| 摘要 |
PURPOSE:To decrease remarkably friction resistance of welding wire, to improve feeding property, and to obtain weld zone of good quality, by drawing the welding wire through specific method so as to adjust its surface flatness in a specific range. CONSTITUTION:Wire 3 covered with lubricating oil, which is brought into an approach pipe 5 with the wire 3 by passing it through approach pipe 5, is drawn compulsorily by means of a die 7 at a high press. (15-80% of yield stress of the wire 3) into a wire 4 of a prescribed size. At that time its surface flatness shown by an attached table (a table showing the relation between the ratio lubricant press./ yield stress, and surface flatness of wire) is 80% or under. This method removes the defect, i.e., insufficient preservation of lubricating oil due to the flatness of the wire surface, so that the friction resistance between the wire and the insidesurface of the conduit tube is remarkably reduced. As the result, buckling while being fed is prevented, arc is stabilized because of the smooth feed, hence weld zone of good quality is obtained. |
