Welded Wire Splices 1966 Dodge Dart?

In my 1965 Dart, that welded wire connection on the black ALT wires was green with corrosion. I cleaned up the outside of the wires as best I could with a wire brush, then added solder. That is typical for bare copper stranded wire to corrode and why better stranded wire has the copper "tinned", as they also do with many circuit board copper traces. Wish the factory had dipped that junction in solder. In my 1964 Valiant, I recall that welded connection was still shiny copper. The Dart had lived a harder life since I found more corrosion everywhere.