Predictive of Electron Beam Focus Position by Metal Powder Temperature

Abstract:

Article Preview

The equipment for measuring electron beam (EB) focus in electron beam produced by the effect of extremum temperature of powder molten pool caused by the interactive effect of electron beam with metal powder is described. The principle of operation of apparatus and examples of EB characteristics are presented. During electron beam processing, the mechanical analysis of metal powder molten pool temperature following focusing current are studied. As a result, the transferring point of critical energy density described by the peak of metal powder pool temperature can be obtained. Based on the temperature characteristics of critical energy density, the measuring concept of dynamic focal spot of electron beam is put forward in the paper. The method of measuring dynamic focal spot of electron beam will provide a new possibility for 3D scanning prototyping through changing focus position of EB.

Info:

Periodical:

Edited by:

Xianghua Liu, Zhenhua Bai, Yuanhua Shuang, Cunlong Zhou and Jian Shao

Pages:

1779-1785

Citation:

Y. X. Chen et al., "Predictive of Electron Beam Focus Position by Metal Powder Temperature", Applied Mechanics and Materials, Vols. 217-219, pp. 1779-1785, 2012

Online since:

November 2012

Export:

Price:

$41.00

[1] Wojcicki S, Mladenov G. A new method of experimental investigation of high - power electron beam. Vacuum. 58 (2000), pp.523-530.

DOI: https://doi.org/10.1016/s0042-207x(00)00215-3

[2] Katarzyna Olszewska, Kazimierz Friedel. Control of the electron beam active zone position in electron beam welding processes. Vacuum. 74 (2004), pp.29-43.

DOI: https://doi.org/10.1016/j.vacuum.2003.11.004

[3] Zhou Qi, LIU Fang-jun, Guan Qiao. Method of varying focus- extremum of critical penetrating current measuring electron beam dynamic focal spot. TRANSACTIONS OF THE CHINA WELDING INSTITUTION. 25(5) (2004), pp.77-84.

[4] Paolo Ferro, Andrea Zambon, Franco Bonollo. Investigation of electron-beam welding in wrought Inconel 706-experimental and numerical analysis. Materials Science and Engineering A . 392 (2005), pp.94-105.

DOI: https://doi.org/10.1016/j.msea.2004.10.039

[5] Da Dao-an. Vacuum Design Manual. Revision. BEIJING, National Defense Industry Press (1995) , pp.53-60.

[6] Wu Hui-qiang, Feng Ji-cai, He Jing-shan, et al. Three-dimensional calculation of temperature and stress field in Al-Li alloy during electron beam welding by finite element analysis. Welding Technology. 33(6) (2004), pp.10-12.