Laser penetration welding monitoring system and laser through welding monitoring method

摘要

Problem to be solved: to provide a laser penetration welding monitoring technique capable of determining whether or not the welding has passed through even if a change in welding conditions occurs.Laser penetration welding monitoring system 1The measuring portion 8 for measuring the light intensity l of light generated from at least one of the melting portion 13 and the plume 18 when the laser 3 is irradiated to the object 2 to be welded is welded to the objectA change point detector 27 for detecting a change point C from which the light intensity l measured at the start of welding changes from the ascending to the descent, andA penetration judging portion 28 is provided which determines that the laser 3 has passed through the object 2 when the change point C is detected.Diagram