FIELD: welding processes and equipment, possibly controlling welding current in contact welding AC machines due to initially setting in control unit calculated angle of thyristor ignition.
SUBSTANCE: before starting welding process at short circuited electrodes in order to determine parameters of welding circuit such as active and inductive resistance values welding transformer is turned on at predetermined angles of thyristor ignition. Acting value of secondary current of welding circuit is measured for predetermined angle values and depending upon measured value graphs of functions Xk = f(Rk) (1,2,3,4) are plotted. Coordinates of crossing point of said graphs corresponding to values Rk and Xk of welding circuit are determined. At welding ignition angle of thyristors is changed in such a way that to make mean value calculated at taking into account Rk and Xk for welding cycle corresponding to preset one.
EFFECT: simplified process for determining phase control parameters at program control of thyristor ignition angle.
1 dwg, 1 ex
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