Slow motion linear friction welding of titanium - GIF and video

Slow motion linear friction welding of titanium.

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57-second source video:
https://www.youtube.com/watch?v=umEuqbgVOR8

Previously:

https://www.homemadetools.net/forum/...2791#post97149
https://www.homemadetools.net/forum/...7862#post86386
https://www.homemadetools.net/forum/...6268#post83362
https://www.homemadetools.net/forum/...2814#post97209
https://www.homemadetools.net/forum/...3368#post98869
https://www.homemadetools.net/forum/...2847#post97293

Interesting !
I can't figure out what are the kind of red waves we see at both ends, mostly on the left one.
Very visible on the video at 0'28 for instance.
Any idea ?

Interesting, no idea. Here's a good screenshot though:

https://s3-us-west-1.amazonaws.com/h...screenshot.jpg

Viscous, near liquid, titanium being extruded from between the plates?