Abstract
To investigate the weldabilities of Killed and Rimmed steels, using the electrodes of the types of both Low-Hydrogen and Ilmenite the low temperature-brittle ness tests are carried out by the "Synthetic Impact Test Method. As the effect of the electrodes for the weldabilities it was recognized that Low-hydrogen type is superior than Ilmenite, but, in the temperature range lower than -20°C, there is no differenses in the impact values. As the effects of the steels types, Killed steel is excellent, but no differenses lower than 0°C. So that there exist no differenses in the point of impact values, at the temperatures lower than -20°C., in spite of the types of the electrodes and the kinds of the steels, and these phenomena will, mainly, depend upon the mechanisms of the clack propagations, which initiates in the heat-affected parent plates. Transition zone of the rimmed steel is wider than killed, and the first sign of the brittleness is higher temperature than killed.
