WELDDING LENS D20*3.5 F800

About WELDDING LENS D20*3.5 F800

A D20 3.5 F800 welding lens is a laser focusing lens used in fiber laser welding or cleaning machines. It focuses the laser beam to a precise spot for efficient processing.

Technical Specifications

• Diameter (D20): 20 mm
• Thickness (T3.5): 3.5 mm
• Focal Length (F800): 800 mm (long focus distance)
• Material: Usually high-purity quartz / optical glass
• Wavelength compatibility: Commonly ~10641090 nm (fiber laser range)
• Transmittance: ~99% (high efficiency)

Function

• Focuses the laser beam into a controlled spot
• Improves energy density and precision
• Ensures better welding quality and penetration

Applications

• Laser welding machines
• Laser cleaning machines (F800 is commonly used for cleaning)
• Sheet metal fabrication
• Automotive & industrial parts

Important Notes

• F800 = long focal length, so:
  • Larger working distance
  • Wider beam spot
  • Often used for cleaning rather than welding precision jobs
• Must be installed in correct direction (convex/flat side orientation matters)
• Needs regular cleaning/replacement to maintain performance