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Proceedings Paper

Dual-focus technique for high-power Nd:YAG laser welding of aluminum alloys
Author(s): Takakuni Iwase; Hiroki Sakamoto; Kimihiro Shibata; Bernd Hohenberger; Friedrich Dausinger
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Paper Abstract

In order to apply aluminum alloys to structural components, they should be joined with sufficient strength and quality as high welding speed as possible. High-power laser welding is expected to achieve much higher productivity than conventional joining techniques. Welding of aluminum alloys was performed using 2-kW and 3-kW continuous wave Nd:YAG lasers. Two beams were delivered by optical cables 0.6 mm in diameter and focused on the surface of the specimens as dual spots. Overlap joints of 2-mm-thick sheets were made at various welding parameters, including beam distance, beam arrangement and welding speed. The quality of the bead, including its appearance and macrostructure, and the tensile strength of the joints were investigated. At a shorter beam distance of 0.36 mm, the weld bead surface was humped, making it unacceptable in terms of quality. Sound weld beads were obtained at beam distances of 0.6 mm and 1.0 mm. As the beam distance was increased, the weld depth became shallower. At a beam distance of 1.0 mm, the weld area was too small to provide sufficient strength.

Paper Details

Date Published: 7 February 2000
PDF: 11 pages
Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); doi: 10.1117/12.377042
Show Author Affiliations
Takakuni Iwase, Nissan Motor Co., Ltd. (Japan)
Hiroki Sakamoto, Nissan Motor Co., Ltd. (Japan)
Kimihiro Shibata, Nissan Motor Co., Ltd. (Japan)
Bernd Hohenberger, Univ. Stuttgart (Germany)
Friedrich Dausinger, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 3888:
High-Power Lasers in Manufacturing
Xiangli Chen; Tomoo Fujioka; Akira Matsunawa, Editor(s)

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