horizontal end feed joint problem.

[davenport.neil]

Whilst recently altering the boiler flow and return to accommodate an underfloor heating manifold I de-soldered some joints and found that there were areas were the solder had not fully run. They were always on the top side of a horizontal joint and although they had not leaked as they were less than a third of the joint depth and at the back of the joint I am wondering if I am doing something wrong?
I always thoroughly clean pipe and socket, use la-co flux and lead solder for CH pipes.

Any advice?

 

[Guest123]

Are you applying the solder to one area only? Are you heating evenly around the full diameter of the joint?

 

[lame plumber]

did not leak, can't see a problem myself. try using hotter gas aecetylene propane mix.