| 摘要 |
PURPOSE:To improve the productivity and yield of a clad billet by forming continuously a steel strip to an open pipe, welding both edges thereof and pouring a molten metal of a material different from the material of the steel strip into the hollow part of the pipe in the welding position. CONSTITUTION:The steel strip 1 is continuously formed to the open pipe 4 by forming rolls 2, 3 and V-shaped edges 5 and heated and melted by a high-frequency welding machine, etc. (not shown) on the upper stream side of squeezing rolls 8. The edges 5 in this state are pressurized and welded by the rolls 8 and the pipe 4 having the welding position is graded downward to the prescribed extent. The molten steel 6 consisting of the different material is poured into the hollow part of the pipe 4 and the inside peripheral surface of the strip 1 is melted by as much as the prescribed thickness by the quantity of the heat retained therein. The solidification is thereby progressed while the steel strip 1 and the molten steel 1 are metallurgically bonded. The clad steel billet 7 which is thoroughly solidified is cut to a prescribed length and the stock for a clad steel bar or seamless clad steel pipe is obtd. |
