metal by melting a softer metal between them. The two main pieces never melt — only the filler does. The filler bridges the joint and hardens to hold the parts together.
Context Anchor
Seen in aircraft maintenance texts when discussing approved metal repair methods, welding processes, and repair limitations.
Derivation
‘Braze’ comes from the Old English ‘brasian,’ meaning ‘to make of brass’ — because early brazing used brass-based filler. The ‘weld’ part signals that the filler is laid into a joint like a weld bead, rather than being wicked into a close-fitting gap.
Why Pilots Care
Allows strong repairs on thin or heat-sensitive aircraft parts without the warping or weakening caused by full fusion welding.
Grounding Statement
Picture two metal parts heated until a separate filler rod melts onto the seam, while the two original parts stay solid.
Intuition Check
Do not assume “welding” always means the original metal parts are melted together. In braze welding, the filler metal melts; the base metal normally does not.
Example Sentence 1
The mechanic used braze welding to repair a cracked fitting on the steel tube fuselage.
Example Sentence 2
Braze welding restored the damaged engine mount bracket without distorting the surrounding metal.