On the Development of a New Flux Bounded TIG Process (FBTIG) to Enhance Weld Penetrations in Aluminium 5086
The paper describes a new approach for enhancing the penetration potential of TIG welding process for an aluminium-magnesium 5086 alloy. The new technique, called FBTIG (Flux Bounded TIG), uses the electric resistance of silica and its capacity to form negative ion species in the arc, to channel electrons favourable for enhancing the weld penetration. It is now possible to weld 6 mm thick plates in one single run, with alternative current while preserving weld cosmetics expected in AC mode welding. It is suggested that the silica flux confines the arc to the narrow metal strip surrounding the joint. The arc confinement increases the power density and results in increased weld penetrations.
Stéphane SIRE, Maria SURENDAR
Reçu le 24 juillet 2001.
Accepté le 15 janvier 2002.
TIG, FBTIG, Silica, Arc, Aluminium, Welding.