Hard soldering, silver soldering, and brazing all refer to soldering where the filler melts at over 420C…. Not sure what soddering is… :-) ...

As she explains in the video below, silver soldering, or “hard” soldering, uses solder that melts at a much higher temperature than “soft” solders like we’re used to in electronics.

It describes the conditions under which soft and hard soldering can be carried out most successfully, the best fluxes to use, and the proper way to apply them and the solder.