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Příručka pro uživatele svářeček

Princip elektronové trysky

Cílem příručky je seznámit uživatele technologického zařízení s elektronovým svazkem pro svařování (elektronové svářečky) s tím co je nutné nebo užitečné vědět, aby bylo možné optimálně využít zvláštností tohoto způsobu ohřevu a dosáhnout požadovaných výsledků.

Electron beam welding of thin-walled parts

Crosssection of an membrane bellows welded by the electron beam

When some devices (e.g. vacuum or cryogenics) are manufactured, the need to weld thin-walled parts is often met. Application of electron beam for this purpose may bring, compared with micro-plasma or laser) some valuable advantages balancing its higher costs. But good results could only be achieved if certain conditions, which will be explained in the following article, are fulfilled.

Depth of weld

Metalograpics cross-section of welding sample

The depth of penetration of electron beam into material (in solid state) depends on more factors. The most important of them are the total power of the beam and the power density in the cross-section of the beam (the focusation). It also depends on position of the „cross-over“ (focus) relative to the surface (deeper penetrations are achieved with slightly "under-focused beam). Furthermore the weld depth depends on physical properties of the material and welding speed. On energy of electrons in the beam (accelerating voltage) the penetration depends only indirectly, so that at higher voltages higher values of power density are achieved.

Coaxial fedthrough on ISO-KF 16 flange

Coaxial feedthrough on ISO-KF 16 flange - air side

This coaxial (one conductor) feedthrough is suitable for transferring DC or AC signals (including RF) into vacuum. It is vacuum-tight sealed into ISO-KF 16 flange, including O-ring support. On air-side is designed for type N receptacle, on vacuum-side for soldering. The conductor is gold-plated.

9 pin d-sub feedthrough on ISO-KF 25 flange

9 pin d-sub feedthrough on ISO-KF 25 flange - air side

The 9 pin d-sub feedthrough is vacuum-tight glass-sealed into an ISO-KF 25 flange provided with O-ring support. For the connection on the vacuum side a bare receptacle can be used, or the connecting wires can be soldered to the pins.

Laboratory vacuum furnace

Working chamber of the laboratory vacuum furnace

Parameters:

  • maximum batch dimensions: diameter up to 150 mm, height 200 mm; for objects not exceeding 18 mm in diameter the height can be extended.
  • maximum temperature: 1100°C,
  • copper and/or silver or nickel – based solders.
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