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Proceedings Paper

Beam Absorption Mechanism In Laser Welding
Author(s): Isamu Miyamoto; Hiroshi Maruo; Yoshiaki Arata
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Paper Abstract

Mechanism of laser beam absorption was analyzed in key hole welding of thin plate and deep penetration welding of thick plate on the basis of the two-dimensional cavity model where beam is absorbed by cavity wall and ionized metal vapor. The beam absorptivity of the cavity wall A and the absorption coefficient of the plasma u are approximately 50 % and 1- 1.5 cm-1, respectively. In key hole welding of thin plate, laser beam is absorbed predominantly by the liquid cavity wall and the cavity shape is self-controlled so as to absorb the energy required for bead formation. In deep penetration welding of thick plate, laser power is absorbed mainly by plasma where the self-controlling is less effective, and hence excess energy absorbed at low welding speeds is w'sted to widen the bead with little increase in penetration depth. In vacuum of 10-3-10-4 torr, u decreases down to approximately 0.5 cm-1, providing large penetration depth.

Paper Details

Date Published: 12 November 1986
PDF: 8 pages
Proc. SPIE 0668, Laser Processing: Fundamentals, Applications, and Systems Engineering, (12 November 1986);
Show Author Affiliations
Isamu Miyamoto, Osaka University (Japan)
Hiroshi Maruo, Osaka University (Japan)
Yoshiaki Arata, Osaka University (Japan)

Published in SPIE Proceedings Vol. 0668:
Laser Processing: Fundamentals, Applications, and Systems Engineering
Walter W. Duley; Robert W. Weeks, Editor(s)

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