Soldering copper tutorial by Oksana Trukhan part 1 

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Part 2 - • Copper Soldering - Pen...
For first, we need a good butane torch. It should be large. It is necessary to get enough heat. Because copper needs more heat than silver. Twice. And we have another problem: the copper loses heat very quickly.
So we have to heat the whole copper piece very much and very quickly.
Imagine that the copper wire is empty. And you have to fill it with fire. It will be your river of fire. When you fill it, the solder melts and joins the parts.
And it is still important that all parts touch each other very closely.
The next question is: what solder to use? I use two kinds of solder: solid solder and paste. The solid solder is very difficult to cut, but it does not contain silver and has a copper color after heating.

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