Seeing Friction Welding in Slow Motion Is Like Watching Stars Form

Friction welding already looks out of this world. I mean, watching two pieces of metal forge together through friction as they turn bright space orange? Awesome. But seeing friction welding in slow motion? That’s when we find out how truly spectacular the process is. The little sparks flying off the metal blocks look like stars being formed.

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Interesting. Not being a metal worker, I don’t know anything about this. How long does it really take, and what are the uses?