Weld shape and microstructure of TC4 laser welding with activating flux of Na<sub>2</sub>SiF<sub>6</sub>

HOU Jijun; DONG Junhui; BAI Xueyu; HAN Xu; YANG Hu

doi:10.12073/j.hjxb.2019400265

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2019 > 40(10): 67-72. > DOI: 10.12073/j.hjxb.2019400265

HOU Jijun, DONG Junhui, BAI Xueyu, HAN Xu, YANG Hu. Weld shape and microstructure of TC4 laser welding with activating flux of Na₂SiF₆[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(10): 67-72. DOI: 10.12073/j.hjxb.2019400265

Citation:

Weld shape and microstructure of TC4 laser welding with activating flux of Na₂SiF₆

1.
Inner Mongolia University of Technology, Hohhot 010051, China
2.
Ulanqab Bureau of Industry and Information Technology, Ulanqab 012000, China

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Received Date: April 07, 2019
Available Online: July 12, 2020

Graphical Abstract

Abstract

Abstract

Na₂SiF₆ was used as surface activating flux for laser welding of TC4 titanium alloy. The effect of Na₂SiF₆ on TC4 titanium alloy laser welding was determined by observing the weld surface. The morphological characteristics of the high temperature plasma above the workpiece was observed and analyzed by using high-speed digital camera system. The variation of weld depth,width and microstructure were analyzed by optical microscope. The experimental results show that laser weld of TC4 titanium alloy has good appearance with activating flux of Na₂SiF₆, weld penetration increases by about 0.8% ~ 12%, while weld surface width decrease by about 10% ~ 29%, the depth to width ratio is effectively improved. The inhomogeneity of weld microstructure was improved , and the crystallization direction of βcolumnar crystals on the upper part of the weld was changed, the grain size and microstructure of the weld were refined by Na₂SiF₆.
- Na₂SiF₆,
- TC4 titanium alloy,
- plasma,
- weld shape,
- microstructure

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References (14)

References

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Weld shape and microstructure of TC4 laser welding with activating flux of Na₂SiF₆