In laser welding systems, the protective lens is a consumable component, yet it plays a critical role in welding quality, optical system safety, and the long-term stable operation of the entire
machine.
Due to the high energy density and intense spatter generated during laser welding machine portable, protective lenses are inevitably exposed to contamination and wear. Therefore,
standardized maintenance procedures and correct replacement practices are essential.
I. Why Is Protective Lens Maintenance So Important?
During actual welding operations, metal spatter, fumes, and reflected laser energy directly impact the surface of the protective lens. If the lens condition deteriorates, it may lead to:
Reduced laser energy transmission efficiency and poor weld formation
Laser beam attenuation, resulting in unstable welding depth and consistency
Local overheating of the lens, potentially causing cracking or breakage
Damage to downstream optical components and increased maintenance costs
For this reason, whenever welding quality declines or laser output appears abnormal, the protective lens should be inspected immediately.
II. Importance and Basic Principles of Lens Cleaning
The quality of protective lens cleaning directly determines its service life.
Improper cleaning may cause reduced transmittance or even irreversible damage to the lens coating.
Basic cleaning principles:
Maintain a clean and controlled environment throughout the process
Avoid direct contact between bare hands and the lens surface
Never use ordinary paper towels, cloths, or abrasive materials to clean lenses
III. Preparations Before Cleaning
Before starting, ensure the following preparations are completed:
Operator Preparation
Wash hands thoroughly with detergent and dry completely
Wipe hands again with alcohol-soaked cotton and allow to air-dry
Wear finger cots or clean rubber gloves throughout the operation
Tools and Materials
Air blower (rubber bulb)
Dust-free, non-adhesive tape
Lint-free degreased cotton
Industrial alcohol with purity above 99%
Lens cleaning paper
Finger cots or rubber gloves
IV. Protective Lens Removal, Inspection, and Cleaning Procedure
Removing the Protective Lens Assembly
In a relatively clean, low-dust environment, remove the protective lens housing screws and carefully take out the lens holder.
Inspecting the Protective Lens
If only light dust or minor contamination is present, cleaning is sufficient
If burn marks, cracks, or coating damage are observed, the lens must be replaced immediately and must not be reused
Cleaning the Lens
Moisten lens cleaning paper with a small amount of anhydrous alcohol and gently wipe from the center outward in a single direction. Avoid repeated back-and-forth wiping.
V. Do Not Overlook Seal Inspection
While cleaning or replacing the lens, always inspect the spring-loaded sealing ring beneath the protective lens:
Any scratches, deformation, or aging will compromise sealing performance
Poor sealing may lead to contamination and instability
If any abnormality is found, the sealing ring must be replaced immediately
VI. Reinstallation and Final Checks
Clean the lens housing opening and inner side of the cover with alcohol-soaked cotton
Ensure no dust or residue remains inside
Insert the protective lens holder quickly and steadily into the housing
Tighten screws evenly to avoid uneven stress
VII. Important Operational Notes
If laser output suddenly weakens during welding, the protective lens may be contaminated or cracked
Stop operation immediately and inspect the lens to prevent further damage
Different models of handheld laser welding heads may have varying protective lens structures and replacement procedures
For detailed manuals or replacement tutorials specific to your welding head model, please contact our technical service team at any time.
Conclusion
Proper maintenance of protective lenses not only improves welding quality but also extends the service life of the optical system and the entire machine.
Incorporating regular lens inspection and cleaning into daily maintenance routines is a fundamental requirement for ensuring stable, efficient welding machine laser performance.
Professional maintenance starts with every single protective lens.
Post time: Feb-04-2026
