How rockets are made (ULA)

[eti]

https://youtu.be/o0fG_lnVhHw

It's a blessed relief that there exists a 0.0000000000000001% of ACTUAL, REAL science channels on YouTube, from ACTUAL scientists and engineers who do actual elbow grease for a living, and share the fruits of their labour with the world. 

[Domagoj T]

This is the part you're not supposed to see, as demonstrated by the stir welding machine manufacturer themselves