Description: Das Projekt "Qualifizierung des Elektronenstrahlschweißens im Dickblechbereich für Anwendungen im Windenergieanlagenbau" wird vom Umweltbundesamt gefördert und von RWTH Aachen University, Institut für Eisenhüttenkunde - IEHK durchgeführt. Due to ecological reasons and because of the need to remain independent from foreign energy suppliers, the power generation in offshore wind parks becomes more and more important in Germany. It is therefore planned to build up approximately 1,300 new offshore wind power plants with a capacity of 6,500 MW near the German coastline until 2020. The structures are installed on the ground of the sea in a water depth that might in some cases reach 50 m. The mechanical loading situation for these structures is characterised by an enormous weight combined with high cyclic stresses resulting from the service loads and the tide. Hence, hot rolled steels with a yield strength of 355 MPa are employed in a maximum thickness of 100 mm. Until now, the required toughness properties for these structural steels and their welds are 40 J at -20 C. However, in a plate thickness of 100 mm, only the submerged arc welding (SAW) process can be used to guarantee such toughness properties, but especially in these heavy plates, submerged arc welding is rather time consuming and consequently more uneconomic compared to other welding techniques. Due to these disadvantages, it can even be expected that only part of the planned power plants will be built up in time as the high welding time of several hours per m causes too many delays. From the point of structural integrity, it can be argued wether a Charpy impact toughness of 40 J is really required, as this criterion is only set based on experiences of mechanical and civil engineers. Thus, it can be concluded that different welding techniques should be regarded as alternatives to SAW in case that the 'real' toughness requirements are less than 40 J at -20 C. Electron beam welding would be a favourable welding process for such heavy plates as even 100 m thick plates can be welded in one single step, but until now the toughness requirements of 40 J have not yet been met. It is therefore the aim of the research project to reinforce the electron beam welding process for the application to heavy plates in offshore wind power plants. To reach this aim, the following tasks are be carried out: - improvement of the electron beam welding process in order to achieve better toughness properties of the welds, - application of reliable fracture mechanics concepts in order to calculate realisitc toughness requirements. With regard to the process, already a this stage of the project an enormous improvement of the toughness properties of EB weld seams could be demonstrated based on optimisation of the welding process. Furthermore, it could be shown that by establishing the leakage before breakage criterion combined with regular inspections, the toughness requirements can be significantly reduced. Thus, the EB welding can be applied to offshore wind energy installations even if steels of higher yield strength (e.g. S460Q) are selected.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Aachen ? Offshore-Windenergie ? Blech ? Platin ? Offshore-Windkraftanlage ? Tidehochwasser ? Elektrizität ? Ökologie ? Windenergie ? Wind ? Bundesrepublik Deutschland ? Offshore-Windpark ? Stromerzeugung ? Gebäude ? Gewährleistung ? Stress ? Verfahrensoptimierung ? Triebwerk ? Rechtsverfahren ? Forschungsprojekt ? Bautechnik ? Bewässerung ? Energie ? Energiegewinnung ? Technik ? Kraftwerk ? Meeresgewässer ? Wasser ? Belastung ? Wirkung ? REACH ? Küstenlinie ? Bedarf ? Dienstleistung ? Erdoberfläche ? Forschung ? Gezeiten ? Leckage ? Schweißen ? Anlage ? Offshore ? ANGEWANDT ? NEU ? AUSGEWAEHLT ? DICKE ? Verwertung ? WICHTIG ? EIN ? ERFORDERNIS ? ERGEBNIS ? PROJEKT ? Erlass [Recht] ? FUEGEN ? GEMISCHT ? SONSTIG ? STRAHL ? Aufladung ? TEIL ? BEREICH ? BEZUG ? VERARBEITEN ? VERGLEICHEN ? GEPLANT ? GEWICHT ? GROESST ? VERLAGERUNG ? INSPEKTION ? KRITERIUM ? VERSTAERKUNG ? Buchgrundstück ? LEISTUNGSFAEHIGKEIT ? Mechanische Belastung ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2011-01-01 - 2013-06-30
Accessed 1 times.