This is no Titanium, thats Titanal, was very commen here in Germany in the early 90s.
Titanal is just Aluminium with a little Titan, Mag & Copper in it. It could not be welded, so they bonded it.
The expensive frames out of titanal were ok but there were some very cheap models that broke very fast in normal use, so titanal lasted not very long for framebuilding.
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