当采用氧乙炔焰或等离子切割时，切割后必须除去影响焊接质量的表面层。
If oxyacetylene flame or plasma is adopted, surface coat that can impact welding quality shall be removed after cutting.
乙炔生产的剩余20%主要用于氧乙炔切割、热处理和焊接。
The remaining 20%of the acetylene production is principally used for oxyacetylene cutting, heat treating, and welding.
管道焊接不得使用氧乙炔焰焊接。
焊接与切割1949年，北京已有气焊、电弧焊及氧乙炔火焰切割等手工作业。
Welding and cutting in 1949, Beijing has geo-drilling, electric welding and cutting etc oxyacetylene flame manual operation.
焊接与切割1949年，北京已有气焊、电弧焊及氧乙炔火焰切割等手工作业。
Welding and cutting in 1949, Beijing has geo-drilling, electric welding and cutting etc oxyacetylene flame manual operation.
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