Cutting Through the Confusion: Laser Cutting vs. Waterjet Cutting for Sheet Metal Fabrication (Updated for 2026)

Last updated on August 17th, 2026 at 08:18 am

For custom sheet metal parts, laser cutting and waterjet cutting are two very different ways to turn flat material into finished part geometry.

Laser cutting is generally the better choice for precision sheet metal parts when cutting speed, tight tolerances, small features, and production efficiency are priorities. Waterjet cutting becomes particularly useful for very thick materials, materials that are not appropriate for a fiber laser, or applications where introducing heat into the material must be avoided.

Neither process is universally better. Material type, thickness, tolerance, feature geometry, edge requirements, lead time, and sensitivity to heat all influence which cutting method makes the most sense.

While Approved Sheet Metal (ASM) specializes in laser cutting, we also have the know-how to guide you toward the best cutting method for your specific project. If waterjet cutting is the better manufacturing process, we can work with our waterjetting partner rather than forcing the part into the wrong process.

Waterjet Cutting: What It Is and When to Use It

Waterjet cutting uses a high-pressure stream of water, typically mixed with an abrasive when cutting metal, to remove material along a programmed cutting path.

Unlike laser cutting, abrasive waterjet cutting is a cold-cutting process. It does not create a heat-affected zone in the material, making it useful when heat input could affect the material or when the material is not well suited to thermal cutting.

Waterjet systems are also extremely versatile and can cut many metals as well as nonmetallic materials such as composites, plastics, stone, glass, and other materials outside the normal range of a sheet metal fiber laser.

Pros and Cons of Waterjet Cutting

Advantages of waterjet cutting:

• No heat-affected zone: The cutting process does not introduce the localized thermal effects associated with laser cutting.
• Excellent material versatility: Waterjets can process many metals and nonmetallic materials.
• Very thick material capability: Waterjet equipment can cut material substantially thicker than the practical range of many sheet metal laser systems.
• Useful for heat-sensitive applications: Material properties near the cut are not altered by a thermal cutting process.

Limitations of waterjet cutting:

• Generally slower for conventional sheet metal: Abrasive waterjet cutting usually requires more cutting time than fiber laser cutting on typical sheet metal parts.
• Wider kerf: The cutting stream typically removes a wider path of material than a fiber laser.
• Fine-feature limitations: Very small holes, narrow sections, or closely spaced intricate features may be better suited to laser cutting.
• Edge characteristics: Cut quality, striations, and taper depend on material thickness, cutting speed, equipment, and process settings.

Laser Cutting: What It Is and When to Use It

Fiber laser cutting uses a highly focused laser beam to melt or vaporize material along a programmed cutting path. Assist gas removes the molten material from the kerf, creating a narrow and precise cut.

For typical precision sheet metal fabrication, fiber laser cutting combines high cutting speed with excellent accuracy, repeatability, and feature detail. This makes it especially effective for custom brackets, panels, chassis, enclosures, weldments, and other parts containing numerous holes, slots, contours, and cut features.

Pros and Cons of Laser Cutting

Advantages of fiber laser cutting:

• High cutting speed: Fiber lasers are particularly efficient when processing common sheet metal materials and thicknesses.
• Narrow kerf and precise features: The focused beam allows intricate geometry, small features, and tight feature-to-feature positioning.
• Excellent repeatability: Programmed geometry can be reproduced consistently across prototype and production quantities.
• Part marking: The laser can also etch or mark metals for complex designs, identification, bend locations, assembly instructions, or other manufacturing information.
• Efficient production: Fast piercing and cutting make fiber lasers highly productive for parts containing many individual features.

Limitations of fiber laser cutting:

• Material thickness limits: Every laser system has a practical cutting range based on its power, material, and application.
• Heat input: Laser cutting creates a localized heat-affected zone, which may need consideration on certain materials or especially heat-sensitive geometries.
• Material limitations: Some nonmetallic or specialized materials are better suited to other cutting processes.

Laser Cutting vs. Waterjet Cutting: Quick Comparison

Laser or Waterjet: 4 Top Considerations

For some sheet metal projects, the choice between laser cutting and waterjet cutting becomes fairly clear once the material, thickness, geometry, and tolerance requirements are understood.

1. Material Thickness

At Approved Sheet Metal, our in-house laser cutting capabilities cover metals up to 0.375” (⅜”) thick. That is an ASM capability, not a universal thickness limit for every fiber laser system.

Waterjet equipment can process substantially thicker materials, making it useful when material thickness falls outside the practical range of the available laser.

Thickness alone does not determine which process is best. Material type, feature size, edge requirements, tolerances, quantity, and subsequent manufacturing operations also need to be considered.

2. Heat-Affected Zone

A heat-affected zone, or HAZ, is the area next to a thermal cut where heat from the process can affect the material.

Waterjet cutting is a cold process and does not create a heat-affected zone. This can be an important advantage when the material or application specifically requires a nonthermal cutting process.

Laser cutting does generate localized heat, but that does not mean heat is automatically a problem for precision sheet metal parts. Modern laser cutting concentrates energy in a very small cutting area, and proper programming helps manage heat input.

