Characteristics of Nanoscale Active Oxide in Enhancing Penetration Capability of Surfactant Flux Assisted TIG Welding
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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Document Type: Research Article
Affiliations: Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
Publication date: 01 March 2017
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