The Short Answer: Yes, But With Limitations

While CO₂ lasers (10.6μm wavelength) aren't ideal for cutting solid metals, they can engrave certain metal surfaces when properly configured. Here's your complete guide to metal engraving with CO₂ lasers.

How CO₂ Lasers Interact With Metals

The Physics Behind It

• CO₂ lasers primarily reflect off bare metals (aluminum, steel, copper)

• Requires surface treatments to enable absorption:

  • Coatings (paint, anodization)

  • Laser-marking compounds (Thermark, Cermark)

  • Oxidation techniques

Metals That Work Best

3 Effective Methods for Metal Engraving

1. Anodized Aluminum Engraving

• Process: Laser removes colored anodized layer

• Result: Bright white marks

• Best For: Serial numbers, barcodes, logos

• Power Needed: 30W+ at low speed (200-400mm/s)

2. Laser Marking Sprays (Cermark/Thermark)

• How It Works:

  1. Apply marking compound

  2. Laser fuses it to metal

  3. Wipe off excess

• Result: Permanent black marks

• Cost: $50-$150 per bottle (covers ~50-100 engravings)

3. Direct Oxidation Marking

• For: Stainless steel, titanium

• Technique: High heat creates oxide layer

• Appearance: Gold, blue, or black marks

• Settings: Low speed, high power (60W+ recommended)

What CO₂ Lasers CAN'T Do With Metals

❌ Cut thick metal sheets (requires fiber laser)
❌ Engrave untreated shiny metals effectively
❌ Achieve deep engraving like CNC or fiber lasers

Alternative Solutions

If you need better metal results:

1. Fiber Lasers - Ideal for bare metal engraving

2. Hybrid Approach - Use CO₂ for coating removal + fiber for deep marks

3. Chemical Etching - For complex metal parts

Pro Tips for Best Results

✔ Use air assist to prevent marking compound splatter
✔ Test settings on scrap metal first
✔ Clean surfaces thoroughly before engraving
✔ For production work, consider a fiber laser instead

Final Verdict

While CO₂ lasers can engrave treated metals, they're not the best tool for pure metal work. For occasional marking (especially anodized aluminum), they work well—but serious metal engraving requires fiber laser technology.