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How to Avoid Burning Protective Lens

When using high power for welding, it’s common to encounter issues with burning the protective lens.

How can we reduce this problem?

Firstly, it’s important to understand that laser welding heads use optical components, including protective lenses, focusing lenses, and mirrors. During the welding process, spatter can occur, inevitably causing lens damage.

If the frequency of lens burning is too high, we can troubleshoot the following aspects:

Increase the pressure of the protectivegas: Normally, a gas flow around 15L/min is sufficient for welding. Increase it to 20-25L/min. Higher pressure and gas flow effectively prevents spatter from entering the laser head. Note that this means more shielding gas is required, increasing costs.

laser welding gas regulator
laser welding gas flow

Check the Laser power used: If the welding power is too high, it increases the spatter. Ensure that the power is not high for the welding task.

Inspect the focus extension tube setting: Generally, the focus should be around the “0” mark. If the focus extension tube is too short, it can lead to lens burning. Find the zero focus position and extend it slightly outward. This can help prevent lens burning. (Note: Zero focus may not always be at the “0” mark. Refer to guidelines on how to find the zero focus point.)

welding 0 position
laser welding angle

Welding technique: It is recommended to use a 45-degree welding technique, which helps reduce the amount of spatter entering the laser head.

Cleanliness of the material surface: The cleanliness of the material surface affects the amount of spatter. Clean off any dust, oil, or other contaminants from the material surface before welding.

Adjust the laser settings: Lower the laser power appropriately, increase theLASER ON PROGRESSIVE TIME, and reduce the SCAN SPEED to 200mm/s. This can help minimize spatter and protect the lens.

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