Control of interval joining process
AssigneeFronius International GmbH
InventorDominik SÖLLINGER
Life of this patent
Estimating the term…
Abstract
In order to more accurately control the heat input that is introduced into a workpiece to be joined as part of an arc interval joining process, a first pause duration of a first pause phase is determined during the arc interval joining process and, in the event that the determined first pause duration deviates from a specified target pause duration, at least one joining parameter of the arc interval joining process, which influences the pause durations of the pause phases, is changed in order to reduce a deviation between a second pause duration of a second pause phase, which follows the first pause phase in time, and the specified target pause duration compared to the deviation of the first pause duration from the target pause duration.
Claims11
An arc interval joining process comprising a sequence of arc phases and pause phases, wherein the arc phases have a specified arc duration and alternate in time with the pause phases, wherein in the arc phases a joining current flows between a joining electrode and a workpiece for joining the workpiece, and no joining current flows in the pause phases, wherein the arc interval joining process is an arc interval welding process or an arc interval brazing process, wherein in the arc phases, at least temporarily, an arc is established between the joining electrode and the workpiece, through which arc the joining current for joining flows from the joining electrode to the workpiece, wherein at the beginning of each pause phase, the arc is extinguished at an extinction moment and is reignited at the end of each pause phase at an ignition moment, and the arc is ignited at the beginning of each arc phase at an ignition moment and is extinguished at the end of each arc phase at an extinction moment, and wherein a time period between an extinction moment and an ignition moment directly following this extinction moment corresponds to a pause duration of an associated pause phase, and a time period between an ignition moment and an extinction moment directly following this ignition moment corresponds to an arc duration of an associated arc phase, wherein, during the arc interval joining process, a first pause duration of a first pause phase is determined, and wherein, in the event that the determined first pause duration deviates from a specified target pause duration, at least one joining parameter of the arc interval joining process, which influences the pause durations of the pause phases, is changed in order to reduce a deviation between a second pause duration of a second pause phase, which follows the first pause phase in time, and the specified target pause duration compared to the deviation of the first pause duration from the target pause duration.
(canceled)
A welding apparatus for carrying out an arc interval joining process, wherein the arc interval joining process comprises a sequence of arc phases with a specified arc duration and pause phases alternating in time with the arc phases, wherein in the arc phases a joining current flows between a joining electrode and a workpiece to join the workpiece, and in the pause phases no joining current flows, wherein the arc interval joining process is an arc interval welding process or an arc interval brazing process, wherein in the arc phases an arc is established at least temporarily between the joining electrode and the workpiece, through which arc the joining current for joining flows from the joining electrode to the workpiece, wherein at the beginning of each pause phase, the arc is extinguished at an extinction moment and is reignited at the end of each pause phase at an ignition moment, and the arc is ignited at the beginning of each arc phase at an ignition moment and is extinguished at the end of each arc phase at an extinction moment, and wherein a time period between an extinction moment and an ignition moment directly following this extinction moment corresponds to a pause duration of an associated pause phase, and a time period between an ignition moment and an extinction moment directly following this ignition moment corresponds to an arc duration of an associated arc phase, comprising a welding torch to generate an arc for introducing energy at a joining site on the workpiece for generating a molten pool, comprising a feed unit for feeding the joining electrode to the molten pool, wherein the joining electrode can be melted in the region of the molten pool by the energy introduced by the welding torch in order to produce a seam on the workpiece, and comprising a control unit for controlling the welding apparatus, wherein the control unit is designed to determine a first pause duration of a first pause phase during the arc interval joining process, and, in the event that the determined first pause duration deviates from a specified target pause duration, to change at least one joining parameter of the arc interval joining process which influences the pause durations of the pause phases in order to reduce a deviation between a second pause duration of a second pause phase, which follows the first pause phase in time, and the specified target pause duration compared to the deviation of the first pause duration from the target pause duration.
Dependencies are inferred from the claim text.