The mechanism of mechanically induced vibrational wood fusion welding is shown to be due mostly to the melting and flowing of amorphous cells-interconnecting polymer material in the structure of wood, mainly lignin, but also some hemicelluloses.
A Study of Joining Processes for Pipelines (L51534) - reviews development of the Fusion Welding, Forge Welding and Mechanical Interference Joining welding processes and compares the economics of the various alternatives.
However during conventional fusion welding there is always a danger that distortion can occur or that the poor weldability of the material can result in a significant loss in mechanical performance or weld integrity.
Friction stir welding (FSW) is a solid state welding process developed by The Welding Institute (UK) in 1991, and now being used increasingly for joining aluminium alloys for which fusion welding is often difficult.
Twelve years in development, the new 'Body in White' is the first production car body to be built using aerospace cold joining techniques for the whole assembly, eliminating fusion welding from the body shop.