Vol.3 No.2 (March 2013)
Study of Laser Hardening Used in Cylindrical
Laser hardening by means of diode laser is an innovative technique in industrial applications, but when the treated surface is larger than the laser spot, lap weld tempering, a well-known problem in laser hardening occurs. To avoid the lap weld tempering phenomenon, Visible Spot (VS) technique is investigated for cylindrical workpieces. In case of shaft parts, circular laser hardening is adopted by imposing a high rotational speed to the workpieces under the close loop control laser hardening system. A circular apparent spot is generated to heat the all the annular surface of the workpiece contemporaneously, as a consequence, lap weld tempering is avoided.
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