The test results indicate that cooling beginning temperature after brazing is most influential to its joint strength, then the cooling hours and finally the way of dehydrating before brazing.

试验结果表明，焊后炉中冷却始温对焊缝焊接强度影响最大，冷却时间次之，焊前脱水方式对焊接强度影响最小。

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The uo –transmission device with the unique water cooling to reduce speed, universal joint , the low rate of malfunction. it is easy to service.

上传动装置采用独特水冷减速器，万向联接，故障率极低，易于维修。

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It should be payed much attention to fast cooling because it can decrease the defects of PCB assemblies and promote the reliability of solder joint.

研究现状表明快速冷却有助于减少焊接缺陷，提高焊点可靠性。

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