Tange Ultimate heat treatment vs brazing/welding?
Has anybody tried to braze or weld addons onto Tange prestige ultimate ultrastrong tubes? These are supposedly heat treated? Or are they air hardening like some reynolds?
I plan to modify a 26“ mtb into a mullet cargo bike (20“ front tire).
I have two frames with very mangled paint that i could use as the base. both are my size:
- mid 90ies stevens 862 with Tange prestige Ultimate ultrastrong. Sloped frame, oversized tube, externally splined down tube. Weight 2.1kg
- early 90ies Wilier with regular sized columbus thron, straight top tube. Weight 1,9kg
I feel the heavier sloped frame is stronger and would be better suited to a cargo bike. At the same time theoretically the thron is not heat treated, thick enough for brazing and careful welding. But the Tange ultimate should be heat treated which means i could destroy the treat treatment? I feel it is not that thin though especially at the head tube where i will insert and weld a turned tube extension and at the down tube where i want to add bracing for that extension.
Any frame builders with experience brazing or welding these steels? What would you recommend?