TWI Frequently asked questions
Most engineering materials and, therefore, applications can be satisfactorily friction welded without any form of protective atmosphere. Friction welding is intrinsically a well controlled process which, in the case of metals, does not involve melting of the materials being joined.
To enhance weld quality, it can be advantageous to exclude the presence of oxygen in some cases of friction stir welding. Also, applying some form of atmospheric protection in certain friction surfacing applications improves the properties of the deposit. In these cases, an inert gas such as argon or nitrogen is used.
See also:
FAQ:
Can friction welding be carried out in hostile environments?
