Fraunhofer IWS develops new laser processing for electrical steel
Germany, Dresden: The Fraunhofer Institute for Material and Beam Technology IWS is developing a new laser processing in order to reduce hysteresis loss in electrical steel.
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Germany, Dresden: The Fraunhofer Institute for Material and Beam Technology IWS is developing new laser processing in order to reduce hysteresis loss in electrical steel.
“By heating selected areas of the material, it is possible to reduce the size of the domains with the same magnetic orientation, which in turn alters the magnetic structure of the steel.“ says Dr. Andreas Wetzig, who heads the laser ablation and cutting department at the Fraunhofer Institute for Material and Beam Technology IWS.
In laser processing, while the steel sheet, measuring around one metre in width, moves forward at a rate of more than 100 metres per minute, a focused laser beam travels at very high speed (approximately 200 metres per second) from side to side across the surface of the material along paths spaced a few millimetres apart.
“We have developed a means of deflecting the laser beam that allows the distance between the paths to be controlled flexibly and adapted to different parameters.” reports Wetzig. The researchers make use of galvanometer scanners which consist of galvanometer driven mirrors attached to one end used to deflect the laser beam.
The researchers have also recently started working with a new type of solid-state laser: the fiber laser, reports Phys Org.
“The results we have obtained so far are very promising. This type of laser offers better heat absorption characteristics than traditional CO2 lasers.” says Wetzig. The optimised process is currently being implemented by the first commercial customer.
Source: Phys Org
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