Hello.
I'm trying to solder a soft copper coil to a regular fitting and its not working, (I did already a lot of soldering and never had a problem) is there any tips or tricks for soft copper? Do I have to work with it in a special way?
Thanks for any reply.

What's "not working"? It solders the same.

Did you drain the pipe before soldering. If there is any water in the pipe and you heat it you will get steam and it will blow the solder out of the joint.

Not drawing the solder to the joint.

No water in the pipe.

There is something wrong with your technique then, because if the tubing and fittings are "proper sized" it WILL solder if you do it correctly.

If the joint was fluxed then either you aren't using enough heat or too much.

I did a couple more joints at that same time in the same mannor but only the joints at the 2 ends of the soft copper pipe did not pull in the solder.

The soft copper is new? Not previously used, correct?



Edited 1 times.

Any chance the soft copper is slightly out of round at the ends?

Its not new, was removed for remodeling and now I'm installing it again.
And yes there is a chance that its slightly out of the perfect round and I did already a few cuts trying to hold it in shape but it could still be 'very slightly' out of round.
However for now I ended up using 'Sharkbite' push-ins and everything is fine but I would still like to figure out what I did wrong, and if there is any thing special with soft copper.

you DID something wrong and there is NOTHING "special" about soft copper as far as soldering goes.

Did you sand the pipe til it was bright and shiny ?

yes