Moscow State University of Civil Engineering, Moscow, Russia
Yu. I. Karlina, Cand. Eng., Researcher, e-mail: jul.karlina@gmail.com

Irkutsk National Research Technical University, Irkutsk, Russia
E. A. Guseva, Cand. Eng., Associate Prof., Dept. of Materials Science, Welding and Additive Technologies, e-mail: el.guseva@rambler.ru
M. V. Konstantinova, Cand. Eng., Associate Prof., Dept. of Materials Science, Welding and Additive Technologies, e-mail: mavikonst@mail.ru

Angarsk State Technical University, Angarsk, Russia
V. E. Gozbenko, Dr. Eng., Prof., Dept. of Arrangement of Transportation and Automobile Transport Management, e-mail: vgozbenko@yandex.ru

Abrasive water jet technology (AWJ) is widely used in the manufacturing industry for cutting materials when other methods are not applicable. It is known that the abrasive is embedded both on the cutting surface and on the surface perpendicular to the cutting edge, where (due to the divergence of the jet) the jet hit but did not cut through. Such sand backfilling is a known disadvantage of the process. In this regard, studies were conducted and the quality of cutting and embedding of abrasive after water jet cutting of plates made of 12Kh18N10T corrosion-resistant steel and VT-20, VT-6 titanium alloys was assessed. The cut was studied to establish the presence or absence of abrasive embedded under the surface, as well as the upper surface of the plate near the cut, where particles outside the main core of the jet could have gotten. The penetration levels, waviness and roughness of the surface, as well as the interaction mechanisms of the abrasive with the surface were assessed using a combination of scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and profilometry. It was found that, despite the differences in the characteristics of the abrasive, no significant differences were observed in the quality of cutting or penetration of the abrasive into the metal. It was shown that upon impact, individual particles are subjected to forces that are orders of magnitude greater than their crushing load. It is noted that most of the abrasive particles are destroyed during water jet machining; any differences in the original morphology of the abrasive particles will not dominate the behavior, since it is the morphology of fragments of these destroyed particles that controls the penetration into the metal surface and the quality of the cut.

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