Steel rail has 3 rail base defects: bottom defect, scab and bottom crack.
钢轨轨底缺陷有三种：底伤、结疤和底裂缺陷。
Seam surface defect after grinding or thickness is lower than base material after mechanical treatment.
打磨焊缝表面缺陷或机械损伤后的厚度小于母材的厚度。
Seam surface defect after grinding or thickness is lower than base material after mechanical treatment.
打磨焊缝表面缺陷或机械损伤后的厚度小于母材的厚度。
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