Laser, waterjet, plasma: three cutting processes, three different logics. Pick the wrong one and you either overpay or miss the tolerance. Here is how to decide.
The three processes in one sentence
- Laser: a focused beam melts and vaporizes the metal. Fast, precise, clean.
- Waterjet: an ultra-high-pressure water stream loaded with abrasive erodes the material. Cold, universal, no thermal distortion.
- Plasma: an electric arc ionizes a gas that melts the metal. Rugged, economical on thick plate.
Head-to-head comparison
| Criterion | Laser | Waterjet | Plasma |
|---|---|---|---|
| Precision | ±0.05 mm | ±0.1 mm | ±0.5 mm |
| Steel thickness | 0.5 to 25 mm | up to 200 mm | 1 to 80 mm |
| Edge quality | Excellent | Very good | Average (needs rework) |
| Heat-affected zone | Small | None | Significant |
| Speed (thin sheet) | Very fast | Slow | Fast |
| Hourly cost | High | High | Moderate |
| Non-metal materials | Limited | Anything (glass, stone, composite) | No |
When to choose laser
Laser is the default choice for thin sheet metal work. It excels from 0.5 to 8 mm on steel, stainless and aluminum. Precision is there, edges are clean and usually need no rework, and speed is unbeatable on thin gauge.
If your part is under 8 mm thick and needs good precision, laser is almost always the right call.
Its limits: beyond 20-25 mm it becomes slow and expensive, and it struggles with thick reflective materials.
When to choose waterjet
Waterjet has one advantage the others lack: it does not heat the material. No heat-affected zone, so no change to the metal structure, no distortion. That is decisive for parts with high metallurgical requirements, thick plate, or heat-sensitive materials.
It also cuts almost anything: metal, glass, stone, composite, gasket. The trade-off: it is slow and its hourly cost is high. Reserve it for cases where laser cannot deliver.
When to choose plasma
Plasma is the economical process for thick steel, typically 10 to 80 mm, when fine precision is not critical. Structural work, frames, thick mounting plates: that is its home turf.
Its weakness: a significant heat-affected zone and an edge that often needs rework. For precision sheet metal, it is not the right tool.
The decision table
| Your need | Recommended process |
|---|---|
| Thin sheet (< 8 mm), precision, volume | Laser |
| Thick plate, no thermal distortion | Waterjet |
| Thick steel, tight budget | Plasma |
| Non-metal material | Waterjet |
| Perfect edge, no rework | Laser or waterjet |
What DRAWLESS takes into account
When you describe a part in DRAWLESS, the generated DXF cutting file works on all three processes. But constraints differ: a hole too small relative to thickness will run on waterjet but not on plasma. DRAWLESS adapts the geometry to shop-floor rules so your file is genuinely cuttable.
Describe your part, get a clean DXF ready for the shop — whatever the cutting process.