改进后 的焊料合金提高了其润湿性能和焊点强度。

The solder alloy after the improvement improves wetting property and welding spot strength.

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试验结果表明，焊点强度满足要求，熔核尺寸符合要求。

The results show the strength and the dimension of spot meet the requirements.

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裂纹的产生导致了两种焊点强度的降低，对其电性能的影响却甚微。

Furthermore, the formation of cracks results in the degradation of solder joint strength, but affects mildly to the electrical properties.

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