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I haven't had anything fail like that so not totally sure. But I would say the steel has either not been hot enough, it's been contaminated or flux hasn't done it's magic. The brass will flow out and create what's essentially a mechanical bond between brass and steel. And that hasn't happened here. The brass has sat "loosely" around the steel. This happens if the brass has been melted before it bonds with the steel rather than the steel being hot enough for the brass to flow out on the steel.
This happens a lot when you first learn how to soft solder for example. You heat the solder rather than the bits you are trying to join.
Does it make sense what I am saying?
Hulsroy
PhilDAS
Out of curiosity, what’s wrong about it? (Apart from the obvious fact that it’s failed)