The Use of Rare Earth Fluorides as Flux Components in Tig Welding of Titanium

Keywords

titanium alloy VT-22, TIG welding, flux-cored wire, rare earth fluorides

Abstract

The paper presents the results of investigations of the influence of rare-earth metal fluorides on structural changes in weld metal of titanium alloy VT22 for the purpose of using them in the flux filler of experimental flux-cored wire for welding this alloy. It was shown that refinement of β-grains is observed in welds made by argon-arc welding of VT22 alloy over a layer of flux, consisting of rare-earth metal fluorides. Addition of LaF3 to the core of experimental flux cored titanium wire PPT-22 in combination with heat treatment allowed increasing the impact toughness of welds in argon-arc welding of VT22 alloy 2 times up to 30.6 J/cm2.

References

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