The strip width deviation affects the quality of welded steel pipe

Frequency welded pipe production process, affecting the quality of the pipe element has multiple aspects, mainly for raw materials, welding technology and roll operator which is beginning to adjust. Key to look at the raw geometric dimensions. Effect of Geometry on the quality of steel strip when the strip width is less than the tolerance, the pressing force is reduced when the welded steel pipe, steel pipe weld welding so weak, cracks or open tube. When the width of the strip is greater than the tolerance, the pressing force is increased when the welded steel pipe, steel pipe welds appear beak, lap welding and other welding defects or burrs. Therefore, fluctuations in the strip width, not only affects the accuracy of the outer diameter of the steel pipe, but also seriously affect the quality of the surface of the steel pipe. Requirements section of the same thickness difference does not exceed the predetermined value of the steel pipe, which requires a high degree of uniform wall thickness of the pipe, fluctuations in the thickness of the strip, the same volume will be transferred to the allowable value of the wall thickness of the finished steel strip thickness difference exceeds the difference so that a large number of steel tube wall thickness exceeds the allowable deviation and scrap judgment. Thickness fluctuation of not only affects the accuracy of the thickness of the finished steel. Meanwhile, the strip of varying thickness, the steel pipe during welding, extrusion pressure and welding temperature instability, resulting in unstable quality weld pipe welding. Further, since the interior of a steel material defects exist sandwich, impurities, such as trachoma, it is also an important factor affecting the quality of steel. Therefore, before steel welding, to check each roll strip surface quality and geometry of the strip does not meet quality standards, not production, so as to avoid unnecessary losses.