Brazing VS Glue?

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Connections to your copper lines need to be brazed - as shown on this picture. Brazing is done with a silver bar at a very high temperature. 

Is brazing better than soldering?

Soldering, in addition to having a lower processing temperature, typically results in a lower-strength joint than a brazed joint.  The shear strength of brazed joints typically exceeds that of soldered joints by a factor of five.

Now take a look at the video below to understand the risks in having substandard work done.