Laser vs Waterjet

Heat or pressure?
Speed or thickness?
Material matters.

Q: Which is faster?

Depends on thickness. Thin metal ( 15 mm): waterjet wins — can cut 150 mm steel that laser cannot reach. For high-volume production of thin-to-medium sheet metal parts, laser is standard. For thick plate work or heat-sensitive materials, waterjet dominates.

Both cut flat sheet materials to precision shapes. Laser melts/vaporizes material with focused light (fast, heat-affected zone). Waterjet erodes material with pressurized water + abrasive (no heat, any material, thicker capable). Each wins in specific scenarios.

Get a Quote DFM guide

01 · At a glance

Side-by-side summary.

Option A

Laser Cutting

Fiber or CO2 laser melts/vaporizes material. Fast, precise, clean cuts on metals and some plastics. Heat-affected zone at cut edge. Standard for sheet metal fabrication.

Option B

Waterjet Cutting

High-pressure water (up to 600 MPa) with garnet abrasive erodes material. No heat. Cuts any material — metals, stone, glass, composites. Slower than laser on thin metal, faster on thick.

02 · Detailed comparison

Feature-by-feature breakdown.

Attribute	Laser Cutting	Waterjet
Max thickness (steel)	20–25 mm (fiber laser)	150 mm+
Max thickness (aluminum)	15–20 mm (fiber laser)	150 mm+
Speed (thin metal)	Fast	Slower
Speed (thick metal)	Slow (near thickness limit)	Faster (above 15 mm)
Heat-affected zone	Yes (0.1–1 mm)	None
Material stress	Thermal stress near cut	No thermal stress
Edge quality	Clean on thin, dross on thick	Clean on all thicknesses
Precision	±0.1 mm typical	±0.2 mm typical
Material range	Metals, some plastics	Any material (metals, stone, glass, composites)
Reflective materials	Difficult (copper, brass)	Easy
Stacking multiple sheets	Limited	Yes (multiple thin sheets)
Operating cost	Moderate (consumables lower)	Higher (garnet, water)
Noise	Low	High (pumps + cutting)
Setup time	Fast	Moderate

03 · Decision guide

When to choose each.

Choose Laser Cutting when:

Sheet metal up to 15–20 mm thick
High-volume production of same parts
Fast turnaround on standard geometries
Thin cosmetic parts requiring clean edges
Non-reflective metals (steel, stainless)
Small precision features (< 5 mm)

Choose Waterjet Cutting when:

Thick materials (above 15 mm)
Heat-sensitive materials (aluminum tempered, titanium)
Non-metallic materials (stone, glass, composites)
Materials that would be heat-distorted by laser
Reflective metals (copper, brass, aluminum)
Parts requiring no heat-affected zone (aerospace, medical)

FAQ

Common questions.

Depends on thickness. Thin metal (< 6 mm): laser 3–5× faster. Medium (6–15 mm): roughly similar. Thick (> 15 mm): waterjet wins — can cut 150 mm steel that laser cannot reach. For high-volume production of thin-to-medium sheet metal parts, laser is standard. For thick plate work or heat-sensitive materials, waterjet dominates.

Depends on downstream process. For welded parts: laser HAZ is not an issue since welding adds more heat. For heat-treated aluminum (7075-T6, 6061-T6): laser cut edge locally softens, potentially problematic for high-stress edge applications. For precision machined parts cut to shape: waterjet avoids edge softening. For general sheet metal fabrication, laser HAZ is negligible and doesn't affect performance.

Stone (granite, marble, limestone), glass, ceramics, composites (carbon fiber, fiberglass), cloth and fabric, wood and plywood, thick metals (> 20 mm), reflective metals (pure copper, polished aluminum), titanium (laser is possible but heat-sensitive), food-grade materials without contamination. Waterjet's key advantage: material-agnostic cutting.

Typical pricing for sheet metal cutting services: laser $1–5 per linear meter of cut (thin material), $3–10 per linear meter (thick material). Waterjet: $2–8 per linear meter (thin), $6–20 per linear meter (thick). Laser cheaper for thin metal production. Waterjet cheaper for thick material (despite higher hourly rate, it actually cuts faster and more effectively). For specific comparison, we quote both for same part.

Laser cutting: ±0.1 mm typical, ±0.05 mm possible on optimized material. Waterjet: ±0.2 mm typical, ±0.1 mm possible with specialized machines. Both adequate for most sheet metal and flat-stock applications. For precision prototype parts needing tighter than ±0.1 mm, CNC milling from flat stock may be better than either.

Laser: varies with thickness. Thin clean cuts (Ra 0.8 µm), thick cuts may have drag lines or dross (Ra 3–6 µm). Waterjet: clean uniform edge across all thicknesses (Ra 3–6 µm standard), can produce very smooth cuts with slower head speed. Both may require deburring for cosmetic applications. For mechanical functional parts, both produce adequate finish for assembly.