Re: Radiator soldering
Use ACID core solder whenever soldering dis-similar metals, which is what you are doing when re-soldering the radiator frame (steel) to the top tank (brass). Clean off any remaining flux when finished soldering to avoid any future corrosion. Clean up with Baking Soda.
Use ACID core solder when plumbing or radiator repair. It is more aggressive than rosin core solder.
Use only ROSIN core solder when doing electrical work, as the acid core solder is corrosive and can degrade the electrical connection.
Whatever you do, don't use JB Weld or any epoxy type repair. By doing so, you will make it more difficult if not impossible to do a proper repair, as it will all need to be removed in order for the solder to bond with the base metal. If you don't have the experience or feel unsure please bring to a radiator shop.
Another note - As these parts were previously soldered together, there should be a coat of solder on both the tank and the steel frame where the parts attach. It will take very low heat and a minimal amount of additional solder to re-melt / re-flow the solder between these previously soldered parts.
Good luck with your repair
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