Importance

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Abstract

The number of cycles R of a fundamental frequency F (Hz) for a set value Tw (ms) of a set weld time [WELD] is first found as a real number. The number of cycles R conforms to the number of times (real number) of repetition of the fundamental frequency F cycle in the interval of the set weld time Tw and is given as Tw.times.F (step B.sub.1). An AC waveform cycle set value Ns (integer) for the set weld time Tw is then determined as an integer Min [N] that is equal to the number of cycles R or to the least one (i.e., the integer closest to R) of larger integers (N) than R (step B.sub.2). An AC waveform cycle set frequency Fs (Hz) and a period Ts (ms) for the set weld time Tw is then found from the set number of cycles Ns. The set frequency Fs and the period Ts are given as Fs=1/Ts and Ts=Tw/Ns, respectively (step B.sub.3). The thus obtained values (data) of the set frequency Fs and set number of cycles Ns are stored in the memory at predetermined storage positions thereof and are indicated on a setting screen (step B.sub.4).

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