无心冷弯薄壁焊接钢管时,弯模设计的合理与否是影响弯曲质量的主要因素。过去,我们使用的弯模,其模沟是同钢管等径的半圆所组成(图1)。弯出的管件易产生内 Unintentional cold-formed thin-walled welded steel pipe, the bending mold design is reasonable or not affect the bending quality of the main factors. In the past, the bending die we used was composed of a semicircle of equal pipe diameter (Figure 1). Curved tube easy to produce inside