Bismuth does lower the melting point and improves wetting but has limitations.
铋确实能够降低熔点，并提高熔湿特性，但是它也具有局限性。
The solder alloy after the improvement improves wetting property and welding spot strength.
改进后 的焊料合金提高了其润湿性能和焊点强度。
To analyze the datum from the industrial test and production assess, we could find the quality of leaf wetting improves evidently when the system is used.
通过对现场工业性试验数据和生产考核数据进行分析发现，系统投入使用后，二润的润叶质量明显提高。
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