They might be using silver solder or silver braze to actually fuse the brass and steel parts together.
Depending on the alloy of silver used, 1100F might enable you to remelt/reflow brass partst that had beened "tinned" with an appropriate grade of silver solder.
I doubt seriously if simply heating brass to 1100 and then touching it to steel would result in a fused/bonding at the interface without the benefit of an appropriate solder or brazing filler material.


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