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Electron beam welding is a processing method in which electrons emitted from an electron tube are accelerated using a magnetic field or electric field, and the workpiece is heated and melted for welding. The cathode of the electron tube emits thermions when heated. This release phenomenon is based on the same principle as that used for cathode ray tubes. The method of irradiating the work with these thermions and heating and melting is basically performed in a vacuum. As a work, it is possible to process from thick plates to thin plates, and it is characterized by the fact that distortion does not easily remain in the welded part. Recently, a welding method that can be performed in an environment with a low degree of vacuum and an electron gun moving type that emits electrons are also used.

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