Waterjet or Laser? How to Choose the Right Cutting Method
Laser and waterjet cutting are not direct substitutes for one another in every application. The more cost-effective solution depends on the material, thickness, heat affect zone, cut quality, mix of parts, and required flexibility.
Short Answer
For thin, easily laser-cuttable sheets and high production volumes, laser cutting is often very productive. Waterjet cutting becomes particularly attractive when different materials, thicker material gauges, delicate materials, or a cutting process without a heat-affected zone are required. In mixed-production environments, therefore, it is often not the maximum cutting speed that is the deciding factor, but rather the overall flexibility of the process.
| Criterion | Water jet | Laser |
| Thermal Effect | not a traditional thermal cutting process | thermal process |
| Material diversity | very wide | depending on the material |
| Thick Materials | wide range of applications | depending on the material and laser power |
| Thin sheet metal / high volume | depending on the application | often very productive |
| Tool Change | not a traditional cutting tool | not a traditional cutting tool |
| Post-processing | often minimal thermal rework | can create a heat-affected zone depending on the application |
When is a laser the best choice?
For thin- to medium-gauge sheet metal, metals that are well-suited for laser cutting, high repeat rates, and large production runs, the laser’s high cutting speed can be a significant advantage. Those who work almost exclusively with a narrowly defined range of materials can optimize the process accordingly.
When does waterjet cutting become particularly interesting?
- When very different materials are to be machined on the same machine.
- When thicker materials are part of your regular range of applications.
- When it is necessary to avoid thermal effects on the microstructure, hardness, coating, or component edges.
- When metals, plastics, composites, stone, or glass are used in the same manufacturing process.
- When chamfers, weld preparation, or 5-axis geometries are required.
- When small production runs and varying orders require a high degree of process flexibility.
Compare the component, not the machine
A meaningful comparison of processes should be conducted using specific components. In addition to cutting time alone, factors such as material utilization, setup time, post-processing, quality requirements, and capacity utilization should be taken into account. For one component, the laser may clearly be more cost-effective, while for another, the waterjet may be the better choice. For contract manufacturers handling a mix of orders, it therefore makes sense to classify parts.
Example: Aluminum
For aluminum, the assessment varies significantly depending on material thickness, alloy, quality requirements, and production volume. Thin sheets produced in high-volume runs may be ideally suited for laser cutting. As thickness increases, or when thermal effects need to be avoided, waterjet cutting becomes a more attractive option. It is unreliable to specify a blanket thickness limit, as machine performance, the nozzle, the quality level, and the geometry all play a decisive role.
Example: Stainless steel and welded assemblies
When it comes to stainless steel, downstream processes are often just as important as cutting time and contour quality. If a specific bevel is required for a weld, 5-axis waterjet cutting can combine cutting and beveling into a single process. This can change the economic assessment compared to a purely 2D cut.
How to Make the Decision
- Group typical components by material, thickness, dimensions, and annual volume.
- Specify the required cut quality and the permissible thermal impact.
- Compare cutting time and non-cutting time for each process.
- Take post-processing and material utilization into account.
- Include the investment and expected annual capacity utilization in the calculation.
- Perform a test cut on critical parts.
Would you like to know how your reference part can be manufactured using waterjet cutting? Send us the drawing, material type, and material thickness. We’ll review the application and, upon request, determine actual cutting parameters.