Method and device for controlling the electric current density a

Details Method and device for controlling the electric current density a Method and device for controlling the electric current density a

1996-06-13

1998-02-10

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912157, 21912159, 21912152, B23K 1000

Patent

active

057171866

ABSTRACT:
In a method for controlling the electric current density across a workpiece in a furnace during heat treatment in a plasma an auxiliary electrode with a known surface area is introduced into the furnace. A batch of workpieces is then introduced into the furnace. First a plasma of a neutral gas is generated within the furnace. The total current within the furnace and the current within the auxiliary electrode are measured. The surface area of the workpieces is calculated according to the equation ##EQU1## The auxiliary electrode is then switched off and a material-transmitting plasma is generated. The nominal total electric current for controlling a desired nominal current density is then calculated according to the equation

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