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Direct
Diode Laser Welding
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Welding of the 2.5mm thick 5xxx aluminum series to the
4mm thick 6xxx aluminum series, was conducted using a 4.0kW
High Power Direct Diode Laser (HPDDL) from Nuvonyx, Inc.
All welding was conducted autogenously. The figures below
show two different cross-sections of these welds, welded
with slightly different parameters.
One of the advantages of the HPDD laser from Nuvonyx, Inc.
is that it has a wavelength of approximately 810nm, which
coincides with the absorption peak for aluminum. This increases
the power effect on the aluminum alloy without increasing
the power delivered as compared to other lasers.
The HPDDL was also chosen for this project due to some of
the other advantages of the direct diode lasers which are;
the high wall plug efficiency, order of magnitude smaller
footprint, lower maintenance, and high control bandwidth.
The HPDDL are very small and compact, such that the entire
laser head can easily be mounted to the end of the robotic
arm[ J.M. Haake. "Applications and Benefits
of Direct Diode Lasers". Laser Processing Consortium - Industrial
Laser Processing Workshop, 1999 ].
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