Assertion: friction | /r/CapableOf | stir rotary friction welding
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Source sentences:
text: The way by which the frictional heat and material mixing occurs is very dependent on the friction welding process utilised, of which there are four primary processes: Friction stir welding (FSW) , friction stir spot welding (FSSW), linear friction welding (LFW) and rotary friction welding (RFW).