熔合比是指熔焊时，被熔化的母材在焊缝金属中所占的体积百分比。焊缝金属是由熔化的母材金属和填充金属所组成的。也就是熔化的母材金属占据整个焊缝金属的百分比。
减小熔合比是防止裂纹产生的关键。
The way to prevent the crack is to reduce the penetration ratio.
认识到溶解度的气体是更大的，在液体状态，比在固体状态下，受焊缝孔隙率是相关的熔合区的讨论。
Recognizing that the solubility of gas is greater in the liquid state than in the solid state, the subject of weld porosity is relevant to fusion zone discussion.
熔合区的显微硬度比母材高，随着功率的增大，显微硬度增大的区域增宽。
Microhardness test showed that hardness increased toward the center of the welded zone and as the irradiation power increased, the range of hardness increased was expanded.
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