Unintended Detachment and Project Failure

What happens here

Immediately following the application of heat and the attempt to introduce solder, the brass fitting abruptly detaches and falls from the copper pipe with an audible clunk. This unexpected event signals a complete failure to establish a secure or permanent joint. The detachment is likely a consequence of using an incorrect fitting type for soldering (a PEX crimp fitting in a soldering context), improper heating techniques leading to material degradation, or the failure of any pre-existing, inadequate connection. The video concludes with an on-screen text expressing frustration over the failed DIY attempt.

Goal: Understand the failure of the plumbing connection attempt