Patent ID: 8716626
Filing Date: 2014-05-06
Classification: B23K

Abstract:
1. A shielded metal arc welding machine having a constant current output characteristic, comprising: a welding machine controller for controlling the welding machine, including a target welding current calculating device having a drooping output characteristic, said target welding current calculating device having an optional drooping degree by connecting two points, one of the two points being a base point at which a characteristic line of said constant current output characteristic intersects a welding load characteristic line, and the other of the two points being set on an output current line of welding voltage V =0 as a predetermined value, which is derived by multiplying a short-circuit current value by a multiple value, and the drooping output characteristics replaces said constant current output characteristic, said drooping output characteristic being based on a following formula: said drooping output characteristic being controlled by obtaining the drooping degree by calculation by setting a multiple value of a short-circuit current with respect to a set value of a welding current and a detected value of a welding voltage, instead of setting the drooping degree, that is, an inclination angle, said welding machine controller controlling said welding machine according to the drooping characteristic which is derived by connecting the two points.