Laser beam heat treatment has been established during the last years as a complementary technology for local hardening
treatment tasks at tool manufacturing, automotive industry and many others. Especially new high power diode lasers and
a lot of process supporting systems, what have been developed in recent years, are responsible for the increase of
industrial laser hardening applications. The short course starts with information about the basics of laser heat treatment.
After that a review about suitable lasers and recommended systems for reliable and well adapted laser heat treatment
processes is given. Examples of last ten years transfer of laser beam hardening into industry are presented and discussed.
Heat Treatment is one of the most promising application of multi kilowatt high power diode lasers. Providing a sufficient beam quality HPDL's have the advantage of their high efficiency comparing to Nd:YAG-lasers. Application of scanning mirror optics for multi kilowatt lasers is well known at CO2- or Nd:YAG-lasers. Fraunhofer IWS has developed a special driver unit, which generates automatically an optimized scanning function to provide a stress adapted intensity profile. Know the application of this technology at multi kilowatt high power diode lasers has been implemented successfully. Using 2.5 kW diode laser power hardening tracks of 30 mm in width and a penetration of about 1 mm are possible. Applying the temperature guide laser power controller LompocPro additionally, stress adapted hardening of edges with varying cross sections became possible. Besides hardening this system allows heat treatment with a rectangular beam of 5 x 85 mm2. Some applications show the performance of this technology.
Laser Beam Hardening with High Power Diode Lasers is presented as an excellent method for local heat treatment and minimum distortion. An overview is given about several strategies for local heat treatment and different industrial applications. Precise measuring and controlling of the surface temperature makes the process very reliable and is an essential tool for industrial users. To keep a constant penetration of the hardening zone at constant surface temperatures the feed rate can be adapted to local heat flow conditions. A former postprocessor of Fraunhofer IWS generates a CNC-program for the treatment and changes the feed rate in dependence of the surface shape. The new processor additionally considers local heat flow variations of a part caused by boreholes, grooves and changing local thickness. The processing is very fast and can be applied for solving daily problems of laser beam hardening. Some examples show the performance of the new postprocessor.
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