Learn about quality control standards for laser-cut parts, including dimensional tolerances, edge quality criteria, inspection methods, and documentation requirements.
Introduction
Quality control in laser cutting is about building a system that consistently produces parts meeting customer specifications. At Fulei Metal, we serve clients across Europe, North America, Japan, South Korea, and Southeast Asia, each with their own quality expectations.
Dimensional Tolerance Standards
Standard Tolerances
For external dimensions: plus or minus 0.1 mm for materials up to 3 mm, plus or minus 0.15 mm for 3-6 mm, plus or minus 0.2 mm for 6-12 mm, and plus or minus 0.3 mm above 12 mm. For internal features: similar ranges. Hole position relative to edges ranges from plus or minus 0.15 mm for features up to 100 mm to plus or minus 0.5 mm above 600 mm.
ISO 2768 Standards
ISO 2768-mK (medium) is common for general fabrication. ISO 2768-fH (fine) for precision applications.
Geometric Dimensioning and Tolerancing
GD&T per ISO 1101 or ASME Y14.5 provides precise specification. Common callouts include flatness, perpendicularity, position, and profile.
Edge Quality Standards
ISO 9013 Standard
ISO 9013 classifies laser cut edges based on perpendicularity tolerance and roughness. For most industrial applications, Class 2 or 3 is acceptable.
Dross Criteria
Classified as no dross, light dross, medium dross, and heavy dross. Standard requirements typically specify no dross or light dross.
Inspection Methods
Dimensional Inspection
Calipers at plus or minus 0.02 mm accuracy. Micrometers at plus or minus 0.001 mm. Pin gauges for holes. CMM at plus or minus 0.005 mm.
Edge Quality Inspection
Visual inspection, surface roughness testers, and microscopes.
Flatness Inspection
Surface plate and feeler gauge. CMM for precise measurement.
Quality Control Process
First Article Inspection
Every production run begins with FAI. The first part is fully inspected including all dimensions, edge quality, flatness, and visual appearance. Only after approval does production continue.
In-Process Inspection
Periodic inspections every 10-20 parts verify ongoing quality. Results are recorded in inspection logs.
Final Inspection
Full dimensional checks, visual inspection, quantity verification, and packaging inspection before shipment.
Inspection Reports
For international clients: dimensional data, material certificates, photographic evidence, and inspection signatures.
Statistical Process Control
For high-volume components, SPC provides ongoing monitoring through control charts and capability analysis. A Cpk of 1.33 or higher is typically required for automotive and aerospace.
Common Quality Issues and Prevention
Incorrect dimensions: regular calibration, proper kerf compensation, first article inspection. Poor edge quality: optimized parameters, regular maintenance. Warped parts: proper cut sequencing, stress-relieved material. Surface damage: protective film, proper handling.
Conclusion
Quality control in laser cutting is a systematic effort spanning from parameter optimization to final inspection. At Fulei Metal, our quality system is designed to meet demanding international requirements with comprehensive inspection processes and detailed documentation.