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Process studies on laser welding of copper with brilliant green and infrared lasers

: Engler, S.; Ramsayer, R.; Poprawe, R.

Postprint (PDF; )

Schmidt, M. ; Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Lasers in Manufacturing 2011, Sixth International WLT Conference on Lasers in Manufacturing. Proceedings : May 23-26, 2011, München; LiM 2011
Amsterdam: Elsevier, 2011 (Physics Procedia 12. 2011, Pt.2)
ISSN: 1875-3892
International Conference on Lasers in Manufacturing (LIM) <6, 2011, München>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ILT ()

Copper materials are classified as difficult to weld with state-of-the-art lasers. High thermal conductivity in combination with low absorption at room temperature require high intensities for reaching a deep penetration welding process. The low absorption also causes high sensitivity to variations in surface conditions. Green laser radiation shows a considerable higher absorption at room temperature. This reduces the threshold intensity for deep penetration welding significantly. The influence of the green wavelength on energy coupling during heat conduction welding and deep penetration welding as well as the influence on the weld shape has been investigated.