T-PUT Union RV 71 description: Union RV 71 is a seamless copper coated rutile flux cored wire with fast freezing slag for all-position welding, according to EN ISO 14175, when using mixed gas M21, M31 and C1. It shows good mechanical-technological properties. The outstanding welding properties are the stable arc, the good modelling characteristic, the very low spatter proportion, finely rippled and notch free weld interface, and good slag detachability.