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。
During the process, a film of varying thickness covers the surface of the metal.
在此过程中，一变化着厚度的膜覆盖在金属表面上。
During the process, a film of varying thickness covers the surface of the metal.
在此过程中，一变化着厚度的膜覆盖在金属表面上。
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