5 year old me wondered this learning from my dad, and I was just reminded by a video that I have no idea how the solder gets sucked into to the fittings. Why does it go into the joints? What is flux? I know how to sweat pipes together but I don’t know why it works. Does anybody know why?
In: Engineering
Solder is picky about what it sticks to, it needs very clean copper or brass. The flux cleans the metal as it boils off and the solder fills the small space between the pipe and fitting via capillary action
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