Shenzhen Yu-feng of solder Co. , Ltd. is a professional production and sale of flux Series: Disposable flux, Rosin flux, water-soluble flux, lead-free flux;

深圳市宇锋达焊料有限公司是一家专业生产、销售助焊剂系列：免洗助焊剂、松香型助焊剂、水溶性助焊剂、无铅助焊剂；

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Having optimized preheat temperatures, solder pot temperatures, and flux volume, the conveyor speed may have to be reduced to accommodate the solder wetting when using lead-free solder.

对预热温度、焊料槽温度和焊剂体积进行优化后，还可将传送带速度降低，以适应使用无铅焊料时的熔湿速度。

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This model considers free surface boundary, flux boundary, horizontal flow barrier, well boundary, non-linear characteristics of soils and dynamic change of permeability coefficient with stress state.

该模型考虑了自由面边界、流量边界、基坑围护连续墙、井边界、土体非线性特性、土的渗透性随应力状态的变化。

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