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Electron Beam Welding Generators

Sanderson Allan

An electron beam generator for use in electron beam welding wherein the electron beam passes through at least two electromagnetic beam deflecting systems upstream of the electron lens and which act one after another on the beam to define a fixed nonlinear path for the electron beam from the electron gun towards the welding point on a predetermined welding axis, with the other paths being blocked. The fixed path is such that the portion of the beam leaving the last deflecting system is parallel to the portion of the beam from the gun to the first deflection system, and at least one of the beam deflecting systems is offset with respect to the welding axis. In some arrangements the first and last beam portions are in alignment. The coils of the beam deflecting systems are connected in a circuit for controlling the ratio of currents passing through the coils so that the system as a whole is self-compensating for changes in voltage or beam current.

US 54401075 A

1978

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