Back to results
US 11,504,792 B2Granted
Method and device for welding by means of a non-consumable electrode
AssigneeFronius International GmbH
InventorsPeter Lattner, Josef Artelsmair
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeFronius International GmbH
InventorsPeter Lattner, Josef Artelsmair
Estimating the term…
The invention relates to a method and a device (1) for welding by means of a non-consumable electrode (2), wherein a welding current (I) alternating in polarity at a welding frequency (fS) is applied by a current source (3) between the electrode (2) and a workpiece (4) in order to form an arc (5), and the polarity is changed back to the polarity before the polarity change if the voltage (U) is above the voltage threshold value (US+, US−) and the welding current (I) is below the current threshold value (IS+, IS−). According to the invention, the welding voltage (U) and the welding current (I) after a preset duration (Δt) after the polarity change are compared with the voltage threshold value (US+, US−) and the current threshold value (IS+, IS−), and in addition the power (P) in the arc (5) is determined, and the polarity is changed back if the welding voltage (U) is greater than the voltage threshold value (US+, US−), and/or if the welding current (I) is less than the current threshold value (IS+, IS−), and/or the determined power (P) is less than a preset power threshold value (PS).
A method for welding by means of a non-consumable electrode (2), in particular a tungsten electrode, wherein a welding current (I) alternating in polarity at a welding frequency (fS) is applied by a current source (3) between the electrode (2) and a workpiece (4) in order to form an arc (5), and after a change in polarity the welding voltage (U) and the welding current (I) between the electrode (2) and the workpiece (4) are measured and the voltage (U) is compared with a preset voltage threshold value (US+, US−) and the welding current (I) is compared with a preset current threshold value (IS+, IS−) and the polarity is changed back to the polarity before the polarity change if the voltage (U) is above the voltage threshold value (US+, US−) and the welding current (I) is below the current threshold value (IS+, IS−), wherein the welding voltage (U) and the welding current (I) after a preset duration (Δt) after the polarity change are compared with the voltage threshold value (US+, US−) and the current threshold value (IS+, IS−), and in addition the power (P) in the arc (5) is determined, and the polarity is changed back to the polarity before the polarity change if the welding voltage (U) is greater than the voltage threshold value (US+, US−), and/or if the welding current (I) is less than the current threshold value (IS+, IS−), and/or the determined power (P) is less than a preset power threshold value (PS).
A device (1) for welding by means of a non-consumable electrode (2), in particular a tungsten electrode, having a current source (3) for applying a welding current (I) alternating in polarity at a welding frequency (fS) between the electrode (2) and a workpiece (4) to form an arc (5), and having a control device (6) which is designed to measure the welding voltage (U) between the non-consumable electrode (2) and the workpiece (4) and the welding current (I) after the change in polarity and to compare the measured voltage (U) with a preset voltage threshold value (US+, US−) and the measured welding current (I) with a preset current threshold value (IS+, IS−), wherein the control device (6) is designed for carrying out a method for welding by means of the non-consumable electrode (2), in particular the tungsten electrode, wherein the welding current (I) alternating in polarity at the welding frequency (fS) is applied by the current source (3) between the electrode (2) and the workpiece (4) in order to form the arc (5), and after a change in polarity the welding voltage (U) and the welding current (I) between the electrode (2) and the workpiece (4) are measured and the voltage (U) is compared with a preset voltage threshold value (US+, US−) and the welding current (I) is compared with the preset current threshold value (IS+, IS−) and the polarity is changed back to the polarity before the polarity change if the voltage (U) is above the voltage threshold value (US+, US−) and the welding current (I) is below the current threshold value (IS+, IS−), wherein the welding voltage (U) and the welding current (I) after a preset duration (Δt) after the polarity change are compared with the voltage threshold value (US+, US−) and the current threshold value (IS+, IS−), and in addition the power (P) in the arc (5) is determined, and the polarity is changed back to the polarity before the polarity change if the welding voltage (U) is greater than the voltage threshold value (US+, US−), and/or if the welding current (I) is less than the current threshold value (IS+, IS−), and/or the determined power (P) is less than a preset power threshold value (PS).
Dependencies are inferred from the claim text.