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Etude et développement des flux solides en vue d'application en soudage ATIG appliqué au titane et ses alliages ainsi qu'aux aciers inoxydables

Abstract : Gas Tungsten Arc Welding uses an electric arc between the refractory tungsten electrode and the plates to be welded under an argon shielding gas. As a result, the joint quality is excellent, no pollution nor defects are to be feared, consequently this process is used in nuclear, aeronautic, chemical and food industries.
Despite of this good qualities, GTAW is limited because of, on the one side, a poor penetrating weld pool and, on the other side, a week productivity rate. Indeed, up to 3mm thick plates, machining and filler metal is needed. Multiple runs increase the defect's risks, the manufactory time and increase the deformations and the heat affected zone.

The goal of this study is to break through this limits without any device investment. Active GTA welding (or ATIG) is a new technique with GTA device and an activating flux to be spread on the upper plate before welding. The arc, by plasma electrochemical equilibrium modifications, and the pool with the inner connective flows inversion, allow 7mm thick joints in one run without edges machining or filler metal for both stainless steel and titanium alloys.

This manuscript describes the development of these fluxes, highlights the several phenomena and presents the possibilities of this new process.
This work, in collaboration with B.S.L. industries, leads to two flux formulations (stainless steel and titanium alloys) now in a commercial phase with CASTOLIN S.A. Moreover, B.S.L.industries produces a pressure device (nitrate column) with the ATIG process using more than 2800 ATIG welds.
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https://tel.archives-ouvertes.fr/tel-00003487
Contributor : Nicolas Perry <>
Submitted on : Monday, October 6, 2003 - 10:50:14 AM
Last modification on : Friday, March 6, 2020 - 10:18:07 PM
Long-term archiving on: : Friday, April 2, 2010 - 6:52:20 PM

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Nicolas Perry. Etude et développement des flux solides en vue d'application en soudage ATIG appliqué au titane et ses alliages ainsi qu'aux aciers inoxydables. Autre. Ecole Centrale de Nantes (ECN), 2000. Français. ⟨tel-00003487⟩

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