My opinion is Gary your procedure has accomplished the best of both worlds ... Lapp Joint - spot welded and the lapp joint is welded on the edge. Perfect ...
The LEAD issue .. well the key to not warping the metal is to control the heat. To weld or solder lead pipe or sheet lead the lead has to have an insulator on the back side or the pipe has to be sealed at the ends .. this enables the heat to stay in the metal and not cool fast. so on sheetmetal I would think maybe a backing of some sort would help .. cant say I have plans to use lead ...
One thing for sure is on 9138 the paint in the lead areas has whats called CROWS FOOT .. meaning the paint is cracking. For what its worth my opinion is the paint dosent stick great to lead ..
Doug ... your a PLUMBER ??? I'm sure I know you then ... LOL
Ron
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