(μFSW) was also performed using a CNC machine. which does not mean that it is safe and recommended for the milling machine. Friction welding has also been shown to work on wood. Terms and definitions, name shortcuts To quote ISO (the International Organization for Standardization) - ISO 15620:2019(en) Welding — Friction welding of metallic materials: "axial force - force in axial direction between components to be welded, burn-off length - loss of length during the friction phase, burn-off rate - rate of shortening of the components during the friction welding process, component - single item before welding, component induced braking - reduction in rotational speed resulting from friction between the interfaces, external braking - braking located externally reducing the rotational speed, faying surface - surface of one component that is to be in contact with a surface of another component to form a joint, forge force - force applied normal to the faying surfaces at the time when relative movement between the components is ceasing or has ceased, forge burn-off length - amount by which the overall length of the components is reduced during the application of the forge force, forge phase - interval time in the friction welding cycle between the start and finish of application of the forge force, forge pressure - pressure (force per unit area) on the faying surfaces resulting from the axial forge force, forge time - time for which the forge force is applied to the components, friction force - force applied perpendicularly to the faying surfaces during the time that there is relative movement between the components, friction phase - interval time in the friction welding cycle in which the heat necessary for making a weld is generated by relative motion and the friction forces between the components i.e. from contact of components to the start of deceleration, friction pressure - pressure (force per unit area) on the faying surfaces resulting from the axial friction force, friction time - time during which relative movement between the components takes place at rotational speed and under application of the friction forces, interface - contact area developed between the faying surfaces after completion of the welding operation, rotational speed - number of revolutions per minute of rotating component, stick-out - distance a component sticks out from the fixture, or chuck in the direction of the mating component, deceleration phase - interval in the friction welding cycle