Effects of flux precoating and process parameter on welding performance of Inconel 718 alloy TIG welds

Hsuan Liang Lin, Tong Min Wu, Ching Min Cheng

Research output: Contribution to journalArticle

11 Citations (Scopus)


The purpose of this study is to investigate the effect of activating flux on the depth-to-width ratio (DWR) and hot cracking susceptibility of Inconel 718 alloy tungsten inert gas (TIG) welds. The Taguchi method is employed to investigate the welding parameters that affect the DWR of weld bead and to achieve optimal conditions in the TIG welds that are coated with activating flux in TIG (A-TIG) process. There are eight single-component fluxes used in the initial experiment to evaluate the penetration capability of A-TIG welds. The experimental results show that the Inconel 718 alloy welds precoated with 50% SiO2 and 50% MoO3 flux were provided with better welding performance such as DWR and hot cracking susceptibility. The experimental procedure of TIG welding process using mixed-component flux and optimal conditions not only produces a significant increase in DWR of weld bead, but also decreases the hot cracking susceptibility of Inconel 718 alloy welds.

Original languageEnglish
Pages (from-to)125-132
Number of pages8
JournalJournal of Materials Engineering and Performance
Issue number1
Publication statusPublished - 2014 Jan



  • Activating flux
  • Hot cracking
  • Inconel 718 alloy
  • TIG welding
  • Welds morphology

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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