一批材质为16锰,直径480毫米,厚5毫米,长1.5米的筒节,由于滚制不当,焊后呈图示的形状。焊后的筒节在滚板机上用常规的方法矫圆,不起作用,用大锤矫形不仅费劲,而且影响外观。后来我们在滚板机上将上辊下压,故意把除了焊缝部位以外所有部位滚压得比规定曲率小,这样反复滚动(注意,焊缝S部位不能滚压)从而使S A group of 16 manganese material, diameter 480 mm, thickness 5 mm, 1.5 m long tube section, due to improper rolling, after welding showed a pictorial shape. After welding the tube section in the roller board with the conventional method of rounding, ineffective, orthopedic sledge is not only strenuous, but also affect the appearance. Later, we roll the roller on the board under pressure, deliberately except for all parts of the weld outside the rolling than the specified curvature of the small, so repeatedly rolling (note that the weld S site can not be rolled) so that the S