Abstract: A method of control of chemico-thermal treatment of workpieces in a glow discharge comprising the steps of measuring the workpiece temperature, its rate of change and frequency of arc occurrence, comparing the measured quantities with their predetermined values, producing the corresponding error signals, and obtaining a control signal from the latter to control the glow discharge voltage.A device for carrying out the method of the invention comprising a temperature sensor, a rate-of-change-of-temperature sensor, and an arc occurrence frequency sensor having their outputs connected to comparison elements adapted to compare said measured quantities with their predetermined values, and having their inputs connected to the workpieces and to leads of a discharge chamber. The comparison elements have their outputs coupled to the inputs of regulators of the temperature, its rate of change and frequency of arc occurrence, said regulators being coupled to a supply voltage source via a control unit.

Abstract: A method of controlling a movable energy source includes controlling the velocity and the power of the energy source moved along the predetermined path in accordance with a difference between the predetermined and the measured temperature at different areas of the surface. A signal to control the movement of the energy source is provided when the path of the source is approximated by a broken line represented by the piecewise linear function or arcs of circles of different radii. The power of the source is varied in proportion to the average deviation of the measured temperature from the predetermined one for each area of the surface. The velocity of the source is controlled using the signals representative of the difference between the predetermined and the measured temperature.