Laser Cleaning Parameter Guide: Metal, Stone & Composites – All in One

Laser cleaning offers a non-contact, abrasive-free, chemical-free process with controlled heat input, making it the mainstream solution for industrial surface treatment.

To achieve efficient cleaning while keeping the substrate safe, seven parameters must be precisely matched to the material's characteristics: power, wavelength, pulse width, frequency, scanning speed, spot size / defocus, and overlap rate.

This article provides systematic parameter tuning logic and practical ranges for common substrates – metals, stone, plastics, composites – balancing efficiency with non-destructive cleaning.

I. Metal Cleaning (1064 nm, fiber laser)

1. Carbon Steel / Cast Iron / Structural Steel

Applications
Rust removal, oxide scale removal, old paint stripping, pre-weld cleaning

Recommended Parameters

• Power: 200–1000 W

• Pulse width: 50–100 ns

• Frequency: 20–50 kHz

• Speed: 200–500 mm/s

• Fluence: 5–15 J/cm²

• Overlap rate: 50%–60%

Tuning Tips

• For thick rust or heavy coatings → increase power, reduce frequency, lower speed.

• For thin parts → use lower power + positive defocus to prevent burn and distortion.

2. Stainless Steel

Applications
Weld seam cleaning, oxide layer removal, oil / fingerprint removal

Recommended Parameters

• Power: 100–500 W

• Pulse width: 20–50 ns

• Frequency: 30–80 kHz

• Speed: 300–800 mm/s

• Fluence: 3–8 J/cm²

Tuning Tips

• Prefer shorter pulse width to reduce heat-induced discoloration.

• For mirror-finish or precision parts → low power, high frequency, high speed to avoid intergranular corrosion and color difference.

3. Aluminum / Magnesium Alloys (Highly Reflective / Heat-sensitive)

Applications
Oil removal, coating removal, pre-treatment for anodizing

Recommended Parameters

• Power: 100–300 W

• Pulse width: 10–50 ns

• Frequency: 50–100 kHz

• Speed: 400–1000 mm/s

• Defocus: +2 to +5 mm

Tuning Tips

• Strictly limit fluence to avoid burning and deformation.

• For highly reflective materials → avoid tight focus; use a homogenized large spot.

• For thin parts (≤0.5 mm) → always test with low power and low speed.

4. Copper / Brass / Titanium Alloys

Copper and Brass

• Power: 150–400 W

• High frequency, short pulse width → prevent oxidation and discoloration.

Titanium Alloys

• Power: 100–300 W

• Pulse width: <1 ns (picosecond or femtosecond) for precise oxide film removal while preserving surface integrity.

II. Stone / Concrete / Ceramic Cleaning

1. Marble / Limestone (Soft and Porous)

Applications
Yellowing removal, mold removal, oil stain removal, cultural heritage restoration

Recommended Parameters

• Wavelength: 1064 nm or UV

• Power: 50–200 W

• Frequency: 50–100 kHz

• Speed: 150–300 mm/s

Tuning Tips

• Use low fluence, high frequency, high speed.

• Never dwell with high power → avoid edge chipping, blackening, and grain boundary damage.

2. Granite / Quartzite (Hard and Dense)

Applications
Inorganic stain removal, adhesive removal, paint / coating removal

Recommended Parameters

• Wavelength: 1064 nm

• Power: 100–300 W

• Frequency: 30–60 kHz

• Speed: 200–400 mm/s

• Fluence: 5–8 J/cm²

Tuning Tips

• Organic contamination → can be assisted by UV photochemical decomposition.

• For porous surfaces → reduce overlap rate and use multiple light passes to avoid heat buildup.

3. Ceramics and Glass

Precision Ceramics

• Use UV or picosecond laser (short pulse width) → prevent cracking.

Glass

• Low fluence + high frequency + high speed → avoid thermal fracture and coating delamination.

III. Composites / Wood / Artifact Cleaning

1. Carbon Fiber and Fiberglass Composites

Recommended Parameters

• Low power: 50–150 W

• Short pulse width

• High frequency, high speed

• Positive defocus

Tuning Tips

• Prevent resin burning and fiber exposure.

• Mainly for adhesive / coating removal → strictly limit single-pass energy.

2. Wood and Paper Artifacts

Recommended Parameters

• UV or CO₂ laser

• Low power, ultra-high speed scanning

• Multiple light passes, very low fluence per pass

Tuning Tips

• Zero carbonization, zero ablation.

• Always validate on a hidden area first.