The reason of eccentricity of straight welded steel tube
When the whole or more than half of the steel tube blanks show misalignment, it is usually because: 1. The opening seam is not adjusted properly; 2. The seam pressure roller is not adjusted properly and there is no rounding; 3. The edge is not pre-bent in place. When the head or tail of the billet shows misalignment, it is usually because: 1. The orientation of the import and export rollers is wrong; 2. The ring frame is wrong; 3. The seam pressure roller is not well rounded, and the orientation error of a single pressure roller; 4. The molding is not good, and the difference between the two ends of the formed tube blank is large; 5. The slit width of the opening is above 150mm; 6. The pressure of the hydraulic system fluctuates.