Smarter Every Day has a very interesting video[1] inside the factory of United Launch Alliance in which, among a lot of other things, shows the friction stir we

Smarter Every Day has a very interesting video[1] inside the factory of United Launch Alliance in which, among a lot of other things, shows the friction stir welding used in their Atlas Rocket[2]: [1] https://youtu.be/o0fG_lnVhHw https://youtu.be/o0fG_lnVhHw [2] https://youtu.be/o0fG_lnVhHw?t=1933 https://youtu.be/o0fG_lnVhHw?t=1933