Patent ID: 9035220
Filing Date: 2015-05-19
Classification: B23K

Abstract:
1. A cold-metal-transfer welding process performed by a welding installation, the cold-metal transfer process being defined by cyclic alternation of an electric arc phase and a short-circuit phase; wherein, during the electric arc phase, a welding wire is moved in a direction of a workpiece until contacting the workpiece; wherein subsequently, after formation of a short-circuit and during the short-circuit phase, a wire transport is reversed and the welding wire is moved away from the workpiece; wherein at least one of a welding current and a welding voltage are controlled during the electric arc phase in such a manner that the welding wire is melted to form a droplet; wherein formation of an electric arc during the short-circuit phase is prevented via the welding current; wherein a movement frequency of the welding wire and at least one additional welding parameter are directly elected and input into a control element of the welding installation by a user, a number of electric arc phases and short-circuit phases per second being defined by the movement frequency; wherein the movement frequency and the at least one additional welding parameter are transmitted to a control device of the welding installation; wherein all other welding parameters required to implement the movement frequency are automatically determined and set and controlled by the control device based on the movement frequency and the at least one additional welding parameter; wherein a length of the electric arc between the welding wire and the workpiece is monitored during the electric arc phase; wherein changes in the length of the electric arc are controlled via a wire feed speed and the welding current in such a manner as to cause the short-circuit phase to occur at the movement frequency; and wherein the at least one additional welding parameter is selected from the group consisting of a material of the workpiece, a material thickness of the workpiece, a diameter of the welding wire, a melting rate of the welding wire, and a heat input into the workpiece.