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Comparisons between TiO2- and SiO2-flux assisted TIG welding processes
Kuang-Hung Tseng1, Kuan-Lung Chen
1Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan.
Journal of Nanoscience and Nanotechnology
|September 12, 2012
Summary
Flux compounds like TiO2 and SiO2 significantly enhance tungsten inert gas (TIG) welding of stainless steel. SiO2 flux offers superior penetration and energy density compared to TiO2, improving weld quality.
Area of Science:
- Materials Science and Engineering
- Metallurgy
- Welding Technology
Background:
- Austenitic 316 L stainless steel is widely used in demanding applications.
- Tungsten inert gas (TIG) welding is a critical joining process for stainless steels.
- Flux-assisted TIG welding can enhance weld characteristics but requires optimization.
Purpose of the Study:
- To investigate the impact of TiO2 and SiO2 flux powders on TIG weld properties.
- To evaluate the effects on weld shape, ferrite content, and hardness profile.
- To compare the penetration capabilities and energy density of different fluxes.
Main Methods:
- Tungsten inert gas (TIG) welding of 6 mm-thick 316 L stainless steel plates.
- Utilized TiO2 and SiO2 powders as activated fluxes.
- Metallurgical characterization using ferritoscope, optical microscopy, and Vickers microhardness testing.
Main Results:
- SiO2 flux achieved approximately 292% penetration, significantly higher than TiO2's 240%.
- SiO2 flux resulted in a more constricted plasma column and condensed anode root.
- Energy density was higher for SiO2-flux assisted TIG welding compared to TiO2.
Conclusions:
- Flux compounds, specifically SiO2, can substantially improve TIG welding performance in 316 L stainless steel.
- SiO2 flux enhances penetration and energy transfer, leading to potentially superior weld characteristics.
- Further research into flux-enhanced TIG welding can optimize material joining processes.