Laser welding quality evaluation apparatus, laser welding apparatus and method

摘要

PPROBLEM TO BE SOLVED: To improve evaluation accuracy in an apparatus which evaluates the quality of a laser welding on the basis of the detection signal of an AE (acoustic emission) sensor. PSOLUTION: A pressure roller 20 presses around the weld zone 32 of objects to be welded 30 to thereby bring the objects to be welded 30 into close contact with each other, and improves welding efficiency. An AE sensor 22 is provided in a shaft supporting part 18 which supports the rotary shaft of the pressure roller 20. An AE wave produced in the weld zone 32 propagates the pressure roller 20 and the shaft supporting part 18, and is detected with the AE sensor 22. The attenuation of the AE wave decreases and the S/N ratio of the detection signal of the AE sensor 22 improves, because an airspace is not inserted on the way. A detection is always performed on a fixed conditions, because the AE sensor 22 always exists in a fixed positional relationship to the weld zone 32. PCOPYRIGHT: (C)2004,JPO