MinConst said:Is there a trick to this? I have no problem sweating new copper but when I have to tie into old copper pipe I have a hard time getting a good joint.
MinConst said:I will try the tinning. What I see is that the solder does not flow. I have to heat the ******************** out of the joint and even then it doesn't seal. I guess it might be that I'm not cleaning enough. Thanks for the tips. I will try them.
GMW said:If by old copper you mean existing, it could be water still in the lines. That has happened to me several times. It doesn't take much water for it to mess up a joint. Even if it seems dry, heating up the pipe can cause water to appear. I have used the white bread trick several times with great success. Good luck.
Also do you guys use propane or mapp gas? I switched to mapp gas and have had better luck since. Thanks.
You may have considered this but some H2O in the line makes steam pressure and if it has no release it will push out through the last joint. It took me a few days to learn that as a young bootleg plumber. I noticed the real plumbers didn't spend so much time on a joint and never built up pressure. For a while I always made my last joint a union but now a open valve does the trick.RTMinConst said:Is there a trick to this? I have no problem sweating new copper but when I have to tie into old copper pipe I have a hard time getting a good joint.