Laser welding in which is used develop gas protection from through gland. To pressure out in GongJian, many men do not know why must protect gas under with the guo. From technicians for them, laser welding. Welding, does not need protection From:

(1):It can protect the focusing lens from metal vapor contamination and liquid droplets sputtering

The protective gas can protect the laser welding machine focusing lens from metal vapor contamination and liquid droplets sputtering, especially in high power welding, because the ejecta becomes very powerful, it is more necessary to protect the lens.

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