Technologies
Waterjet cutting is a cold-cutting process that uses water pressurized to 30,000–90,000 PSI combined with abrasive garnet particles to cut through metal, stone, glass, composites, and other hard mater
Waterjet cutting is a cold-cutting process that uses water pressurized to 30,000–90,000 PSI combined with abrasive garnet particles to cut through metal, stone, glass, composites, and other hard materials with dimensional tolerances of ±0.1mm to ±0.25mm. Unlike laser or plasma cutting, waterjet prod
Waterjet cutting is a cold-cutting process that uses water pressurized to 30,000–90,000 PSI combined with abrasive garnet particles to cut through metal, stone, glass, composites, and other hard materials with dimensional tolerances of ±0.1mm to ±0.25mm. Unlike laser or plasma cutting, waterjet produces zero heat-affected zone (HAZ), making it ideal for heat-sensitive alloys and pre-hardened materials. The technology is widely used across manufacturing sectors in Egypt, Saudi Arabia, and globally for precision sheet metal fabrication and structural components.
Waterjet cutting follows a straightforward mechanical process that separates it from thermal cutting methods:
High-pressure pump pressurization — Water is drawn from a reservoir and forced through a plunger pump to 30,000–90,000 PSI (210–620 MPa), depending on the material thickness and required cutting speed.
Pressure accumulator stabilization — Pressurized water is stored in an accumulator tank to maintain consistent pressure and prevent pulsing, ensuring clean, smooth cuts.
Focusing nozzle and orifice — Water exits through a small orifice (typically 0.254mm–0.381mm diameter) in a focusing nozzle, creating a narrow, coherent jet with extreme velocity.
Abrasive injection — For hard materials, garnet abrasive (typically 80 mesh grade per GMA standards) is metered and mixed into the water jet inside a mixing tube just before the cutting nozzle.
Abrasive-water jet acceleration — The mixed jet reaches velocities exceeding 300 meters per second as it exits the cutting head.
Material cutting and kerf formation — The jet impacts the workpiece, eroding material along the cut path. The kerf width is typically 0.8mm–1.5mm depending on nozzle diameter and abrasive flow rate.
CNC-controlled motion — A multi-axis CNC table moves the part (or cutting head) to follow the programmed geometry, producing dimensionally accurate cuts with near-vertical edges on thin materials and slight taper on thick sections.
Waterjet cutting handles virtually any material without thermal degradation. Carbon steel, stainless steel, aluminum, and titanium are standard production materials. Hardened tool steel and pre-tempered alloys are excellent candidates because waterjet produces no heat-affected zone—a critical advantage over laser cutting, which can anneal or warp such materials. Beyond metals, waterjet efficiently cuts stone (marble, granite), glass, composites, rubber, and plastics. Unlike laser cutting, reflectivity is irrelevant; copper and brass—common in electrical and mechanical assemblies across Jeddah and Riyadh—cut cleanly with waterjet. Learn more about sheet metal fabrication materials to understand material selection for your project.
| Parameter | Waterjet Cutting | Laser Cutting | Plasma Cutting |
|---|---|---|---|
| Max material thickness | 200mm+ (steel) | ~25mm (steel) | ~50mm (steel) |
| Tolerance | ±0.1–0.25mm | ±0.05–0.1mm | ±0.5–1.0mm |
| Heat-Affected Zone (HAZ) | None | Yes (narrow) | Yes (significant) |
| Materials | Metal, stone, glass, composites, rubber | Metal, wood, acrylic | Conductive metals only |
| Operating cost | Medium–High | Medium | Low |
| Best for | Thick/sensitive materials, mixed materials | Thin sheet metal, high precision | Thick structural steel, rough cuts |
Engineers comparing laser cutting services in Egypt with waterjet cutting should prioritize waterjet for parts exceeding 6mm thickness, heat-sensitive materials, or mixed-material stacks. Laser cutting delivers tighter tolerances (±0.05mm) on thin sheet but cannot match waterjet's material range. Plasma cutting is lowest cost but tolerances exceed ±0.5mm—unsuitable for precision work. At Entag, we select the cutting process based on your material, thickness, tolerance requirement, and production volume to optimize cost and lead time.
Waterjet achieves ±0.1mm to ±0.25mm dimensional tolerance depending on material thickness, jet pressure, and cutting speed. Thinner materials and slower feed rates yield tighter tolerance stacks. The kerf width of 0.8mm–1.5mm must be accounted for in part geometry—your CAD file should reference finished dimensions, and Entag's engineers apply kerf compensation during nesting. Minimum hole diameter should be at least 1.5× material thickness to prevent jet deflection. On cuts thicker than 50mm, expect slight edge taper (typically 1–3 degrees) due to jet deceleration through the part thickness. Review DFM design guidelines to optimize your part for waterjet cutting and reduce rejection risk.
What is the difference between pure waterjet and abrasive waterjet cutting?
Pure waterjet uses only pressurized water (30,000–90,000 PSI) and cuts soft materials like rubber, foam, and food products. Abrasive waterjet adds garnet abrasive (80 mesh) to cut hard materials: steel, aluminum, glass, stone, and composites. Abrasive waterjet is mandatory for industrial metal fabrication.
What materials can waterjet cutting cut?
Waterjet cuts carbon steel, stainless steel, aluminum, titanium, hardened tool steel, copper, brass, glass, marble, granite, rubber, composites, and plastics. Unlike laser cutting, material reflectivity is irrelevant—making waterjet ideal for copper and reflective alloys commonly used in industrial applications across Egypt and Saudi Arabia.
Is waterjet cutting accurate enough for precision engineering parts?
Yes. Abrasive waterjet achieves ±0.1mm to ±0.25mm tolerances depending on material thickness and feed rate. For applications requiring ±0.05mm or tighter, post-waterjet CNC milling or EDM finishing is recommended for secondary operations.
Does waterjet cutting create a heat-affected zone (HAZ)?
No. Waterjet is a cold-cutting process—it generates zero heat at the cut zone, producing zero heat-affected zone. This is critical for hardened steels, titanium, composites, and pre-tempered alloys where laser or plasma cutting would degrade material properties.
How thick can waterjet cutting cut?
Abrasive waterjet cuts steel up to 200mm thick and aluminum up to 250mm thick, though cut quality and speed decrease at extreme thicknesses. Production-quality work in Egypt and Saudi Arabia typically falls within 3mm–80mm, balancing speed, tolerance, and cost.
How much does waterjet cutting cost in Egypt?
Cost depends on material, thickness, cut length, and geometry complexity. Waterjet is more expensive per meter than laser cutting on thin sheet but more cost-effective than laser for thick or mixed materials. Entag provides transparent quotes within 24 hours—upload your DXF or DWG file to request a quote.
Ready to start your project? Request a quote on Entag — upload your CAD file and get a price in 24 hours. Entag serves engineers and procurement teams in Cairo, Alexandria, Jeddah, Riyadh, and Dammam with on-demand waterjet cutting, laser cutting, and complete sheet metal fabrication services. No minimum order. No setup fees.
