Water jetting is an advanced processing and cleaning technology that uses high-pressure fluid as a carrier, accelerating water flow to extremely high speeds through special nozzles to form a high-energy jet.Essentially, it utilizes the low compressibility and easily concentrated kinetic energy of water to transform ordinary liquids into jets with powerful impact and precise controllability under specific pressure, thereby cutting, peeling, drilling, or surface cleaning materials. This technology, due to its advantages such as cold processing, no heat-affected zone, and environmental friendliness, has been widely used in industrial manufacturing, stone processing, aerospace, ship repair, and municipal engineering.
The formation of a water jet depends on the synergistic effect of a high-pressure generation system and a precision nozzle. A high-pressure pump pressurizes water to hundreds of megapascals or even higher, delivering it to the nozzle via an energy storage device and pipelines. Within a very small throttling orifice, the flow velocity jumps, forming a jet with a tiny diameter and speeds several times the speed of sound. Pure water jets are suitable for cutting and cleaning soft or heat-sensitive materials, such as water-soluble paper, food, rubber, and thin-walled plastics. Abrasive water jets, formed by mixing abrasive particles (such as garnet and corundum) into water, can efficiently process hard materials such as metals, stone, ceramics, and composite materials due to the synergistic effect of particle impact and cutting, significantly broadening their application range.
From a mechanism perspective, the material removal process of water jets combines hydraulic impact with micro-cutting effects. When high-speed water flow or abrasive jets impact the workpiece surface, they instantly generate enormous dynamic pressure and shear force, causing plastic deformation, crack propagation, and even localized breakage and peeling of the material. Since the entire process uses water as the medium, there is no high-temperature heat input, avoiding problems such as changes in metallographic structure, thermal stress cracks, or edge melting that may occur with traditional thermal cutting. This makes it particularly suitable for heat-sensitive or easily deformable workpieces. Furthermore, water jets can be precisely controlled by a CNC system to control the jet path, pressure, and flow rate, achieving high-precision machining of complex contours. The kerf width and surface roughness can be adjusted within a certain range to meet different process requirements.
The core advantages of waterjet technology lie in its cold processing, flexibility, environmental friendliness, and versatility. Cold processing eliminates the risk of heat-affected zones; flexibility is reflected in its adaptability to various materials and shapes through parameter adjustments; environmental friendliness stems from the recyclability of water and the absence of harmful fumes and gases; and versatility is demonstrated by the ability to switch between various tasks such as cutting, cleaning, rust removal, and coating removal simply by changing the nozzles and parameters within the same system.
In summary, waterjet technology is an advanced processing and cleaning method that uses high-pressure, high-speed fluid as its core, integrating mechanics, materials science, and automatic control. Its concept of "using water instead of blades and jetting instead of cutting" is providing a highly efficient, precise, and green technological path for modern manufacturing and maintenance engineering.
