Direct Part Marking: QR and Data Matrix on Metal and Industrial Parts

1. Why DPM

Labels burn, peel, or wear off in harsh environments. Direct part marking engraves the symbol into the surface so it lasts for the life of the part.

2. Methods

* Laser marking: High precision, small modules, good for electronics and medical parts. * Dot peen: Pressed dots into metal. Works on rough surfaces, and modules are dots rather than squares. * Chemical or electrochemical etching: Good contrast on stainless steel.

3. Reading Challenges

Reflective, curved, or low-contrast surfaces need controlled lighting and industrial imagers. Quality guidance for these marks is given in ISO/IEC TR 29158.

4. Design Tips

Use Data Matrix where space is tight, error correction at the higher end, and verify every mark with a dedicated verifier rather than a phone.