The remaining 20 % of the acetylene production is principally used for oxyacetylene cutting, heat treating, and welding.
乙炔生产的剩余20%主要用于氧乙炔切割 、 热处理和焊接.
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。
base metal both sides of welding to be preheating by oxyacetylene welding & cutting torches baking method.
采用氧乙炔割炬烘焙方法对焊缝两边母材进行预热。
Cutting : Oxyacetylene cut off the castings from gate stick.
用氧气-乙炔焰从浇棒上切下铸件.
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