They’re using a linear friction welding machine which oscillates the sample at about 200hz. Their best guess is linen lignin cells within the wood are melting, interlocking and rejoining ...

Linear friction welding is one of the few welding processes that can quickly and easily join materials together, sometimes in under a second. Business Insider Subscribe Newsletters ...

Friction welding (also known as stir welding), is the process of taking two pieces of material (typically metal, or plastic), and vibrating one of them super fast while pushing against a ...