No, not shiny clean, the surface should be roughened a bit like with
CY: I've always done shiny clean.
Then wipe on waterbase flux on all contact areas to be
joined. The brass fittings will require a LOT more heat than copper
get what you want done. It's not welding, but it is significantly
hotter than simple copper work.
CY: Same temp, but it requires much more torch action to get the valve
to that temp. So, it's not signifigantly hotter in that it's the same
Remarkably, the flux will suddenly be
drawn in the void between the parts, and you'll know it worked.
CY: I apply the flux before the heat. The flux isn't suddenly drawn
in. I put the flux there.
careful not to move the parts when hot, or the solder joint can be
CY: yes,t hat's good advice.
Rather, dip in a bucket of water or hose the parts off to
quickly cool the finished joint.
CY: I wouldn't want to dip a solder joint in a bucket of water -- that
would be moving it. However, I might apply a wet rag to the joint and
let the wet rag boil and steam. With most fittings, I just walk away
and let it cool on its own. With a valve, it's a good idea to keep the
valve cool with a wet rag (small towel). So as not to damage the parts
inside the valve. But for couplers or elbows, let em cool slowly on