Deposição por plasma com arco transferido

Díaz, Víctor Vergara; Dutra, Jair Carlos; ́Oliveira, Ana Sofia Clímaco Monteiro D

doi:10.1590/s0104-92242010000100006

Cited by 7 publications

(1 citation statement)

References 4 publications

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“…Outro processo de soldagem muito pesquisado e aos poucos introduzido no reparo de turbinas em campo é o PTA (Plasma a Arco Transferido). Este tem um grande potencial comparado a outros processos devido à elevada produtividade, excelente qualidade do depósito, alta estabilidade do plasma, baixa diluição bem como maior exibilidade na formulação de ligas [13].…”

Section: Objetivosunclassified

Água como tema CTS no ensino médio : uma proposição

Barbosa¹

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This work presents a study on the bead deposition planning strategy in order to allow the use of robotic welding on the task of lling the crack removal cavity. Therefore, when thinking about dening the necessary sequence and the distribution of weld beads to ll the cavity with metal, such that the deposition process can be robotized, some problems arise related to the bead section geometry dependence on the welding parameters and on the welding position. Such geometry will strongly inuence the number of layers of weld beads needed, considering that the lling process is carried out in layers. In this case, the rst problem to be faced is the denition of the distance between parallel beads necessary for the deposition of a at weld layer. The second problem is the layer thickness that results from the selected distance between parallel beads within a layer. This work, therefore, addresses the two previously cited problems by developing statistical models that can map the bead section geometry variations due to changes in welding parameters for the pulsed GMAW process. Then this methodology denes the strategy to determine the trajectory of weld beads of each layer in order to perform the geometric evaluation of the recovery and quality of the lling. Practical results of geometric point of view of the strategy of lling, applied to a cavity such as the one resulting from the removal of a crack are presented in order to validate the proposed methodology.

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Section: Objetivosunclassified

Água como tema CTS no ensino médio : uma proposição

Barbosa¹

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Evaluation of solidification cracking of Ni-based alloy dissimilar welds based on Trans-Varestraint test

et al. 2021

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This study aims to evaluate the weldability of dissimilar welds with the Inconel 625 and the Hastelloy C-276 nickel-based alloys deposited on ASTM A36 and AISI 1045 carbon steel plates. The welds were carried out by the GMAW process and evaluated by the Trans-Varestraint test. The test results were statistically evaluated, and Fusion Zone solidification processes were simulated in JMatPro software using several dilution levels. The analysis of variance (ANOVA) test results showed that the two different base metals did not affect the weldability of Inconel 625. However, the Hastelloy C-276 alloy showed a significant drop in weldability with the AISI 1045 steel compared to the ASTM A36. The results of the Hastelloy C-276 as the filler metal and the AISI 1045 steel as the base metal showed greater susceptibility to solidification cracking than all the other pairs tested, according to the Trans-Varestraint test. Moreover, the ANOVA test results indicated that the different heat input levels did not influence the sets' weldability; this was probably because there was only a tiny variation in the dilution levels. The solidification process simulation indicates that higher dilution levels promote the precipitation of a larger secondary phase fraction.

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