Stud welding - GIF

[nova_robotics]

Um, ok. Can we pretend that I don’t know what this is for, and someone might kindly explain? Tnx!

They're pretty versatile. You can get threaded ones. I think there are probably some other styles. In the video above they're installing Nelson Studs as a form of concrete embeds like rebar. Those little mushroom caps will hold the concrete tight against the plate and keep it from separating after pouring.