Definition
An electric resistance welding process in which two metal parts are joined by a very brief, high-current arc discharge followed immediately by a percussive (impact) blow that forces the parts together while the contact surfaces are molten. The arc and impact happen so quickly that heat does not spread far into the surrounding metal, allowing dissimilar metals and small precision parts to be welded with minimal distortion.
Plain English
A welding method that uses a quick electrical spark to melt the joining surfaces of two parts and then slams them together at the same instant, fusing them with very little heat damage to the rest of the part.
Context Anchor
Seen in aircraft maintenance and repair discussions about specialized metal-joining methods, especially for small parts or electrical connections.
Derivation
Percussive comes from the Latin percutere, meaning 'to strike.' The name reflects the sudden striking action that completes the weld at the moment of arc discharge.
Why Pilots Care
A pilot is unlikely to perform percussive welding, but knowing the term helps when reading maintenance records, repair descriptions, or component manufacturing information.
Grounding Statement
Picture two metal ends being flashed hot for a moment and then driven together quickly to form one solid connection.
Intuition Check
Percussive does not mean the metal is simply hammered into place. Here it means heat and a quick force are used together to create the weld.
Example Sentence 1
The small electrical terminals on the relay assembly were joined using percussive welding to avoid heating the surrounding components.
Example Sentence 2
Aircraft electrical harness repairs sometimes rely on percussive welding for strong, low-resistance connections.