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Objective: The objective of this study is to analyze the electric arc signals in pulsed cored wire surfacing welding with SAE 1020 base metal and AWS EC410NiMo MC filler metal. Theoretical Framework: Fluxed Cored Arc Welding (FCAW) a process where fusion produced by an established between workpiece consumable protection molten pool gas. Method: tests were performed some fixed test parameters such as: flat position, electrode polarity (CCEP), torch position (90º), shielding gas (Ar + 2% O2)...

The low carbon martensitic stainless AWS 410NiMo steel has in its chemical composition 13% chromium, 4% nickel, and 0.4% molybdenum (wt.%) is used turbine recovery, rotors, high-pressure steam pump housings due to resistance impact at temperatures, as well corrosion cavitation. Those applications of the frequently demand repair, which performed by welding or cladding. Arc a well-established technique for joining materials presents several parameters that influence mechanical performance weld...

In the execution of a welding process, there are large number variables that need to be adjusted by operator/welder improve stability process. The quality process is closely linked has been carried out. this work, coating in pulsed direct current with Gas-Shielded Flux Cored Arc Welding (FCAW-G) was used, having SAE 1020 steel as base metal and martensitic stainless 410NiMo 1.2 mm diameter additional metal. Current voltage data were analysed verify, using computational tools Vilarinho...

Current study evaluated the machinability characteristics of parts, microstructure and mechanical properties when three different inoculants (IM-22 with FeSi-Ba/Zr; G-20 FeSi-Ba; IMSR 75 FeSi-Sr) were added in experiments carried out a foundry. The research methodology was mailly based on analysis by milling process specimens gray cast iron GG-25, name according to DIN EN 1561.Evaluation results is thorough tool wear, surface finish, microstructural analysis, chemical composition material....

This article describes an innovative application of hardfacing using Gas Tungsten Arc Welding (GTAW) process with alloys in powder form incorporated directly into the weld puddle. Stellite 6 alloy was used on substrate SAE 1020 steel mainly due to wear resistance. The good resistance is characteristics Co-Cr carbide dispersed a matrix deposited. Vickers hardness data, deposition rate, dilution, optical micrograph and Scanning Electron Microscopy (SEM) corresponding EDS spectra...

ABSTRACT This work deals with the application of J ‐integral estimation method to cracked riveted beams old puddle iron. The ductility some these materials makes it necessary use elasto‐plastic fracture criteria assess damage tolerance. requires a high computational effort because involves determination in plates and angles that interact by means redundant forces dependent on crack size. proposed Electric Power Research Institute could reduce this provided were shown be valid for type beam....

Duplex stainless steels were aged at low temperatures (∼ 400°C) for a long time (2000–5000 hours). Optical microscopy does not show any differences in the microstructure, but corrosion resistance is very affected by heat treatment, despite fact that polarization curves are similar all analyzed samples; weight loss measured immersion test indicates an increase rate as function of temperature and time. Pitting potentials, potentiostatic method, pitting susceptibility greater when treatment...

Duplex stainless steel samples were aged at low temperatures of the 300°C and 400°C for 3000, 5000 7000 hours. The changes micro-structure followed during annealing time using an optical microscopy measurements phase percentages. Nano-hardness was used in order to identify responsible increasing global hardness. G precipitation a’phase due spinodal decomposition identified by transmission electron microscopy. It detected that micro-structural affect properties, remarkably TEM results showed...

The PREN value of the alloy may lead to a misleading prediction pitting corrosion resistance because in event an imbalance δ ferrite and austenite volume fraction, by Quantitative metallographic analyzes. In this work three laminated duplex stainless steels with different PRENs were characterized: UNS S32304 (Lean Duplex), S31803 (Duplex) S32750 (Super where several techniques microstructural analysis used, such as optical emission spectrometry, microscopy scanning electron microscopy/EDS....

This paper presented the main objective characterization of cracks in welded joints ferritic steels, since these are considered one most serious types discontinuities welds steels.These formed when tensile stresses developed a fragile material, unable to plastically deform absorbing it.High created and weld region as result thermal expansion contractions located ( associated with non-uniform heating ), volume changes due phase transformations links between pieces being rest structure.To...

This study was based on the combination of simple and quick techniques to substitute conventional manufacturing system assembly metal truss connected by wood structures for free environments less movement. Although in its use, bolted connections are extremely complex their analysis behavior. The evaluating wood/wood with a divider interface connections, just observe strength set's performance under real loads support coming from roof elements work. Load tests evaluate shear behavior...

Este estudo propõe a análise estatística de soldas revestimento utilizando processo soldagem com arame tubular e corrente contínua pulsada (P-FCAW), variância para analisar eficácia modelo regressão primeira ordem relacionar os valores obtidos média, tensão potência largura reforço. Corpos prova aço SAE 1020 foram usados receber cordões metálico em inoxidável martensítico 410 NiMo. Alguns parâmetros mantidos constantes como composição do gás vazão, quantidade cordões, pico tempo entre...

The cladding welding analysis with pulsed flux cored arc (FCAW) process, were carried over a AISI 1020 base metal (thickness 12,7 mm, width 63,5 and length 185mm) an CA6NM steel wire diameter of 1.2mm.Was performed only one weld cord in the flat position.For experimental design was used method Taguchi L9 to determinate parameter be analyzed through application variance (ANOVA) method.The response signals RMS (Root Mean Square) voltage, current acceleration.The procedure is based on...

This article describes computerized traction testing through the ANSYS software in aircraft materials, aluminum 7075-T6, which leads to variations of strength limits with stress concentration factor rivet cavity.However, was performed a change radius transition from head body order alleviate concentrations within bore and improve part by 5.25% no relevant displacement.The fatigue limit higher samples without burr operation, observing that geometric trunk section generated decrease 18.27%...

Resumo Este trabalho foi desenvolvido visando auxiliar os profissionais de soldagem quanto as incertezas relacionadas às atividades fabricação, montagem e manutenção tubulações em plantas industriais no qual se refere à maneira adequada para a condução qualificação procedimentos soldagem. Discorre sobre metodologia conforme parâmetros dos códigos ASME B31.3 (Tubulação Processos), trabalhos executados processos BPV Code SECTION IX (Qualificação Soldagem, Brasagem Fusão), norma largamente...

Abstract: This study aimed to analyze and optimize deposition welding parameters using a pulsed tubular wire process (FCAW - Flux Cored Arc Welding), where the influence variables adopted were average current, pulsation frequency, speed contact-tip-workpiece distance, with each variable being tested at three different levels. The geometric characteristics evaluated, that is, response variables, are width, reinforcement, penetration, reinforcement area, penetration area dilution. distance In...