oxyacetylene flame hardening

例句：

1. 1. The process of oxyacetylene flame hardening is crucial for the quality of the final product.
   氧乙炔火焰硬化过程对于最终产品的质量至关重要。
2. 2.During the oxyacetylene flame hardening process, the material undergoes a chemical reaction that results in a hardened surface.
   在氧乙炔火焰硬化过程中，材料经历化学反应，导致表面硬化。
3. 3.The oxyacetylene flame hardening technique is widely used in metalworking and machining industries due to its efficiency and precision.
   由于其高效性和精确性，氧乙炔火焰硬化技术在金属加工和机械制造行业中得到了广泛应用。