| 摘要 |
A charge particle beam generator is described which comprises an annular arrangement of filaments (6) which, when heated, emit electrons. A microprocessor controller (not shown) causes a voltage to be applied across each filament (6) in succession so as to cause the filament to generate electrons. An annular anode (9) is provided radially inwardly of the filaments (6) to accelerated electrons away from the filaments in the form of a beam towards a joint between a pair of workpieces to be welded.
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