So, after a bit of an enforced break (work commitments etc pah!) this last fortnight I've been getting down to some serious brazing practice. Using the correct flux has, of course, made all the difference. Done quite a few cheap practice lugs and the repetition seems to be paying off - post mortem dissections reveal improved penetration. So I'm fairly pleased with my progress..........

.......however, there is one thing in particular I'm a bit worried about. Despite achieving what appears to be decent penetration (clear silver line visible through cross sections right through the lug) I'm finding that I'm able to (where I can get a grip with a pair of pliers on a corner that hasn't properly flowed), with a bit of effort, peel the lug/tubing apart (I'm talking thin 3 - 4mm cross section) even where the silver has clearly flowed???

So either I'm expecting too much of the silver filler, or more probably I'm still doing something wrong. Is this a case of fried filler?

Also, should I be looking to flow the mitre?

As always, advice greatly appreciated.