elektronenoptik for a elektronenstrahlschweißmaschine

摘要

Electron beam welding machine has an electron gun with a Wehnelt electrode between the cathode and the tubular anode. It produces a beam of high directivity and a large aperture angle which passes through an intermediate lens in the anode mount. This lens is set to focus the beam to a smaller divergent aperture angle and is followed by adjusting coils. The cut-off frequency for the magnetic reversal of the intermediate lens is at least 500 Hz. The high directivity results in a better weld penetration, i.e. a very deep and very narrow seam over a wide working range.