PROCESS FOR THE PLASMA SPOT WELDING OF SURFACE-TREATED WORKPIECES AND PLASMA TORCH
First Claim
1. A process for the plasma spot welding of surface-treated workpieces using a plasma torch, comprising:
- supplying a plasma-generating gas to the plasma torch,connecting a first terminal (−
) of a current source to an electrode of the plasma torch,connecting a second terminal (+) of the current source to a workpiece to be welded,building up at least one plasma arc from the electrode of the torch toward the workpiece by applying electric current (I(t)) from the current source to an anode-cathode path between the electrode and the workpiece, wherein;
the electric current is kept in a preprocessing current range (IV) in a phase I, andin a subsequent phase II, the electric current (I(t)) is kept at a main processing current value (IH) or range the average value of which is higher than the average preprocessing current range (IV).
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Abstract
A process for plasma spot welding of surface-treated workpieces using a plasma torch comprises supplying a plasma-generating gas to the plasma torch, connecting a first terminal (−) of a current source to an electrode of the plasma torch, connecting a second terminal (+) of the current source to a workpiece, building up at least one plasma arc from the electrode of the torch toward the workpiece by applying electric current (I(t)) from the current source to an anode-cathode path between the electrode and the workpiece. The electric current (I(t)) is kept in a preprocessing current range (IV) in a phase I and, in a subsequent phase II, at a main processing current value (IH) having an the average value of which is higher than the average preprocessing current range (IV). Phase I is maintained at least until the at least partial evaporation of surface treatment layers of the workpieces in a joining zone.
40 Citations
20 Claims
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1. A process for the plasma spot welding of surface-treated workpieces using a plasma torch, comprising:
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supplying a plasma-generating gas to the plasma torch, connecting a first terminal (−
) of a current source to an electrode of the plasma torch,connecting a second terminal (+) of the current source to a workpiece to be welded, building up at least one plasma arc from the electrode of the torch toward the workpiece by applying electric current (I(t)) from the current source to an anode-cathode path between the electrode and the workpiece, wherein; the electric current is kept in a preprocessing current range (IV) in a phase I, and in a subsequent phase II, the electric current (I(t)) is kept at a main processing current value (IH) or range the average value of which is higher than the average preprocessing current range (IV). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20)
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12. A plasma torch for welding and cutting workpieces, comprising:
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an electrode for connection to a first terminal of a current source, an electroconductive plasma nozzle surrounding the electrode at a distance, with an inner flow channel for plasma-generating gas being formed between the electrode and the plasma nozzle, and a support ring surrounding the plasma nozzle at a distance for attachment on the surface of a workpiece, the support ring exhibiting through openings distributed around its periphery and spaced apart from an attachment zone, wherein; a gas guiding sleeve is arranged between the plasma nozzle and the support ring, which gas guiding sleeve projects axially beyond the front end of the plasma nozzle, but is shorter than the support ring, and the gas guiding sleeve is spaced apart from the plasma nozzle and the support ring and thereby forms an outer flow channel for the plasma-generating gas or protective gas, respectively, between the plasma nozzle and the gas guiding sleeve. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification