METHOD AND DEVICE FOR PREVENTING OSCILLATION OF FORGE-WELDED STEEL PIPE SKELP

摘要

PURPOSE:To prevent the uneven heating of skelp edges by adjusting the angle of guide rolls provided in the outlet of a heating furnace in the stage of producing a forge-welded steel pipe by heating locally the edge parts after heating the skelp of a blank material and forming the material to a tubular shape then subjecting the skelp edges to continuous press welding. CONSTITUTION:The skelp 8 of the blank material is heated in the heating furnace 11 and is guided by a set of guide rolls 2, 2 which are provided in the outlet of the heating furnace and cross each other. The scale of the skelp edges is removed by the air blown out of edge blows 12 and the skelp is preheated and is then formed into a tubular shape by forming rolls 13. Only the edge parts of the skelp are again locally heated by the oxygen blown out of a welding horn 14 and are press-welded by forge-welding rolls 15, by which the pipe is manufactured. The angle of the rolls 2 is adjusted in this case to prevent the uneven heating owing to the welding hole of the skelp edges to be forge-welded. The forge-welded steel pipe having excellent quality is thus produced.