Hi mike at Dialled bikes,, yeh I've got some pics… I will stick some on tomorrow. and it is an alloy not cp… 😀
It's an Alpha/beta alloy of Ti 4-6%Al 2%Mn
The forming and extrusion process of these tubes also increases the tensile strength as well.
The finishing does also make a difference due to the fact it's the same process that Rolls Royce use on their turbine fan blades to UK Aerospace/Mil-spec Standard and certification for the same results… creating a microscopic defect tolerant surface with increased fatigue resistance.
The heat treatment is made possible to the most part due to the Mn… and other factors!
single pass welds… ltd exposure to high temps… less weld…and other stuff 😀
Zone
Oops forgot… agree with finishing not helping this one though,,, looks to start at the underside of the weld point…could be where the weld started and finished…i.e weak spot. to much heat??? Hard riding…??? Contaminant could also be it… maybe 😀