| 摘要 |
PURPOSE:To control uniformly always the width of back bead by impressing the electrical signal of the frequency, voltage and current characteristics different from those of the welding power source between base metal and metallic plate in case of performing one side welding of welding base metal using backing metallic plate and flux. CONSTITUTION:The electrical signal of the different frequency, voltage and current characteristics from those of welding power source is impressed from the frequency oscillator 12 having the constant current characteristic of 200Hz between the base metal 1 and metallic plate 3 in case of performing one side welding of the base metal 1 by electrodes 4A, 4B by putting backing copper plate 3 via the inorganic member 2 of flux, etc. to the welding base metal 1. The voltage between the base metal 1 and metallic plate 3 is detected by voltage detector 6 during the welding work, the signal of 200Hz is passed through by band pass filter 13 and converted into DC signal by convertor 7. A control is performed so as to coincide at all times the voltage signal between the base metal 1 and backing copper plate 3 with the reference voltage signal 10 by removing noises with filter 8, by comparing with the preset reference voltage 10 according to the prescribed back bead width with comparator 9 and by outputting the deviated signal of both signals to welding power source 5A via integrator 11.
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