Precautions for leak detection of vacuum coating equipment

Precautions for vacuum leak detection of vacuum coating equipment are as follows:

① First of all, we must figure out whether the tested piece can withstand positive pressure and how much pressure it can bear, so as to decide whether the gas leak test method can be used and how much pressure can be filled with gas.

②Before leak detection, the welding seam should be cleaned carefully and carefully to remove welding slag, oil and dust.

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③ The light at the leak detection site should be sufficient, the background in the sink should be dark, the water should be clean and transparent, and there should be no mist on the water surface.

④The test piece must be inflated first, and then put into the water, otherwise if there is a large leak, the water may enter the test container, and the small hole may be blocked by water. Before entering the water, use the listening method to check for large leaks. After removing the large leak, put it in the water, otherwise it will affect the detection of small leaks.

⑤ When the test piece is placed in water, bubbles may appear on the surface of the test piece. If these bubbles are removed or the bubbles no longer appear after piercing, it can be judged that there is no leak in the original bubble. If the bubbles appear regularly and continuously, there will be leakage holes where bubbles are generated.

⑥ The test piece should be kept stable in the water, and then observe after the water surface has calmed down.

⑦ The inspected part should be as close as possible to the water surface.

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⑧Mark the leak in time. When there are large leaks, check the small leaks after repairing.

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