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In spite of the fact that the stability of the arc is essential for applying the arc to the welding, there have been comparatively less reported about it, while the efforts to stabilize the arc have been made. It seems to be chiefly because the problem to stabilize the welding arc includes too many factors to consider quantiatively. It is our aim to express quantitatively the stability of the welding arc through the analysis of the after-arc-phenomenon. As mentioned later, the conductivity of the arc space was continuously measured after the arc was extinguished through the interrupter which operated in syncronous with the oscillograph. These were performed under the consideration that the duration of the conducticity after the extinction of the arc means the order of the possibility of the reignition of the arc; namely stability. The results are confirmed as follows; a) The conductivity of the after-arc space continues comparatively long time of abut 0.5 seconds. b) The duration of the after-arc phenomenon is severely influenced by the arc length namely the arc voltage. c) The duration of the after-arc phenomenon is not influenced by the arc current, but by the kind of the materials of the electrodes.
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