how do you sweat solder copper pipes?
On large commercial jets it is required. Came out of an AD from the FAA after a brake fire the tire blew the air helped feed the fire. Now they use nitrogen since it is an irert gas and won't help feed the fire.
Stephen has it right, but another tip is to focus the heat of the torch on the fitting you want the solder to flow into (not the length of pipe going into the fitting).
This is a simple process 1st clean the ends to be soldered with steel wool or an equivalent 2nd add flux to the ends to be soldered 3rd this step is called tinning you heat the ends up and apply solder to them all the way around you aren't looking for a build up here this is where tinning got its name what used to have a copper look now is silver. The final step heat the two pieces and join them as the solder melts you will be able to push the 2 pieces together.
Clean the pipe with emery cloth all the way around add flux to the pipe put the pipe together heat with a torch touch the solder to the pipe when it is hot enough the solder will flow.
Yes, as well as the struts. The main reason is that nitrogen does not expand or contract with temperature changes or altitude changes.
