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23-08-2016 | Issue 11/2016

Metallurgical and Materials Transactions A 11/2016

Effects of Cr2O3 Activating Flux on the Plasma Plume in Pulsed Laser Welding

Journal:
Metallurgical and Materials Transactions A > Issue 11/2016
Authors:
Luo Yi, Du Yunfei, Xie Xiaojian, Wan Rui, Zhu Liang, Han Jingtao
Important notes
Manuscript submitted February 11, 2016.

Abstract

The effects of Cr2O3 activating flux on pulsed YAG laser welding of stainless steel and, particularly, on the behavior of the plasma plume in the welding process were investigated. According to the acoustic emission (AE) signals detected in the welding process, the possible mechanism for the improvement in penetration depth was discussed. The results indicated that the AE signals detected in the welding process reflected the behavior of the plasma plume as pulsed laser energy affecting the molten pool. The root-mean-square (RMS) waveform, AE count, and power spectrum of AE signals were three effective means to characterize the behavior of the plasma plume, which indicated the characteristics of energy released by the plasma plume. The activating flux affected by the laser beam helped to increase the duration and intensity of energy released by the plasma plume, which improved the recoil force and thermal effect transferred from the plasma plume to the molten pool. These results were the main mechanism for Cr2O3 activating flux addition improving the penetration depth in pulsed YAG laser welding.

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