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.
Tolerance and Quality References Worth Naming
Arguments about quality usually come from two people reading the same drawing under different assumed standards. Naming the standard on the drawing removes most of that.
| Dimension type | Typical achievable | How to specify it |
|---|---|---|
| Feature position on thin sheet | about ±0.1 mm on small features | give a datum scheme rather than relying on implied datums |
| General linear dimensions | ISO 2768 class m, or finer where specified | state the class on the drawing |
| Edge perpendicularity | referenced to ISO 9013 tolerance classes for thermal cutting | remember that thicker plate shows more taper |
| Cut face roughness | graded rather than expressed as a single number | cosmetic parts may need secondary finishing instead |
| Batch reproducibility | held within the bands above | confirmed by first-article measurement plus an agreed sampling plan |
| Press-fit intentions | must be stated in advance | the kerf is neither zero nor parallel |
The single most effective sentence on a drawing is a tolerance class plus a short list of the dimensions actually inspected. It tells a supplier where to spend effort. A drawing with no class and no inspection list forces conservative assumptions everywhere, which is exactly why two quotations for the same part can differ so much.
Frequently Asked Questions
Which tolerance standard should I put on a laser-cut drawing?
ISO 2768 for general dimensions covers most needs, and ISO 9013 for the thermal-cut edge if the cut face itself matters. Both are widely recognised and remove ambiguity.
Do you measure every part?
Standard practice is first-article measurement plus a sampling plan or full inspection on nominated dimensions, depending on volume and criticality. Which one applies belongs in the purchase order.
Can you provide an inspection report?
Yes, against the dimensions nominated. Asking for dimensional reports on every feature when only three matter adds cost without reducing risk.
Questions about a specific part are usually faster to answer against the drawing — send it through the route below.
Practical next steps. Start with cutting capability and tolerances for the drawing review, read how parts are inspected for process context, and if you are choosing between routes, achievable tolerance bands and DFM review set out the alternatives side by side.