Weld formation and microstructure properties in laser welding of TC4 titanium alloy with activating fluxes of oxides and chlorides

Jijun HOU, Junhui DONG, Xiaofang WU

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Journal of Materials Engineering ›› 2025, Vol. 53 ›› Issue (6) : 136-144. DOI: 10.11868/j.issn.1001-4381.2023.000328
RESEARCH ARTICLE

Weld formation and microstructure properties in laser welding of TC4 titanium alloy with activating fluxes of oxides and chlorides

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Abstract

SiO2， TiO2， NaCl， and KCl are chosen as activating fluxes for laser welding of 5 mm thick TC4 titanium alloy to increase the laser absorptivity of base material and improve weld formation. Based on the influence of activating fluxes on weld formation， the mechanism of action of activating fluxes and their impact on the microstructure and properties of welded joints are analyzed. The experimental results show that the activating fluxes have no significant effect on the macro formation of the weld， and the four activating fluxes can affect the shape size of the weld by increasing the laser absorptivity related to welding heat input. Besides， SiO2 mainly reduces the absorption and scattering of laser beam by reducing photoinduced plasma， and TiO2 primarily reflects and propagates laser beam among the fine particles， NaCl and KCl have both. The tensile strength of the joint coated with SiO2 and TiO2 has descended by 14% and 10% respectively. It is related to the change of weld microstructure by activating fluxes. The tensile properties of the welded joints coated with NaCl and KCl are not lower than that of uncoated welded joints. They can be used as an effective activating flux for TC4 titanium alloy laser welding.

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active laser welding / TC4 titanium alloy / weld formation / microstructure property

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Jijun HOU , Junhui DONG , Xiaofang WU. Weld formation and microstructure properties in laser welding of TC4 titanium alloy with activating fluxes of oxides and chlorides. Journal of Materials Engineering. 2025, 53(6): 136-144 https://doi.org/10.11868/j.issn.1001-4381.2023.000328

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