I know nothing about welding beyond a basic idea of how it works. My random thought is, if you were to bring a stick of whatever metal your frame is made of with you on tour, would any random farmer with a stick welder theoretically be able to repair your broken frame? Or are the welders of different materials completely different? Like you can’t weld AL with a steel welder or something? Maybe concerned touring folks could start keeping some backup steel, AL, Ti in their steerer tubes or something.