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US 6,686,555 B2Granted
Method for plasma jet welding
AssigneesMTU Aero Engines AG, DaimlerChrysler AG
InventorsErwin Bayer, Stefan Laure, Jürgen Steinwandel
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Abstract
A method for plasma jet welding by means of a free radio frequency-induced plasma beam wherein, the rf-induced plasma beam is generated by a procedure involving a second process gas into a tube so that it has a tangential flow component and the introduction of the plasma through a metal expansion jet at the outlet.
Claims20
A method for plasma jet welding by means of a free radio frequency-induced plasma beam, which is generated by the steps of:
- generating of a stationary high-pressure plasma by igniting a first process gas in a pilot plasma welding torch and introducing of the plasma gas into an rf-transparent working tube including a gas inflow opening and a gas outflow opening, with the rf-transparent working tube being wrapped in a coupling coil,
- introducing of a second process gas into the rf-transparent tube at a pressure of p≧1 bar, with the second process gas being introduced into the rf-transparent tube through the gas inflow opening in such a way that it exhibits a tangential flow component,
- generating of an rf-plasma in the rf-transparent tube by electrode-free ignition of the gas mixture;
- and
- generating a plasma beam by introducing the rf plasma into a working space through a metal expansion jet arranged at the gas outflow opening of the tube.
2 more elements
Dependencies are inferred from the claim text.