must be shiny and volcano shape
Yes: flux core solder is. No: acid core solder is not.
use the smallest amount of solder necessary to make a good joint.
yes. it is a good characteristic
Because he is a good solder
No.
A Conductor, SOLDER IS NOT AN INSULATOR. The most common types of solder are made of tin and lead. Another type is silver solder. All of the materials used are metals and are good conductors of both heat and electricity. If you solder something you would notice if you ever held a wire (without protection) while applying solder to it your finger would probably receive a burn (speaking from experience).
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The surface of the solder on the connection you are soldering should be bright and shiny. A cold solder joint will not be shiny, it will have a crinkly look about it. In some cases the joint can be wiggled and it will come apart.
with solder
A good amount of solder is less than one drop, and should be applied through a very hot and clean gun, also making sure that you are using a new solder wire, avoid using solder from already soldered components because it will be having no zinc chloride.
Yes, usually no problem. If you know how to solder, then solder away.
In some solder it is. But even if it is in the solder you should still use flux.