Banca de QUALIFICAÇÃO: DEUSDEDIT CARLOS DA SILVA JUNIOR

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : DEUSDEDIT CARLOS DA SILVA JUNIOR
DATE: 31/10/2023
LOCAL: Qualificação por videoconferência
TITLE:

IMPLEMENTATION OF TANDEM AND TANDEM-TWIN TECHNIQUES WITH COLD WIRE FOR WELDING WIND TOWERS

KEY WORDS:

SAW, Number of passes, Insulated wire, Productivity, Heat input, Microstructure.

PAGES: 66
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

Wind energy represents a significant category of power generation, originating from the conversion of the kinetic energy of the wind into electricity. This process is facilitated through wind turbines, located at the top of wind towers, which capture the kinetic energy of the wind and direct it to an electrical generator responsible for its conversion into electrical energy. In addition to its abundance, wind energy is a renewable source that can be accessed in various regions of the world. It is important to note that these towers can be installed in both terrestrial and maritime areas, provided they are situated in locations with consistent and vigorous winds. The process of constructing wind towers involves their fabrication in industrial facilities, with specialists developing specific designs, especially for metallic towers, which typically consist of tubes. These tubes are transported to the wind farm site, where they are assembled. This procedure ensures the stability and effectiveness of the towers in capturing the winds. A notable advancement in wind tower technology is the ability to construct taller structures. Currently, most wind towers have heights ranging from 80 to 120 meters. These towers are predominantly constructed using steel and concrete, and many of them reach an average height of 110 to 130 meters. This increased height enables the capture of stronger and more consistent winds, resulting in greater energy generation efficiency. In the field of welding used in the construction of wind towers, the pursuit of high productivity is constant for companies. However, it is crucial to control distortions in thick parts to maintain the dimensional integrity of the welded components. Submerged Arc Welding with Integrated Cold Electrode (SAW-ICE) has stood out for its efficiency. This process involves a modified twin torch, where two wires are energized, while a third integrated cold wire is melted by the heat of the process. This leads to higher deposition rates and a reduction in heat input, minimizing distortions in the parts. The primary objective of this study is to conduct a comparative analysis of productivity while varying the welding speed and controlling heat input, simultaneously evaluating distortion levels between SAW and ICE welding processes. Additionally, as an extension of my already completed master's thesis, a more in-depth analysis of the microstructural properties of welded joints is being carried out, including the measurement of Acicular Ferrite content in the structure. The effects of corrosion are also being investigated, particularly considering the coastal environment in which these structures are deployed. The correlation between mechanical properties, corrosion, and the impact on the microstructure of welded joints is being meticulously examined as part of this academic study.

COMMITTEE MEMBERS:
Presidente - 2154866 - TIAGO FELIPE DE ABREU SANTOS
Interno - 2296912 - OSCAR OLIMPIO DE ARAUJO FILHO
Externo à Instituição - RONALDO CARDOSO JUNIOR