03-10-2017, 04:23 PM
(This post was last modified: 03-10-2017, 04:43 PM by Duncan Grimmond.)
My answer was regarding a radiator cowl which I understood to be the brass surround. Lead has the unfortunate property of attacking metals above it in the periodic table at high temperature which is why it was used in assaying silver and gold (cf. cupellation). If you heat to brazing or silver-soldering temperature a gold,silver or copper-alloy article which has been soldered with a lead or even a lead free tin solder, the lead will eat its way into or even through the metal leaving a cokey mess.
Radiators are not run at high temperatures and I think that trying to silver-solder a radiator header tank without removing all traces of lead solder would damage the brass.
Radiators are not run at high temperatures and I think that trying to silver-solder a radiator header tank without removing all traces of lead solder would damage the brass.