2Pcs D20×4.5 F200 Laser Welding Protection Lens Focusing Lens

About this item

• D20mm outer diameter, 4.5mm thickness, available in F200 focal length. Exact replacement focusing lens fits perfectly for CQWY SUP‑20/21/23, Qilin handheld laser welding head, easy to install without modification
• Anti‑reflection coated focusing lens features low laser light absorption, stable thermal performance, reduces over‑heating damage and delivers consistent welding spot for long‑time handheld welding jobs
• F150 lens creates smaller focus spot for thin metal precision welding; F200 lens provides larger depth of field, ideal for thick‑plate welding. Please match focal length with your welding torch tube length
• Made of high‑grade JGS1 fused‑silica quartz substrate, double‑sided anti‑reflection coating optimized for 1064 nm fiber laser. Low light‑absorption and high‑laser‑damage‑threshold for long‑hour handheld welding operation
• Comes with 2 pieces focusing lenses as spare consumables for your laser welder, great for workshop maintenance and reducing unexpected downtime during heavy‑duty welding work