On the Stabilizing Method of the Voltages by "Balast Lamp", Useful in the Measurement of the Eccentricity of the Covered Welding Electrode in the Process of the Automatic Covering
1952 Volume 21 Issue 2 Pages 39-42
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1952 Volume 21 Issue 2 Pages 39-42
Previously the authors proposed a method for electrically measuring the eccentricity of the covered electrode and the paper on this subject was already published in the journal issued by the Association of the Welding Research.
It is most delightful to the authors that the proposed method has won a wide reputation, being in use now at many plants throughout Japan.
To say the truth, however, the previous method was applicable only for checking whether the produced welding electrode was good or not, but not as the process of their production; so that it could not help in positively reducing the eccentricity. Recently there have been increasing demands for the improvement of the covered welding electrodes, especially for the diminishing of their eccentricity, which not only affects the weld through the instability of the arc, but also is the only factor by which to determine quantitatively the electrode quality. These demands have been urging the manufacturers to install the instrument proposed by the authors' method on the automatic electrode-covering machine.
Now, as the difference in the thickness on the electrode must be detected to the order of 1/100mm, the higher stability of the source voltage is required for the purpose ; and for installation on the machine, the instrument has to be designed much more carefully so as not to be exposed to the influence of the variation of source voltage than it is the case with a portable.
Unluckily it is not seldom that source voltages vary always from 60 to 100V in almost all the plants.
As things stand, efforts should be made to control the variation of the voltages to the minimum in the wide range of the voltages, but none of the stabilizers which have been formally published satisfies this condition and very much inconvenience has been felt in this respect.
The authors who standing on the ground that the instrument needs only a small power, has studied to solve the problem, at last succeeded in putting the method into practice with the aid of the proper circuit including the "balast-lamp".
Field applications have had good results, showing that the variation of 70% in the voltage corresponds to a mere 2.3% in the load.
It is observed that the variation as such work a negligible effect upon the instrument and does not disturb the Practical working.
