Banca de QUALIFICAÇÃO: DEUSDEDIT CARLOS DA SILVA JUNIOR

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : DEUSDEDIT CARLOS DA SILVA JUNIOR
DATE: 07/02/2022
LOCAL: Sala Virtual do PPGEM
TITLE:

IMPLEMENTATION OF COLD WIRE TANDEM SUBMERGED ARC WELDING TECHNOLOGY TO JOINING COARSE THICKNESS PLATES

KEY WORDS:

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

PAGES: 89
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

Companies are currently looking for welding processes that promote high productivity. Within this challenge, there is still the need to restrict distortions in parts of great thickness to maintain dimensional control of the welded components, which is an almost inevitable constant. With this scenario, ICE submerged arc welding (SAW) shows its efficiency, where traditionally, conventional submerged arc welding is used aiming at a higher deposition rate and reduction of manufacturing times and costs. The SAW-ICE (Integrated Cold Electrode) process is characterized by a modified twin torch where two wires work energized, and the heat of the process melts a third integrated cold wire. This technique allows an increase in the deposition rate and a considerable reduction in heat input and distortions. This work aims to develop a comparative analysis of productivity –with constant and controlled heat input– and the level of distortions between conventional SAW and ICE welding in a typical industry joint. Four 40 mm thick ASTM A36 steel specimens were made with a butt joint, double groove welding, double U bevel, and 5 mm of root opening. The first two specimens were welded with a bevel angle of 40° and the last two with an optimized angle of 16°. For one side (A) of all joints, the welding process used was GMAW to simulate real manufacturing conditions. The maximum heat input for the conventional submerged arc beads and ICE (side B) was 2.7 kJ/mm for all joints. For productivity evaluation, open arc times, deposition rates, and the number of passes were determined. For characterization of the joints, macrographs, tensile, bending, impact tests, and distortion analysis of the plates was performed. The results obtained showed that the SAW-ICE welding presented superior productivity compared to the conventional SAW process for the same heat input range. From the mechanical point of view, all experiments were satisfactory according to the criteria of the AWS standard. The specimens welded by SAW-ICE showed a significantly lower level of distortion when compared to the distortions obtained by the conventional SAW process. Therefore, it is possible to conclude that ICE submerged arc welding promotes a significant increase in productivity and reduction of distortions in sheets of great thickness while still maintaining the mechanical properties suitable for the project.

BANKING MEMBERS:
Presidente - 2154866 - TIAGO FELIPE DE ABREU SANTOS
Interno - 2296912 - OSCAR OLIMPIO DE ARAUJO FILHO
Externo à Instituição - RODRIGO SANCES DE OLIVEIRA - PUCMinas
Externo à Instituição - EDWAR ANDRÉS TORRES LÓPEZ