In this work was investigated the formation of an electric are. The cutting
of metal detail was carried out in fluid by the rotaried disk. As a result
were determined the modes of polar effect for a material melting and value
of a current density in an anode spot of all electric are. It was made for
the range of currents I=500-5000A. The calculation procedure of an expandi
ng plasma cavity in water was developed. The basic parameters of plasma in
the presence of material evaporation were determined. The geometrical sizes
of expanding gas cavity, and also cavity pressure depending on parameters
of electrical are discharge were determined.
Regarding operating variables of installation were made the recommendations
which based on conditions of an electric are initiation and duration of an
are burning. It allows to ensure heightened productivity and efficiency of
installation, and also to determine the main regularities of electrophysic
al and electro-hydrodynamical processes which influencing to the service pr
operties of equipment.