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Zaitov O.,Belgian Welding Institute | Kolchuzhin V.A.,TU Chemnitz
Journal of Manufacturing Processes | Year: 2014

Electromagnetic pulse metal processing techniques (EPMPT) such as welding, forming and cutting have proven to be an effective solution to specific manufacturing problems. A high pulse magnetic field coil is a critical part of these technologies and its design is a challenging task. This paper describes a Bitter coil design using a newly developed methodology for a simplified analytical calculation of the coil and complementary finite element models (FE) of different complexity. Based on the methodology a Belgian Welding Institute (BWI) Bitter coil has been designed and tested by means of short circuit experiments, impedance and B-field measurements. A good agreement between the calculated and the experimental design parameters was found. © 2014 The Society of Manufacturing Engineers. Source

Martinez-Valle A.,OCAS NV inc | Martinez-Jimenez J.M.,University of Cordoba, Spain | Goes P.,OCAS NV inc | Faes K.,Belgian Welding Institute | De Waele W.,Ghent University
Advanced Materials Research | Year: 2011

This paper presents the development process of a fully-coupled multiphysics finite-element model of electromagnetic tube compression, using the commercial software Comsol Multiphysics. The presence of a field concentrator inside the solenoid coil is numerically modelled. First, the results of free compression of a S235 steel tube are presented. Next, the joining process of a S235 steel tube with an internal workpiece of the same material is considered by inclusion of a contact algorithm in the model. Simulation results are compared with available experimental data. The application of the model to materials with a high resistivity, such as steel, enables to identify interesting phenomena and opens new possibilities for the industrial application of this high velocity forming technique. © (2011) Trans Tech Publications. Source

Vekeman J.,Belgian Welding Institute | Huysmans S.,GDF SUEZ | De Bruycker E.,GDF SUEZ
Welding in the World | Year: 2014

The modern (USC PP) applying the 600 °C technology require advanced austenitic stainless steels in superheater/reheater systems in order to cope with the increased steam parameters. Different grades of austenitic stainless steels have been developed by increasing Cr contents, alloying with stabilizing and precipitating elements as well as thermomechanical heat treatments resulting in high creep rupture strengths and improved oxidation/corrosion resistance. In the context of a collaborative research project, DMV304HCu (X10CrNiCuNb18-9-3) has been selected. The main focus of the research project was on characterization and weldability assessment. As a result, the base metal under investigation was compared with governing code cases and specifications. Base metal chemical composition, microstructures, mechanical properties, reheat cracking sensitivity, hot ductility as well as creep rupture strengths have been investigated. A weldability assessment, including thermal simulation and welding procedure qualifications, has been performed to establish parameter windows for similar and dissimilar welding. Dissimilar welding between Grade 92 and austenitic stainless steel tubes has been performed. The project also took the opportunity to investigate the behavior of a recently developed gas tungsten arc welding (GTAW) P87 consumable for dissimilar welding. Cross-weld creep rupture testing has been conducted for both similar and dissimilar welding, and aging tests addressed microstructural stability. © 2014, International Institute of Welding. Source

Taban E.,Kocaeli University | Taban E.,Belgian Welding Institute | Dhooge A.,Ghent University | Kaluc E.,Kocaeli University | Deleu E.,Belgian Welding Institute
Welding Journal | Year: 2012

In this study, modified 12% Cr stainless steel with very low carbon level (0.01%) to improve the weldability and mechanical properties, still conforming to EN 1.4003 and UNS S41003 grades, was joined by gas metal arc welding. Plates 12 mm thick were welded with ER309LSi, ER308LSi, and ER316LSi austenitic stainless steel consumables. Several samples extracted from the joints were subjected to mechanical testing by means of tensile, bend, and Charpy impact toughness tests, while tensile fractographs were examined. Toughness after the postweld heat treatment (PWHT) for 30 min at 720° and 750°C was also examined. Microstructural examinations, including macro- and micrographs, grain size analysis, hardness, and ferrite measurements, were conducted. Salt spray and blister tests for corrosion testing were applied. Considering all data obtained, good strength and satisfactory ductility results were determined, while mi-crostructure-property relationship was explained. It can be recommended to use 309 and 316 welding wires for better corrosion resistance compared to 308 welding wires. More encouraging impact toughness properties related with finer grained microstructure were also obtained for the welds produced by 309 and 316 wires. Postweld heat treatment of the GMA weld with ER308LSi showed good improvement for toughness due to the tempering of the martensite at the coarse-grained heat-affected zone. Increasing heat treatment temperature from 720° to 750°C made additional improvements in toughness. Source

Faes K.,Belgian Welding Institute | Zaitov O.,Belgian Welding Institute | De Waele W.,Ghent University
ASM Proceedings of the International Conference: Trends in Welding Research | Year: 2013

In magnetic pulse welding, electromagnetic forces are used to deform, accelerate and weld workpieces. The process is mostly used for tubular specimens. In this study, experiments were performed to investigate the weldability of various material combinations. The weld quality was assessed based on metallographic examinations, scanning electron microscopy and hardness measurements. The weld interface morphology, the intermetallic phases and the most common weld defects are described. Copyright © 2013 ASM International® All rights reserved. Source

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