Meaning
Identification and tracking methods using laser or mechanical engraving create permanent, machine-readable data on the surface of industrial parts. Matrix code marking encodes important production details, including serial numbers, material grades, and batch codes, into a high-density two-dimensional grid. In Chinese manufacturing zones, this marking is often applied to metal castings, electronics, and automotive parts to comply with traceability standards like GB/T 31024.
The data remains legible even under harsh industrial conditions or post-processing treatments.
Application Technique
Creating these permanent markings is achieved through fiber laser engraving, dot peen marking, or chemical etching depending on the substrate. Laser engraving melts or vaporizes the surface material to produce high-contrast dark lines that are highly resistant to wear. Dot peen marking uses a carbide stylus to create a series of small indentations, which is ideal for heavy industrial castings exposed to dirt or oil.
The choice of marking technology depends on the surface finish of the metal and the expected wear during the component’s operational lifecycle.
Decoding System
Reading the marked codes involves specialized industrial cameras equipped with image processing software that can interpret the two-dimensional pattern. These scanners use multi-angle lighting to capture the light reflections from the engraved pattern, enabling successful reads even on curved or shiny metal surfaces. In production, automated readers verify the legibility of the code immediately after application to guarantee that each part has a functional identifier.
If a code fails to scan correctly, the part is redirected for rework or manual inspection to prevent the loss of batch traceability.
Compliance Standard
Enforcing tracing requirements involves adopting international and national standards that regulate the formatting, size, and quality of the printed codes. Under Chinese industrial regulations, products destined for safety-critical systems must bear these codes to allow immediate recall in case of manufacturing defects. The Ministry of Industry and Information Technology promotes these markings to prevent counterfeiting and streamline warehouse audits.
For export markets, complying with these guidelines ensures that Chinese suppliers can integrate into global automotive or aerospace supply networks. The digital database linked to these codes must store manufacturing records for several years, allowing inspectors to trace any finished product back to the specific raw material batch and manufacturing plant. This digital verification is often the first document requested during audit inspections.
