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Proceedings Paper

Deep fusion laser welding using pulses of two-level power density
Author(s): Vladimir Ganjuczenko; Svetlana Vologdina; Franciszek Kostrubiec
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Paper Abstract

In the paper a conception of deep fusion laser welding using laser pulses of complex time characteristics has been discussed. The technology of generating pulses of such a shape has already been developed on an industrial scale. The pulse envelope q(t) assumed in the analysis has a `stepwise' shape and two time intervals of different power, q'((tau) '-(tau) ') and q'((tau) '''-(tau) '), can be distinguished in it. In the first interval, the pulse power q ensures the fusion on the metal and formation of a vapor-gaseous passage. At the beginning of the second interval, a stepwise increase in the pulse power to the value q' occurs, which leads to intensive evaporation of the metal in the front part on the vapor-gaseous passage and to an increase in the pressure of metal vapors in the vapor-gaseous passage. The vapor pressure causes `extrusion' on the liquid metal from the front to the rear passage wall. The whole process is of cyclic character. In the paper, energetic process in the first and the second part of one fusion welding cycle have been analyzed. An algorithm of procedure for determining proper welding conditions has been proposed. Finally, an example of calculating technological conditions of steel-welding has been presented.

Paper Details

Date Published: 1 March 1995
PDF: 6 pages
Proc. SPIE 2202, Laser Technology IV: Research Trends, Instrumentation, and Applications in Metrology and Materials Processing, (1 March 1995); doi: 10.1117/12.203267
Show Author Affiliations
Vladimir Ganjuczenko, Electrical Univ. of St. Petersburg (Russia)
Svetlana Vologdina, Electrical Univ. of St. Petersburg (Russia)
Franciszek Kostrubiec, Technical Univ. of Lodz (Poland)

Published in SPIE Proceedings Vol. 2202:
Laser Technology IV: Research Trends, Instrumentation, and Applications in Metrology and Materials Processing
Wieslaw L. Wolinski; Zdzislaw Jankiewicz; Jerzy K. Gajda; Bohdan K. Wolczak, Editor(s)

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