Melt removal mechanism by transverse gas flow during laser irradiation

Cheng-hua Wei; Yong-xiang Zhu; Meng-lian Zhou; Zhi-liang Ma; Tao-tao Wu

doi:10.1117/12.2267060

12 May 2017 Melt removal mechanism by transverse gas flow during laser irradiation

Cheng-hua Wei, Yong-xiang Zhu, Meng-lian Zhou, Zhi-liang Ma, Tao-tao Wu

Proceedings Volume 10173, Fourth International Symposium on Laser Interaction with Matter; 1017303 (2017) https://doi.org/10.1117/12.2267060
Event: 4th International Symposium on Laser Interaction with Matter, 2016, Chengdu, China

Abstract

To determine the mechanism of melt removal by transverse gas flow, a lateral visualization technique of hydrodynamics on melt pool was developed and experimental apparatus were built. The intensity distribution of the focused beam was confirmed to be in top-hat shape with the 15mm×40mm rectangular. The interface of liquid-solid and free surface of molten metal was observed by a high velocity video camera with acquisition rate of 1kHz. Gas flow blew from left to right and the velocity varied from 15m/s to 90m/s to investigate the evolution of hydrodynamics. Experiment results showed that surface wave was generated at the initial stage and molten metal was removed out from the melt pool by shear stress. When some amount molten metal was removed from melt pool, gas flow separated at the leading edge and reattaches downstream of melt pool. Thus a stagnation point was formed at the downstream edge and a recirculation zone was generated on the left side of stagnation. With recirculation gas flow constrain, the molten metal only can be entrained into main stream and then be swept away. The molten material was removed out by shear stress on the right side of stagnation.

Citation Download Citation

Cheng-hua Wei, Yong-xiang Zhu, Meng-lian Zhou, Zhi-liang Ma, and Tao-tao Wu "Melt removal mechanism by transverse gas flow during laser irradiation", Proc. SPIE 10173, Fourth International Symposium on Laser Interaction with Matter, 1017303 (12 May 2017); https://doi.org/10.1117/12.2267060

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