A soldering machine

I have a problem to submit to the Orchid Community. My partner bought
an old soldering machine and with it, no user’s booklet. With little
knowledge of that kind of machinery, I tried to solder. I succeeded in
doing just one spot soldering with two thin piece of copper. And I
have to work on a huge copper silver plated plate. Where is the
problem? Is it a question of intensity of electricity, the thickness
of the metal I used, the flux or the kind of solder I planned to use.
So that why I am coming to you to solve my dilemma. Thanks in advance.

Jean-Eudes Germain
@Jean-Eudes_Germain