**3. Used equipment, workpieces, and succession of experimental research**

Cut workpieces of HA T5K10, PSHM on the basis of CBN "borsinit" represented plates of the size 12.7 � 12.7 mm, of the thickness up to 3.5 mm, DC workpieces were two-layer composites of the size 12.7 � 12.7 mm with an upper PCD-layer of the thickness up to 1.0 mm and a hard alloy base of the thickness up to 3.0 mm.

The cuts were performed by methods of hydro-abrasive (HAC), laser (LC) cutting, laser cutting with liquid cooling (LCC), and water-jet-guided laser (WJGL).

Experiments were carried out with the use of laser blasting complex LSK-400-5, equipped with a hydro-abrasive head with water nozzle *dc* = 0.22 mm and a metering tube *Dk* = 1.05 mm.

HAC was performed with abrasive consumption up to 0.5 kg/min and under liquid pressure of 250 МPа. Garnet sand of granularity of 300 meshes was used as abrasive during cutting.

During multi-cut laser blasting, the cuts were performed with feed up to 50 mm/min. Impulse Nd:YAG laser with impulse frequency of 75–150 HZ and power of 400 W was used. For realization of the hybrid process, the unit was equipped with a special laser blasting head enabling working with the use of a ring laser nozzle and a mixing chamber to provide hydro-abrasive cutting without disturbance of the position of basic axes of the tools. The beam was focused according to a method providing centering and ingress of all its modes on the focusing lenses of the tube. Optic elements were blown with purified compressed air through a nozzle of ∅ 2.8 mm under excess pressure of 0.05 MPa. During LB the liquid was fed directly into the center of laser focus under the pressure of 25–50 MPa.

A high-temperature carbon-carbon composite weave composite was also used.
