In the 1960s and 1970s, there were no high-strength bolts, and the welding technology was not as advanced as it is now. Therefore, many steel structures were connected by rivets, which can sometimes be seen when watching old movies. It is almost an antique.
Aluminum or steel pull rivets are used for locking sheet steel when used as enclosure structure, and cannot be used in structure. As for whether sheet steel enclosure is a steel structure or not, at least structural professionals at that time paid little attention to pull rivets.
Post time: Oct-20-2021