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Laser-pulse-induced temperature, thermal stress, and crater morphology effect during multipulse nanosecond laser manufacturing

Qiang Lu, Fake Lu, Xiaoliang He, Zhilong Jiang, Hongyan Lu, Fan Zhu, Cheng Liu, Shouyu Wang, and Yan Kong

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Abstract

We construct a numerical model for multipulse laser drilling. It is found that the previous laser-pulse-induced temperature accumulation, thermal stress occurrence, and crater morphology change promote subsequent pulse laser drilling. Among them, previous laser-pulse-induced temperature accumulation contributes significantly to the drilled crater depth when the workpiece temperature is higher than its melting point just before the subsequent laser pulse irradiation, especially in a short pulse interval condition. The crater morphology change becomes the main contributor when the workpiece temperature decreases below the melting point, often in a long pulse interval condition. Besides, the previous occurrence of laser-pulse-induced thermal stress always has had little influence on the drilled crater. This work can be a theoretical reference, especially for multipulse laser manufacturing.

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