http://www.rcdon.com/html/vertical_boiler_project.html
This page tells of the choice of solder:
http://www.rcdon.com/html/vertical_boil ... 4_17_.html
...and, on this page:Now it is quite possible that this joint would be leak free as-is considering that I riveted the heck out of it !!! However I will have a hard time fixing any leaks should they occur when I am boiler testing. To ensure the joint is sealed I will be adding a silver solder “caulk” to simply seal the joint.
The solder I am using is a 1% Tin, 97.5% Lead and 1.5% Silver solder that has a melting temperature of 588° F. This is about a 160° hotter than a standard silver solder which will help keep this solder solid during the consecutive soldering steps needed to seal the boiler tubes and bushings. This type of silver solder has a tensile strength of about 1750 PSI @ 300° F which is suitable for caulking joints....
http://www.rcdon.com/html/vertical_boil ... 4_23_.html
Does anyone have an opinion about the choice of solder? Comments?To solder in the first side of the boiler tubes I will be using a high strength non-lead silver solder. This solder has a tensile strength of about 9500 PSI and is comprised of 96% Tin and 4% Silver with a melting point of 430° F. This temperature will be ideal to seal the boiler tubes without melting the end plate caulking I had soldered earlier....
Orrin