28 documents found, page 1 of 3
Estudo de procedimentos de soldagem MIG/MAG para aplicação de revestimentos de ...
Cavalcante, Nathália Escóssio; Andrade, Tathiane Caminha; Pinheiro, Pedro Helton Magalhães; Miranda, Hélio Cordeiro de; Motta, Marcelo FerreiraThis work aims to study welding techniques applied to repair of components made of ASTM A387 Gr.11 steel, widely used in the oil and gas industry. Due to the working conditions it is needed use materials having good strength and corrosion resistance. UNS N06625 Ni-based alloy (Inconel 625) was used as the filler metal. MIG / MAG welding process was used to apply the temper bead welding technique with two layers...
Estudo dos efeitos da restrição na microestrutura, microdureza e tenacidade em ...
Nunes, Everton Barbosa; Motta, Marcelo Ferreira; Abreu, Hamilton Ferreira Gomes de; Farias, Jesualdo Pereira; Miranda, Hélio Cordeiro deDuplex stainless steels present ferrite and austenite in their microstructure in order to join good mechanical properties and corrosion resistance. These materials are very used in petrochemical industry, being the DSS UNS S31803 one of the most commercially known. There were not much published literature to study the influence of the precipitation of Widmanstätten austenite in joins with some restriction. This...
Avaliação do efeito da energia de soldagem sobre as tensões residuais resultant...
Oliveira, George Luiz Gomes de; Silva, Thiago Ferreira da; Miranda, Hélio Cordeiro de; Motta, Marcelo FerreiraThe energy input in welding can be adjusted by either control of welding power (voltage and welding current) or welding speed. These different ways of changing can result in different residual stress profiles in the welded joint. Then, the aim of this work is to evaluate, in an independent way, the welding energy input, current and speed effect on the final residual stresses of a multipass joint. Semi-v chamfer...
Avaliação do efeito da energia de soldagem na deposição de aço inoxidável super...
Nunes, Everton Barbosa; Cavalcante, Nathália Escóssio; Barreto, Alexandre Sousa; Silva, Antônio Ítalo Neves da; Motta, Marcelo FerreiraThe powder plasma process is one of the latest on weld overlay application and it has as main feature getting the dilution control. The weld overlay with the Super Duplex Stainless Steels is an interesting alternative for the construction and repair of equipment for applications in severe corrosive medium corrosion, allowing reach the desirable characteristics: good resistance corrosion and mechanical propertie...
Creating in-situ alloys by welding - new perspectives for advanced materials an...
Motta, Marcelo Ferreira; Santiago, Kamilla Giló; Pessoa, Edson Frota; Rodrigues, Ana C.; Fernandes, Igor PaulinoThe present study discusses the use of the Tandem GMAW process as a technology capable of postponement manufacturing in the production of specific alloys, using different commercially available alloys. The results show that the Tandem GMAW process can be successful applied to produce in-situ alloys for specific purposes by combining different alloys during the welding procedure, leading to advances in the manuf...
Intergranular corrosion evaluation of friction stir welded AISI 410S ferritic s...
Caetano, Gerbson de Queiroz; Silva, Cleiton Carvalho; Motta, Marcelo Ferreira; Farias, Jesualdo Pereira; Bergmann, Luciano Andrei; Santos, Jorge F. dosThis study aimed to investigate the susceptibility of AISI 410S ferritic stainless steel to intergranular corrosion when friction stir welded (FSW) using the double-loop electrochemical potentiokinetic reactivation (DL-EPR) test. The highest values obtained for the ratio between the reactivation current (Ir) and the activation current (Ia) were found at the top of the advancing side for the two conditions teste...
Influence of rotation speed and axial force on the friction stir welding of AIS...
Caetano, Gerbson de Queiroz; Silva, Cleiton Carvalho; Motta, Marcelo Ferreira; Miranda, Hélio Cordeiro de; Farias, Jesualdo PereiraThe Friction Stir Welding process parameters were varied to provide a combination of an acceptable surface finish, absence of cracks, and full tool penetration. Two levels of rotation speed and axial forces from 10 to 30 kN were applied, whilst keeping the welding speed constant at 1 mm/s. One of the defects analyzed was the production of flashes. This can occur due to an increase in axial force and because of ...
Influência da defasagem entre as correntes na estabilidade do processo MIG/MAG ...
Santiago, Kamilla Giló; Fernandes, Igor Paulino; Miranda, Hélio Cordeiro de; Silva, Cleiton Carvalho; Motta, Marcelo FerreiraOne of the possibilities of variation of the Tandem GMAW process is the use of out-of -phase current pulse, with the aim of giving greater stability to the voltaic arcs. In some works available in the literature, the authors found results that showed that this effect of out-of -phase current pulse was not significant. Another aspect that is also widely defended in pulsed GMAW welding is the condition of a drop ...
Electron detection modes comparison for quantification of secondary phases of I...
Miná, Émerson Mendonça; Silva, Yuri Cruz da; Motta, Marcelo Ferreira; Miranda, Hélio Cordeiro de; Dille, Jean; Silva, Cleiton CarvalhoQuantitative analyses produce important information concerning the microstructural characteristics of materials, which are reflected in the main properties of the materials. The secondary and backscattered electron modes represent the two main techniques most used in scanning electron microscopy, to produce images and, consequently, realize a quantitative analysis. However, each technique has its advantages and...
Assessment of microstructure of alloy Inconel 686 dissimilar weld claddings
Silva, Cleiton C.; Afonso, Conrado Ramos Moreira; Ramirez, Antonio Jose; Motta, Marcelo Ferreira; Miranda, Hélio Cordeiro de; Farias, Jesualdo PereiraWeld overlay with Ni-based superalloys is an important option for industrial applications. New alloys have been developed to assure desirable characteristics such as corrosion resistance. The Inconel 686 superalloy was developed with a higher Cr and Mo content in order to improve its resistance to corrosion. However, information in the literature about the solidification and weld microstructure of this alloy is...