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I've been soldering electronics since 1989. I soldered my first pipe in 1993 and feel I'm pretty good at it. Any time I've soldered pipes, valves etc it generally goes beautifully.
It's been a few years since I've done any plumbing but I still do electronics all the time. I feel I'm good with knowing my temperature and how the solder behaves and what to expect.
I do some brazing from time to time too and always liked my joints.
Today I decided I solder some Uponor fittings into some copper tees. I used my Hercules Climate smooth flux and Lenox solder from 2011 and got everything beautifully clean with a light film of flux.
I expected sexy results.
What I got was not so great. It was like the solder didn't really want to stick to the brass. I got it to flow and hopefully they won't leak but that stunk.
I honestly don't think it was my technique. What gives?
Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment