Definition
A method of joining two pieces of metal by heating them in a forge until they reach a plastic, near-molten state, then hammering or pressing them together until the surfaces fuse into a single piece. No filler material is used; the bond is created by pressure applied to the heated metal.
Plain English
Two pieces of hot metal are pounded together until they become one piece. The heat softens them and the hammering makes them stick.
Context Anchor
Seen in aircraft maintenance and metal repair discussions, especially when describing older or specialized ways of joining steel parts.
Derivation
Forge comes from the Latin fabrica, meaning a workshop or place where things are made. A forge is the hearth where metal is heated. Forge welding literally means welding done at the forge, using heat and hammer rather than electricity or gas.
Why Pilots Care
Forge welding is rarely used in modern aircraft repair, but maintenance personnel working on antique or restored aircraft may encounter forge-welded joints in original structures and need to recognise them when inspecting or repairing airframes.
Intuition Check
Forge welding is not the same as making a fake copy of something. Here, forge means heating and shaping metal; the weld is made by heat plus pressure, not by an electric arc alone.
Example Sentence 1
The early steel tube fuselage fittings on that vintage biplane were joined by forge welding rather than gas welding.
Example Sentence 2
Mechanics prefer forge welding for certain engine mounts because the joint retains the parent metal properties.