1975 Volume 44 Issue 9 Pages 739-744
For the practical use of the continuous lay down arc welding method, the effects of the joint part and the current supplying part of the lay down electrode on bead appearance and penetration condition were studied. With the information by this study, the automatic motion mechanism to breakaway the current supplying part from the lay down electrode by perceiving arc heat was developed. The results are sum-marized as follows:
(1)The jointing method of electrode that the electrodes with a projected part and a hollowed part at the side edges is jointed successively by fitting the projected part to the hollowed part is available, and good bead and good penetration are obtained if the topp clearance for the fitting is kept in zero and the side clearance is kept within 0.05 mm.
(2)The current supplying method to the lay down electrode in which the flux is eliminated at the place where the automatic current supplying machine is set, and supply the current under pressing the current supplying element on the current receiving place, and the element is breakaway from the electrode before the arc current arrive on the element, is recommended. The eliminating length of the flux of 10mm and the exposed area of the core wire of 24mm2 is most preferable for the electrode of 6mm diameter to obtain good bead and good penetration.
