The underwater welding using a water jetcurtain to prevent the damaging effect of water on arc and weld is a practical way to im- prove the"wet"weld quality.
利用水射流的屏蔽作用，消除水对电弧和焊缝的不利影响，是提高水下湿法焊缝质量的一种有效方法。
2
A brief introduction is given for different complex water curtain construction techniques, such as pendular jetcurtain and grouting curtain, to cope with different geological conditions.
同时，简单介绍了针对不同地质对象采取的摆喷帷幕和注浆帷幕组成的复合式截水帷幕施工技术。
3
An air curtain was designed according to the jet theory of fluid mechanics and the role and feature of air curtain to separate dust in a fully mechanized face.