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Volume 2009 I Issue 3
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Menhard, Christian Georg
; Löwer, Thorsten
The electron beam geometry – Definition, measurement
and significance for the welding process
Welding and Cutting 8 (2009) [3] 138-142
Specialist Articles
Abstract:
Although electron beam welding has been a reliable and flexible
procedure in materials processing for a long time, only little
attention has been paid to the electron beam geometry until
now. This is mainly because its measurement is often very complicated
and time-intensive. Central geometrical parameters
such as the beam divergence and diameter are used only rarely
since, in their current definition, they can describe the propagation
of electron beams only inadequately. More recent developments
may solve most of these problems. The diameter and divergence
of a beam can be defined for any power distributions
by applying special mathematical relationships. Furthermore,
the beam parameter product can thus be introduced as the central
conservation variable of the beam propagation and permits
statements about the focusability of an electron beam bundle.
By utilising modern computer technology, efficient control engineering
and quick beam deflection systems, it will be possible
in future to measure all the beam geometry parameters in a
matter of seconds. This will give the user access not only to the
already well-known power-related parameters but now also to
the beam geometry. This is relevant to the process stability, to
the transferability of processes to different installations and to
the selection of suitable beam sources.
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