全焊接阀体的球阀，可以直埋于地下，使阀门内件不受侵蚀，最高使用寿命可达30年，是石油、天然气管线最理想的阀门。

Full welding of the ball valve body can be directly buried in the ground, so that in case the valve from erosion, the maximum service life of up to 30 years, oil, natural gas pipeline valve ideal.

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这种加工设备用于工件(28)上的材料侵蚀或工件(28)的材料连接，尤其用于工件焊接。

Such a machining device is used to remove material from workpieces (28) or for connecting workpieces (28) by bonding, especially by means of welding.

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结果表明，表面处理过程(研磨、抛光、侵蚀液体及工艺等)对镁合金硬度的影响很大，直接影响到“焊接工艺-硬度”之间关系。

Surface treatment such as grinding, polishing, etching influences significantly the hardness of magnesium alloy and the relationship between welding process and hardness.

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