Copper colored solder can be found at http://www.beadmeus.com/coppercolorsolder.aspx the flux is included in the soldering rod.
It is an alloy of copper.
For copper pipe, lead-free solder is recommended to ensure safe and effective connections.
Sandcloth the end being soldered. Squish the end with pliers so it is tight. Put flux on the end and solder. Easier to buy a copper cap and solder that on!
you solder or braze it
Yes
With fllux, solder and a torch. clean both surfaces with steel wool or sand paper, put a thin film of flux on each piece on the entire area that will be joined. Heat on one side and put the solder on the opposite side. When the copper get hot enough to melt the solder, the flame from the torch will draw the solder to it. That way you know there is solder in the whole joint.
You cannot solder Steel BUT you can braze steel and copper and you can thread steel and then use a copper x female adapter Or finf a steel fitting and use a C x M adapter
The compound symbol for solder can vary depending on the specific composition. Common solder compounds include tin-lead solder (Sn-Pb) and lead-free solder such as tin-silver-copper (Sn-Ag-Cu) or tin-copper (Sn-Cu).
It melts solder. Solder was originally a mix of lead and tin that was used to join copper to copper (pipes and wiring) It is in the shape of a pistol, but does not shoot anything.
What to use to solder a shut off valve
Take either an SOS pad or a wire brush and rough up both the inside of the brass fitting and outside of copper pipe, put the copper pipe into the fitting and solder around it.
on air conditioners you silver braze the copper lines