当板材卷成圆筒焊接后，焊缝从较微观的角度分析：它是直边而不是弧边它是厚

When the sheet into a cylindrical welded seam from the microscopic point of view of more: <br>it is not the straight side edge arc <br>which is thin rather than thick edge side <br>which is rough and not smooth <br>whole, not only the upper and lower The friction of the roller increases. And the torque of the lower roller is also increased. <br>Therefore, we must polish the weld before the rounding, not too thick. <br>Secondly, the rolling must be carried out step by step. <br>These require not only theoretical calculations, but also empirical guidance. 

When the sheet is rolled into a cylinder welding, the weld is analyzed from a more microscopic angle:<br>It is a straight edge, not an arc.<br>It is thick rather than thin.<br>It is rough rather than smooth.<br>Taken together, it not only increases the friction of the upper and lower rollers. And the torque of the lower roller swells is increased.<br>Therefore, we should polish the welds before rolling round, not too thick.<br>Second, the roll must be rolled in a step-by-step manner.<br>These require not only theoretical calculations, but also empirical guidance. 

When the plate is rolled into a cylinder and welded, the weld seam is analyzed from a microscopic point of view<br>It is a straight edge, not an arc edge<br>It's a thick edge, not a thin edge<br>It's rough, not smooth<br>Generally speaking, it not only increases the friction between the upper and lower rollers. And the torque of the lower roller is also increased.<br>Therefore, we should polish the weld before rolling round, not too thick.<br>Secondly, rolling must be carried out step by step.<br>These need not only theoretical calculation, but also experience guidance. A kind of