Investigation on Welding Arc Sound (Report III) : Effects of Current Waveforms on TIG Welding Arc Sound(Welding Physics, Processes & Instruments)

概要

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Investigation has been made on the effects of the rectangular, sawtooth, triangular and sine current waveforms on the welding arc sound of TIG arc, that is a stationary arc on the water cooled copper plate, by means of a transitor control type power source. The experimental results have indicated that the welding arc sound depends on the current waveform, pulse frequency f_p and pulse amplitude T_p. The welding arc sound is composed of a fundamental tone which has a frequency spectrum of f_p and its harmonics. An excellent frequency spectrum f_<EX> agrees with f_p in the triangular and sine wave current, but f_<EX> changes to higher harmonic in the rectangular and sawtooth wave current. The effective sound pressure P_e is shown as a function of f_p and T_p (P_e∝<f_p>^m・<T_p>^n), and the useful equations which are possible to estimate the noise level have been obtained.
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