Effects of Activating Flux on Weld Bead Geometry of Inconel 718 Alloy TIG Welds

Abstract

The purpose of this work is to investigate the effects of activating fluxes and welding parameter to the penetration and depth-to-width ratio (DWR) of weld bead of Inconel 718 alloy welds in the tungsten inert gas (TIG) welding process. In the activating flux with TIG (A-TIG) welding process, the single-component fluxes used in the initial experiment were SiO₂, NiO, MoO₃, Cr₂O₃, TiO₂, MnO₂, ZnO, and MoS₂. Based on the higher DWR of weld bead, four fluxes were selected to create six new mixtures using 50% of each original flux. The A-TIG weldment coated 50% SiO₂ + 50% MoO₃ flux and 75° of electrode tip angle were provided with better welding performance. In addition, the experimental procedure of flux-bounded TIG (FB-TIG) welding with the same welding conditions and flux produced full penetration of weld bead on a 6.35 mm thickness of Inconel 718 alloy plate with single pass weld.

Keywords:

• Coatings
• Flux
• Geometry
• High-temperature
• Nonferrous
• Optimization
• Weldability
• Welding