究其原因是由于钢中大量的氧化夹杂物使得其塑性、韧性及疲劳强度降低、加工性能变坏所致。

The reason was that a mass of oxidation inclusion in steel which induced low ductility, toughness and fatigue intensity, and finally had bad machininged capability.

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降低焊接线能量时，将降低熔敷金属中的氧含量及其氧化夹杂物的数量和大小，从而提高熔敷金属的韧性。

Decreasing welding thermal input will decrease the oxygen content and the number and size of oxide inclusions, and it improves the toughness of weld metal.

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研究了复合精炼对铝硅合金熔体的净化效果，并介绍了铝硅合金熔体中主要氧化夹杂物与气体的存在形态及其相互作用。

The purification effect of Al-Si melt by composite refining technique was studied, the main existing form and its interaction of inclusion and gas in Al-Si melt were introduced.

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