I think they heat the frame to above the melting point of alu >660C but below the melting point of steel ~1250C. Sounds a bit terrifying but apparently pretty reliable. Would also mean taking cables brakes etc off the frame.
Sounds like a good way to loose that seat clamp and any cable guides and even brake bridges etc that are silver brazed in place.
@SlimCharles started
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I think they heat the frame to above the melting point of alu >660C but below the melting point of steel ~1250C. Sounds a bit terrifying but apparently pretty reliable. Would also mean taking cables brakes etc off the frame.