So before welding, the process flame cutting groove is feasible.
所以，焊前直接采用火焰切割坡口的工艺可行。
If oxyacetylene flame or plasma is adopted, surface coat that can impact welding quality shall be removed after cutting.
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。
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。
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