簡易な自動熔接法の研究(II)

Abstract

Using the same method as described in the previours paper, the effect of the size of interval between core wires of electrodes, which are set parallel to each other, on the welding characteristics of the automatic arc welding was studied, and the following results were obtained. (1) The rate of melting of electrode decreases as the interval increases at a given intensity of electric current, and increases as the intensity of electric current increases at a given size of interval. The relation among the rate of melting of electrode, the size of interval between core wires and the intensity of electric current is given by the following formula.V= (a-bG)IwhereV is the rate of melting of electrode, G the size of interval between core wires and Ithe intensity of electric current, and a and b are constants.The actual rate of melting of electrode in the case where the core wires contact to each other is less than the calculated value with the above formula putting G=0(2) The max. interval across which the arc can move alternately from the one of electrodes to the other at their tips during the course of welding increases as the intensity of electric current increases. It decreases, however, as the diameter of electrode increases.(3) The breadth of bead increases first proportionally with the size of interval within a certain limit and thereafter it increases rapidly as the size of interval increases.(4) The height of bead decreases first proportionally with the size of interval and then it decreases rapidly.(5) The depth of penetration becomes less gradually as the size of interval increases for a certain range while thereafter it decreases rapidly.(6) The rate of deposition of molten electrode metal is greater than 80% for the proportionality range described in.(3) and (4).(7) The appearance of the bead is almost good if the interval of core wires is kept less than a certain size which is approximately equal to the core wire diameter.