Laser welding quality evaluation method and apparatus

摘要

PPROBLEM TO BE SOLVED: To provide a method and apparatus for evaluating laser welding quality, in which appropriate evaluation of welding quality is possible even if an incident angle of a laser beam is different. PSOLUTION: A reflection light distribution information acquisition circuit 10 for acquiring distribution information of laser reflection light B in a laser irradiation position and its periphery; an incident angle information acquisition circuit 11 for acquiring incident angle information for a workpiece W ; and a welding quality determining circuit 13 for determining the welding quality on the basis of the result obtained by analyzing while the laser reflection distribution information from the circuit 10 is associated with the incident angle information from the incident angle information acquisition circuit 11, and the analytical result group of the laser reflection distribution information for each incident angle information which is preliminarily acquired, are set for evaluating the quality of laser welding performed by irradiating the workpiece W with a laser beam A whose incident angle is variable. The laser reflection distribution information is analyzed depending on laser incident angles, so that the formation state (welding quality) of varying molten metal and a key hole can be evaluated for each laser incident angle. PCOPYRIGHT: (C)2011,JPO&INPIT