Having knowledge of metallurgy and joining similar/dissimilar metals, that was a starved braze. A proper copper brazed joint should have a fillet of copper visible around the full perimeter of the join. If done properly, the joint should be close in strength to the metals being joined. Clearly, that join was starved and poorly prepared. Such a shame, too. To re-braze that operating handle to the bolt, it will most likely need machining afterward.