青云翻译

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Before welding chemical or mechanical means should be used for strictly surface cleaning, clearing the surface oxide film.

Before therefore welds should use chemistry or the mechanical method carries on the strict superficial cleaning up, eliminates its superficial oxide film.

Therefore welding before using chemical or mechanical methods should be carried out strictly surface cleaning, removing its surface oxide film.

Before welding chemical or mechanical means should be used for strictly surface cleaning, clearing the surface oxide film.