After reading the "how do they make steel wool" thread above has got
me wondering..

How do they make copper "solder ring" fittings?

I can see that the actual copper part could be bashed out by a big
machine but how do they get the solder into the groove on either end?

You could sit there for days trying to get the solder into the groove
with a blowlamp/soldering iron and never achieve it.

The joints don't appear to have any discolouring due to heat.

So..how do they do it?

sponix

In article ,
sPoNiX wrote:
How do they make copper "solder ring" fittings?

I can see that the actual copper part could be bashed out by a big
machine but how do they get the solder into the groove on either end?

You could sit there for days trying to get the solder into the groove
with a blowlamp/soldering iron and never achieve it.

The joints don't appear to have any discolouring due to heat.

I'd imagine it's cold rolled into place.

--
*Arkansas State Motto: Don't Ask, Don't Tell, Don't Laugh.

Dave Plowman London SW
To e-mail, change noise into sound.

Good ones have the groove tinned before the lead free solder is cast
in. The inside is then rebored to size. The lack of discolouration is
due to the fact that the solder melts at a lower temperature than
needed to discolour the copper and the whole lot is burnished to finish.