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Linear friction welding
Linear friction welding is a form of friction welding in which components to be welded are moved against each other linearly, as opposed to in a rotary fashion. Linear friction welding is commonly used in the aeroengine industry to join blades and discs.
The world-wide industrial acceptance of the economic benefits and high weld quality produced when using conventional rotary friction welding to produce joints in round section metallic components led to the development of linear friction welding (LFW). Non-round or complex geometry components, such as aircraft engine blades to discs, can be welded using LFW, which is a solid phase, machine tool based process.
LFW involves rubbing one component across the face of a second rigidly clamped component, using a linear reciprocating motion. This motion is currently produced using a small amplitude of ±1-3mm, at a frequency of 25-125Hz and a maximum axial welding force of 150kN.