The endless rolling adoption in order to meet the needs of the production of hot rolled sheet. Compared with the conventional batch rolling process, rolling is a cost-effective process. In March 1996, JFE Chiba plant in Japan first introduced the endless rolling technology. Followed by Nippon Steel, a large factory in April 1998, are beginning to use the endless rolling technology, and put into a high-power laser welding system. POSCO in
MH (Mitsubishi - Hitachi) cooperation to develop a solid connection new process to meet the prerequisite of endless rolling three (short connection time, the entire height of The connection is strong, easy to repair) World pipe network reported that the world's steel pipe network to provide the world's steel pipe network editor . The new process uses a static connected devices than any other process using Dynamic Link devices can be significant savings in the production line space.
Rolling solid connection new process based on an innovative solid-state connection principle, the blank connection time is less than 1 second (actually less than 0.5 seconds). Connection process in Step 4, part of descaling, lap shear connection and remove the cutting head. Two billet shear surface oxide skin, immediately after the two newly formed surface shear connected together. Then work together to contribute to the shear force perpendicular to the interface, the heat generated by friction between the two planes of newly formed auxiliary connection. In addition, the unique design of the edge of the shear tool to prevent the metal flow to the outside to increase the bonding forces. The connection process, the absorption of air in the plane with high pressure to exclude towers to prevent the connection surface is exposed to the atmosphere. Two surface shear caused by severe deformation, a new surface (no oxide scale) and thermal. In the process, the upper and lower tool is to pay the tower World Pipe network informed, cross the length of the tower is one of the most important process parameters. The shearing process in the surface of the small cross-tower district severe deformation, the area of the oxide scale and the connection area ratio from 100 percent to 10 percent, thereby forming a solid connection in the entire height.