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。
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。
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。
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