METHOD FOR MAKING POWDER WIRE IN METALLIC ENVELOPE WITH SEAM Russian patent published in 2003 - IPC

FIELD: processes for out-of-furnace treatment of steel and cast iron. SUBSTANCE: method comprises steps of forming from steel band U-shaped groove with vertical different-height walls; using groove with width equal to diameter of closed envelope of powder blank; filling groove with powder material; smoothing out and compacting powder by means of upper drive roll of rolling stand during two reduction procedures; realizing second reduction stage by means of ridge of roll having oval groove with radius equal to diameter half of closed tubular blank; then forming tubular shape with grooved seam; reducing blank in three-roll passes while lowering diameter of blank in each pass by 8%. EFFECT: significantly increased factor of filling wire with filler. 2 cl, 4 dwg