Carbides formation in weld metal produced by recycling of titanium machining swarf

Fagundes, J. G.; Ventrella, Vicente Afonso; Gallego, Juno; Moreno, Amália; Jácome, José Leonardo; Bracarense, Alexandre Queiróz

doi:10.1088/1742-6596/1386/1/012046

Cited by 1 publication

(2 citation statements)

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“…In this present study, regions of highest volumetric fraction of carbide presented a similar morphology with those by addition of FeSiMn, indicating that the amount of titanium and carbon which forms TiC can affect carbide morphology. Studies that obtained higher values of carbide volume fraction (above 30%) have a morphology with dendritic and rounded aspects [10,12]. Such comparisons suggest that titanium content is one of the main factors affecting titanium carbide morphology.…”

Section: Resultsmentioning

confidence: 94%

“…Literature reports many works by the application of commercial titanium powders as a ferrotitanium or oxides used as a flux for welding processes [6,9,10]. Recently, titanium chips have been applied as a flux of welding processes as an addition metal for gas tungsten arc welding (GTAW) and metal cored arc welding (MCAW) [11][12][13]. Aspects as a morphology and weld microstructure pointed out similar behavior, comparing to commercial powders.…”

Section: Introductionmentioning

confidence: 98%

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Effects of TiC formation in situ by applying titanium chips and other ingredients as a flux of tubular wire

Júnior

Cardoso

Bracarense

2020

J Braz. Soc. Mech. Sci. Eng.

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Possibility of a varied flux formulation, associated with high deposition rates, has been an advantage in welding processes by applying tubular wires, especially metal cored arc welding (MCAW), characterized by metallic powders in the flux. However, the presence of an exclusively metallic flux may not establish optimal welding conditions, requiring the addition of other ingredients in the flux. The present paper investigates the welding of tubular wire with titanium alloy chips as the flux and the effects of additional elements TiO 2 , CaCO 3 and CaF 2 on the arc behavior such as stability, transfer mode and weld properties. Microstructure was examined by scanning electron microscopy (SEM), and hardness was evaluated by a Vickers microdurometer. The results indicated that the fluxes promoted a characteristic of mixed transfer by short circuiting and globular while the CaCO 3 only promoted characteristics of a globular transfer. Fluxes containing TiO 2 , generally used as an arc stabilizer, showed high levels of disturbance. Despite varying chemical composition of the tubular wire, X-ray diffraction results and images generated SEM, revealed a microstructure replete of faceted TiC for all conditions. Carbide showed no significant differences in morphology. Electrical signals demonstrated considerable effects in transfer mode for each condition. As a consequence of the effects generated by the flux, the properties of the welds were also significantly affected. Hardness variation was improved from 2 to 5 times comparing to the hardness of steel plate.

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Section: Resultsmentioning

confidence: 94%