Semi-Flexible Track is designed for circumferential, irregular, and straight-line welding applications with Rail Tug, Rail Titan, and Rail Bull tractors. The track allows uninterrupted welding on workpieces with a minimum radius of 5.0m (without track deformation) Semi-flexible tracks can be used on both ferrous and non-ferrous materials through magnetic or vacuum units to allow travel in any plane or position. (see possible unit options below).