Addition of TiO₂, CaCO₃ and CaF₂ as a Flux of Tubular Wire Applied for TiC In-situ Reaction

Abstract:

Versatility of welding processes is mainly attributed to a variety of possible elements used in fluxes formulations, especially in the processes using tubular wires. However, each flux component is selected by a criterion according to an expected function throughout the process, generating effects on metal transfer, formation and solidification of the melt pool. The present work investigates the welding of MCAW tubular wires with chip titanium alloy and graphite as a main component of the flux aim to react as a titanium carbide and the effects by the addition of TiO₂, CaCO₃ and CaF₂ on the electrical arc behavior, such as stability, operation mode. weld transfer and weld properties. The behavior of the oscillograms and cycles generated from the electrical signals indicates the occurrence of modes transfers between short-circuiting, globular and spray, according to each flux added for each condition under the same welding parameters. Formation of titanium carbides was evidenced under all conditions. However, a weld matrix shows the formation of different phases as a consequence of the effects generated by the flux components.

Key-words:
Titanium chips; Conductivity; Recycling; Metal transfer