Apparatus and method for controlling the electric power in the mash seam wealding

摘要

The invention being welding power during mash for via the thyristor from a power supply to compensate for the classification minutes of the welding current from being welding apparatus during mash welding the overlapped blood welding member by a welding current supplied to the circular electrode of the pair the control device is a welding voltage detection means and the detection means of welding current and the total resistance value calculation means and a total resistance value change amount calculating means and a total resistance value storing means, a thyristor trigger phase angle calculation means, trigger phase angle storage means constructed and the total resistance value calculation means in calculating the total resistance value by _{R n = V n / I n} (1) , and wherein the total resistance value change amount calculating means DELTA _{R = R n + 1 - R} n (2 ) in n + 1 by a step of total resistance value of the n wherein calculating the difference between the total resistance value of the step, and the thyristor trigger phase angle calculating means θ _{n + 1} = θ _n + k △ R (3) the phase angle by therefore it characterized in that for calculating the amount of change Has the effect that can be prevented, the welding varies the strength of the welded portion in a direction proceeding.