Method and apparatus for electron beam welding
AssigneeNational Research Institute for Metals
InventorsTatsuya Hashimoto, Michio Inagaki, Hirosada Irie, Susumu Tukamoto
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Abstract
A method and an apparatus for electron beam welding, in which the oscillation of the focus of an electron beam which is due to the pulsation of a direct-current high voltage for accelerating electrons is detected, and the electron beam is controlled according to the detected oscillation of the focus of the electron beam.
Claims37
In a method for electron beam welding which comprises producing electrons, accelerating the electrons by the application of a high voltage to form an electron beam, converging and focusing the electron beam with a converging lens, and irradiating the converged electron beam onto materials to be welded, thereby forming a molten area on the materials to be welded, the improvement wherein the output of a welding device is detected, from which an oscillation of the focus of said electron beam which is due to a low frequency pulsation in said high voltage is detected, and the electron beam is controlled according to the detected oscillation of said focus for a period of time not more than one half the period of the pulsation.
In an electron beam welding apparatus comprising an electron gun having a filament, a heating power source for supplying an electric current to the filament to heat it and release electrons from the filament and a high voltage power source for accelerating the electrons by the application of a high voltage to form an electron beam;
- and a converging lens for converging and focusing the electron beam from the electron gun and irradiating the electron beam onto materials to be welded;
- the improvement wherein said apparatus further comprises a detecting means for detecting the output of a welding device from which an oscillation of the focus of the electron beam which is due to a low frequency pulsation in said high voltage, and a control means for controlling the electron beam according to the detected oscillation of said focus for a period of time not more than one half the period of the pulsation.
Dependencies are inferred from the claim text.