| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect defects at a welding portion without having effects from the position and posture of a laser torch by arranging a condensing lens of welding lights ejected from a weld zone in a box member of the laser torch in a manner to be coaxial with an optical axis of the laser ejected to work, so as to detect the light strength from the welding portion. SOLUTION: After the welding light ejected from the weld zone of a work 14 is condensed by a condensing lens 15, the plasma light generated in the process of welding and the reflection light of the irradiation laser light are separated by a YAG light reflection mirror 16. After the separation, the plasma light passes through a YAG light cut filter 17, and is then converted into voltage signals corresponding to the light strength in a photodiode 20 and an amplifier 21. The reflection light from the YAG light reflection mirror 16 passes through a YAG light transmitting area filter 18, and is then converted into voltage signals corresponding to the light strength in a photodiode 24 and an amplifier 25. A welding condition judging treatment device 23 carries out the judging treatment such as the defect detection based on the voltage signals from the amplifiers 21 and 25.</p> |
