| 摘要 |
<p>There is provided. a method. of positioning an electron beam comprising: i) impinging an electron beam (16) on a region to be modified; ii) measuring intensity of electromagnetic radiation produced from the region; and iii) modifying the electron beam characteristics in response to the measured intensity of the electromagnetic radiation. An initial scan is undertaken to identify a 10 position where a minimum or maximum intensity occurs to identify the location of a joint or to focus the electron beam (16). There is also provided apparatus for positioning an electron beam (16) comprising a sensing means (26) to measure intensity of electromagnetic radiation emitted from a weld region, and a controller (30) in communication with the sensing means and. in communication with an actuation means (32) capable of adjusting characteristics of an electron is beam. The controller (30) is configured to alter the actuation means (32) to adjust the electron beam characteristics in response to measured intensity. The electron beam may be used in welding, melting, drilling or machining applications</p> |
