*Article* **Abrasive Water Jet Cutting of Hardox Steels—Quality Investigation**

#### **Tibor Krenicky 1,\*, Milos Servatka 2, Stefan Gaspar 1 and Jozef Mascenik 1**


Received: 9 November 2020; Accepted: 12 December 2020; Published: 14 December 2020

**Abstract:** The paper aims to study the surface quality dependency on selected parameters of cuts made in Hardox™ by abrasive water jet (AWJ). The regression process was applied on measured data and the equations were prepared for both the *Ra* and *Rz* roughness parameters. One set of regression equations was prepared for the relationship of *Ra* and *Rz* on cutting parameters—pumping pressure, traverse speed, and abrasive mass flow rate. The second set of regression equations describes relationships between the declination angle in kerf as the independent variable and either the *Ra* or the *Rz* parameters as dependent variables. The models can be used to predict cutting variables to predict the surface quality parameters.

**Keywords:** abrasive water jet; cutting; surface quality; quality prediction
