制造电焊螺旋焊管的带材经常具有称之为镰刀弯的侧向弯曲,用这种带材使管子成型变坏,因带材端部衔接不好,而调节成型角度时,成型器(螺旋供料器)就可能被塞住。当采用不可调角度的辊式压紧法成型时,发现镰刀弯时就进行处理。使带卷或其一部分通过成型器,而不进行调整。此后,在供给优质带钢时,再恢复成型过程。根据rOCT8597—57允许成卷带材的镰刀弯在3米上达10毫米,而工厂中所应用的技术工艺条件是每米为1毫米。在国外工厂中,生产焊管的同样尺寸带材镰刀弯不超过 Tapes made of welded spiral welded pipes often have a side bend called a sickle bend, with which the tube becomes poorly formed, as the ends of the strip join poorly, while adjusting the forming angle, Feeder) may be plugged. When using non-adjustable angle roll forming method, the sickle bend was found to be processed. The strands or portions thereof are passed through the former without adjustment. Since then, the supply of high-quality steel, and then resume the molding process. According to rOCT8597-57 the sickle bend of the strip is allowed to reach 10 mm at 3 m, whereas the technical conditions applied at the factory are 1 mm per meter. In foreign factories, the same size of the production pipe welded strip sickle bend does not exceed