Electron beam welding at ISI Brno

0494361 - ÚPT 2019 RIV CZ eng C - Conference Paper (international conference)
Dupák, Libor - Zobač, Martin - Vlček, Ivan - Zobačová, Jitka
Electron beam welding at ISI Brno.
Recent Trends in Charged Particle Optics and Surface Physics Instrumentation. Proceedings of the 16th International Seminar. Brno: Institute of Scientific Instruments The Czech Academy of Sciences, 2018, s. 18-20. ISBN 978-80-87441-23-7.
[Recent Trends in Charged Particle Optics and Surface Physics Instrumentation. Skalský dvůr (CZ), 04.06.2018-08.06.2018]
R&D Projects: GA MŠMT(CZ) LO1212; GA MŠMT ED0017/01/01
Institutional support: RVO:68081731
Keywords : electron beam welding
OECD category: Mechanical engineering

In vacuum technology, and especially in UHV, we often encounter the necessity of joining
parts of various metals in combination with the demand for perfect vacuum tightness,
cleanness of joints and minimum deformations. Electron beam welding belongs to the
best technologies capable of fulfilling such requirements.
The principle of electron beam welding is based on the transfer of the kinetic energy of the
incident accelerated electrons to the welded material in the form of heat. The temperature in
the spot rises with the beam power density. At power densities as high as 104 - 106 W/mm2,
the melted material at the center of the focal point evaporates. This produces a vapor capillary surrounded by melted material that allows the beam to penetrate deeper and melt more material. The speed of the penetration can be much higher than the heat transfer by
conduction into the surrounding material. This results in narrow melted area and typical knifelike
profile of the weld. Thanks to this effect the thermal deformations of welded
pieces are highly reduced to almost none. Small heat affected zone also allows welding near
heat sensitive parts like sensors, ceramic feed-throughs and brazed joints.
Permanent Link: http://hdl.handle.net/11104/0287591