Method and device for simultaneously detecting elements, defects and residual stress
A technology of residual stress and elements, which is applied in the field of laser material detection, achieves the effect of wide application prospects and simple sample preparation
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[0071] Now take the detection of arc additive manufacturing samples as an example to illustrate the use process of the laser photoacoustic composite detection system of the present invention. The specific operation steps are as follows:
[0072] (1) The pulsed laser 6 is a Nd:YAG Q-switched laser with an emission wavelength of 532 nm, a pulse width of 8 ns, and an adjusted pulse energy of about 50 mJ. The ultrasonic detector 3 uses a water-immersed ultrasonic probe with a center frequency of 20MHz. The digital delay generator 5 model is DG535, and its delay resolution is 5ps.
[0073] (2) The welding sample is placed on the sample holder 15 . The scanning surface faces the laser light outlet, adjust the position of the 3D displacement platform 4 in the Y-axis direction and the position of the focusing objective lens 14, so that the pulsed laser beam is focused on the focus position; adjust the position of the high-precision 3D displacement platform 4 on the X-Z axis to the po...
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