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Characteristics of Nanoscale Active Oxide in Enhancing Penetration Capability of Surfactant Flux Assisted TIG Welding

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The penetration capability (PC) of different TiO2 particle size assisted TIG welding of UNS S17400 stainless steel was investigated. Microscale TiO2 (MST) and nanoscale TiO2 (NST) powders mixed with pure water (100% W), pure acetone (100% A), or a water/acetone (W/A) solvent were used as the surfactant flux (SF). The role of a nanoscale active oxide in enhancing the PC of the SF assisted TIG (TIG-SF) welding of stainless steel is also demonstrated. The results show that NST powder requires a significantly greater amount of solvent to create a paste-like SF compared to MST powder. The 80% W/20% A ratio was the preferred solvent for mixing both the MST and NST powders. During NST flux assisted TIG welding of UNS S17400 stainless steel, an electrical insulation bond (EIB) was more easily formed and sufficient oxygen concentration (OC) was also more quickly obtained. Consequently, the use of NST ingredient could further enhance the PC of the TIG-SF welding of UNS S17400 stainless steel, as compared to the use of MST ingredient. This study proposes that the oxide used in the TIG-SF welding of stainless steels must have three key features: a high electrical resistance, low thermal stability, and small particle size.
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Keywords: Microscale TiO2; Nanoscale TiO2; Penetration Capability; Surfactant Flux; TIG Welding

Document Type: Research Article

Affiliations: Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan

Publication date: 2017-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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