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Eingeladener Vortrag
- nein (910)
Dieses Dokument fasst den Projekfortschritt des BAM-Projektes "Ermittlung geeigneter Wärmeführungen zur Wasserstoffreduktion beim Schweißen höherfester Feinkornbaustähle mit modifiziertem Sprühlichtbogen" im Rahmen des Fachausschusses 1 "Schweißmetallurgie & Werkstoffverhalten" des DVS e. V. zusammen.
Dieses Dokument fasst den Projekfortschritt des BAM-Projektes "Ermittlung geeigneter Wärmeführungen zur Wasserstoffreduktion
beim Schweißen höherfester Feinkornbaustähle mit modifiziertem
Sprühlichtbogen" im Rahmen des Fachausschusses 1 "Schweißmetallurgie & Werkstoffverhalten" des DVS e. V. zusammen.
Rubber is widely used as sealing material in various applications. In many fields the function of seal materials at low temperatures is necessary. Therefore, the understanding of failure mechanisms that lead to leakage at low temperatures is of high importance.
It is known that the material properties of rubbers are strongly temperature dependent. At low temperatures this is caused by the rubber-glass transition (abbr. glass transition). During continuous cooling, due to the glass transition the material changes from rubber-like entropy-elastic behaviour to stiff energy-elastic behaviour, that allows nearly no strain or retraction. Hence, rubbers are normally used above their glass transition. But as the minimum working temperature limit of elastomers cannot be defined globally and precisely, the lower operation temperature limit of rubber seals should be determined in dependence of the application conditions and the most relevant material properties.
In this paper, wesummarize results of our temperature dependent investigation of seal material properties by classical thermal analysis as Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA), combined with measurements of standardized tests as compression set and the seal performance determined in component tests. To reduce the test time of compression set tests a faster technique was developed and applied.
To study the influence of dynamic events on the seal performance and to enhance the understanding of occurring seal failure, a setup for a fast partial seal release was designed.
Überblick über die Normung zur Konformitätsbewertung- (ISO CASCO Toolbox)
Revision der ISO/IEC 17025 – Anforderungen an Labors
Revision der ISO/IEC 17011 - Anforderungen an Akkreditierungsstellen
Revision des ISO Guide 34 (neu: ISO 17034) -Anforderungen an die Kompetenz von Herstellern von Referenzmaterialien
Single wire Gas Metal Arc Welding (SGMAW) and high power Tandem GMAW (TGMAW) are evaluated with respect to energy efficiency. The key performance indicator Electrical Deposition Efficiency is applied to reflect the energy efficiency of GMAW in different material transfer modes. Additionally, the wall-plug efficiency of the equipment is determined in order to identify the overall energy consumption. The results show that energy efficiency as well as economic process performance can be significantly increased by application of tandem processes. A comparative Life Cycle Assessment of a 30 mm thick weld is conducted to investigate the influences of the energy efficiency on the environmental impacts. Environmental burdens in the categories Global Warming Potential, Acidification Potential, Eutrophication Potential and Photochemical Ozone Creation Potential can be reduced up to 11% using an energy efficient TGMAW process
Abstract: The dangerous goods regulations UN/ADR 6.1.5.5.4 a) prescribe a maximum filling degree for determining the test pressure for the hydraulic pressure test by real measurements. The assumption is that the maximum filling degree of the liquid phase is the worst case concerning the gauge pressure. Therefore the main objective of this study is to investigate the effect of the filling degree on the gauge pressure.
Gauge pressure measurements and calculations for different substances were carried out at different filling degrees for a steel drum and a steel jerrican (heating-up from 15 °C to 55 °C).
The assumption that the maximum filling degree is the most critical is only valid for relatively rigid packagings: If the relative expansion of the packaging is smaller than the volume increase of the liquid phase due to heating-up, the gauge pressure increases with increasing filling degree.
But the opposite is true for relatively flexible packagings: If the relative expansion of the packaging exceeds the relative volume expansion of the liquid, the gauge pressure increases for decreasing filling degrees. The current regulations for the hydraulic test pressure determination at a maximum filing degree do not lead to the intended safety level. For a lower level than the maximum filling degree, the prescribed safety factor of 1.5 is not respected. Under transport conditions it is possible that the inner gauge pressure exceeds the test pressure. This can result in a failure of the packaging. There is a need to reconsider the regulations.
Experimentelle Untersuchungen zu streifenden Schlägen mit verschiedenen Edelstahlsorten in explosionsfähigen Atmosphären, jeweils bestehend aus Wasserstoff, Acetylen, Ethylen bzw. Propan mit Luft, haben gezeigt, dass deren Zündwahrscheinlichkeit sowohl von der Art des Brenngas-Gemisches als auch der Höhe der kinetischen Schlagenergie abhängt. Ein Einfluss des Chromgehaltes im Edelstahl auf die Zündwahrscheinlichkeit durch mechanisch erzeugte Schlagvorgänge konnte in dem untersuchten Bereich des Chromgehaltes nicht nachgewiesen werden, obwohl ein steigender Chromgehalt die Oxidationsfähigkeit abgetrennter Partikel erhöhter Temperatur tatsächlich senkt. Ferner haben weitere Werkstoffeigenschaften wie die Wärmeleitfähigkeit, spezifische Wärmekapazität, Dichte und Härte einen Einfluss auf die Zündwahrscheinlichkeit mechanischer Edelstahl-Schlagvorgänge bei Wasserstoff/Luft-Gemischen. Mit steigender Wärmeleitfähigkeit des Edelstahls sinkt die Zündwahrscheinlichkeit. Für die spezifische Wärmekapazität, Dichte und Härte konnte kein Einfluss nachgewiesen werden.
Für Schlagvorgänge wurden in der Norm EN 13463-1:2009 (DIN, 2009) Grenzwerte für die maximale kinetische Schlagenergie festgelegt, unterhalb derer die Entstehung einer wirksamen Zündquelle als unwahrscheinlich angenommen werden kann. Dabei wurde zwischen Schlagvorgängen mit funkenarmen Metallen, wie z. B. Kupfer, Messing, und Schlagvorgängen mit sogenannten „sonstigen Werkstoffen“ unterschieden. Die Grenzwerte dieser sonstigen Werkstoffe resultieren aus Versuchen der BAM mit unlegiertem Baustahl. Bei solchen Schlagvorgängen wird von Oxidationsprozessen einzelner Partikel mit dem Luftsauerstoff ausgegangen, die das Gasgemisch aufgrund des hohen Temperaturanstiegs entzünden.
In industriellen Anwendungen wie zum Beispiel der chemischen Industrie wird jedoch statt ferritischem Stahl überwiegend Edelstahl verwendet. Im Allgemeinen gilt mit Chrom hochlegierter Edelstahl bei Schlagvorgängen gegenüber ferritischem Stahl als funkenärmer, da die Oxidationsfähigkeit von Edelstahlpartikeln mit steigendem Chromgehalt abnimmt.
Bei den Schlagversuchen der BAM konnte zwar eine sinkende Oxidationsfähigkeit der Partikel, aber keine abnehmende Zündwirksamkeit von Edelstählen mit steigendem Chromgehalt beobachtet werden.