distance of '/2 to 3/4 of an inch. This behavior made crater formation and lack of arc stability indicate welding very difficult, for while the arc would be that intrinsically the high current arc is something emanating from the side of the electrode, the arc quite different from that with which we have become, voltage would be high and the welding head auto-acquainted by observing only the arc between steel matically would feed the rod down to lower the electrodes in air. Other purely metallurgical aspects voltage, until finally the end of the rod would ram of the investigation are to be reported elsewhere.into the base metal and cause a complete short circuit. However, this same phenomenon did not take REFERENCES place when the electrode polarity was positive, but the arc then would jump around on the plate in a 1. RESEARCHES IN ARC WELDING, G. E. Doan and J. L. Myer. ELEC. ENGG., very erratic manner. When the electrode was v. 51, Sept. 1932, p. 624-7. negative and the sull coating remained on the rod, 2. ARC DISCHARGE NOT OBTAINED IN PURE ARGON GAs, G. E. Doan and J. L. the arc emanated steadily from the end of the elec-Myer.
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