Heat becomes a greater design consideration when parts contain dense perforation patterns, closely spaced features, narrow sections, or other geometry where a large amount of cutting energy is concentrated into a small area.

In some cases, our sheet metal shop can mitigate those issues with our laser’s water assist feature. Another solution is to combine laser cutting with a punch tool, allowing ASM to use the most appropriate process for different features on the same part.

3. Accuracy, Kerf, and Feature Detail

For typical precision sheet metal work, fiber laser cutting provides an excellent combination of narrow kerf, accuracy, and fine-feature capability.

ASM’s laser cutting equipment can hold cutting tolerances down to approximately +/- 0.002” under appropriate conditions, making laser cutting well suited for precision sheet metal parts with tighter tolerances.

Waterjet cutting can also produce highly accurate parts. Its achievable tolerance depends heavily on the specific machine, cutting head, material, thickness, cutting speed, and quality settings. Modern waterjet systems can compensate for effects such as kerf taper, so it is not accurate to assign one universal tolerance to every waterjet-cut part.

The practical distinction for many sheet metal applications is that the narrower laser kerf and high cutting speed make fiber laser cutting particularly effective for small holes, narrow slots, intricate contours, and parts containing large numbers of closely located features.

4. Speed

For typical sheet metal materials and thicknesses, fiber laser cutting is generally substantially faster than abrasive waterjet cutting.

The exact cutting speed varies according to material, thickness, equipment, geometry, assist gas, and machine power, so broad inches-per-minute comparisons can be misleading.

What matters to the customer is how cutting speed affects production. Faster piercing and cutting can reduce machine time and make fiber laser cutting particularly efficient for prototypes and low-volume production containing many holes, slots, contours, or repeated parts.

How Does Cutting Method Affect Part Cost?

There is no universal rule that says waterjet cutting is cheaper than laser cutting or vice versa.

The cost of either process depends on the part, material, thickness, machine time, required edge condition, quantity, secondary operations, and other manufacturing requirements.

Where Laser Cutting Can Reduce Cost

• Fast cutting and piercing reduce machine time on conventional sheet metal.
• Efficient nesting helps maximize the number of parts produced from each sheet.
• Narrow kerf allows parts and features to be positioned efficiently.
• Precise cutting can reduce secondary operations for many sheet metal applications.
• High productivity makes laser cutting efficient for parts with many holes, slots, and contours.

Where Waterjet Cutting Can Make More Sense

• The material is too thick for the available laser cutting system.
• The material cannot tolerate a thermal cutting process.
• The project involves a material that is not appropriate for the fiber laser.
• A waterjet can produce the required geometry without moving the part to another more expensive manufacturing process.

For conventional precision sheet metal, fiber laser cutting is often highly economical because of its speed and productivity. For very thick, specialized, or heat-sensitive materials, waterjet cutting may be the more practical manufacturing solution.

Design Considerations for Laser-Cut Sheet Metal Parts

When a part is well suited to fiber laser cutting, several design decisions can further improve manufacturability, cost, and lead time.

Small Holes and Narrow Features

Very small holes, narrow slots, thin sections, and intricate details should be considered relative to the material type and thickness. Just because geometry can be drawn in CAD does not necessarily mean it is the best geometry to cut into every thickness of sheet metal.

Closely Spaced Features and Perforations

Dense patterns of holes or closely spaced cut features concentrate more laser cutting into a small area. On certain parts, the cutting sequence, feature spacing, or manufacturing method may need to be adjusted to control heat and distortion.

Kerf Compensation

Kerf is the width of material removed during cutting. Engineers generally do not need to manually compensate their CAD geometry for our laser kerf. The cutting path and kerf compensation are handled during manufacturing programming so that the finished feature matches the required dimensions.

Material Utilization and Nesting

Efficient nesting can reduce material waste and part cost by arranging parts effectively on the available sheet. This is typically handled by the fabricator during programming rather than requiring the customer to manually nest production parts.

Tab-and-Slot Designs for Easier Assembly

Laser cutting is particularly useful for creating precise interlocking tabs, slots, locating features, and other geometry that helps components self-locate during assembly.

Well-designed tab-and-slot features can simplify fixturing, improve alignment, and reduce assembly time. Depending on the application, they can also reduce the number of separate fasteners or fixtures required.

The Right Cutting Technology for Your Application

In comparing laser cutting and waterjet cutting, there’s no overall winner. The best process is the one that meets the material, geometry, tolerance, cost, and lead-time requirements of the specific part.

Choose Fiber Laser Cutting When:

• You are manufacturing conventional precision sheet metal parts
• Tight tolerances or small features are important
• Cutting speed and lead time are priorities
• The design contains numerous holes, slots, contours, or repeated features
• You need etched or marked features
• You are producing prototypes or low-volume production parts efficiently

Consider Waterjet Cutting When:

• The material is too thick for the available laser cutting equipment
• The material or application specifically requires a cold-cutting process
• You are cutting materials that are not appropriate for a fiber laser
• A heat-affected zone is specifically prohibited by the application

ASM’s sheet metal shop provides fiber laser cutting in-house, or we can call on our waterjetting partner when waterjet cutting is the better process. Our goal is not to force every project onto the same machine. It is to identify the manufacturing approach that makes the most sense for your part.

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