9.0 Abteilungsleitung und andere
Filtern
Dokumenttyp
- Vortrag (129)
- Zeitschriftenartikel (50)
- Beitrag zu einem Tagungsband (26)
- Posterpräsentation (9)
- Buchkapitel (2)
- Forschungsbericht (2)
- Tagungsband (Herausgeberschaft für den kompletten Band) (1)
- Dissertation (1)
- Sonstiges (1)
Schlagworte
- Hydrogen (46)
- Welding (33)
- Wasserstoff (28)
- Schweißen (20)
- Diffusion (16)
- Hydrogen assisted cracking (15)
- Creep-resistant steel (14)
- High Entropy Alloy (11)
- High-entropy alloy (11)
- Mechanical properties (10)
- Hochfester Feinkornbaustahl (9)
- Fügetechnik (8)
- Hydrogen Embrittlement (8)
- Microstructure (8)
- Mikrolegierungseinfluss (8)
- Submerged arc welding (8)
- ToF-SIMS (8)
- WEZ-Erweichung (8)
- Forschung (7)
- Medium Entropy Alloys (7)
- Offshore (7)
- Stress relief cracking (7)
- UP-Schweißen (7)
- Post weld heat treatment (6)
- Residual stresses (6)
- Steel (6)
- TIG welding (6)
- Cracking (5)
- Gaseous hydrogen (5)
- High entropy alloy (5)
- Hochentropie Legierung (5)
- Review (5)
- Rührreibschweißen (5)
- SSRT (5)
- Schadensanalyse (5)
- Spannungsrelaxationsriss (5)
- Studie (5)
- Wärmenachbehandlung (5)
- AISI 304L (4)
- Atomic Forc Microscopy (4)
- Austenitic stainless steel (4)
- Carrier gas hot extraction (4)
- Deuterium (4)
- Digital Image Correlation (4)
- Electrochemical permeation (4)
- Friction stir welding (4)
- High Entropy Alloys (4)
- Hochentropielegierung (4)
- Hydrogen embrittlement (4)
- ISO 3690 (4)
- Kerbschlagzähigkeit (4)
- Multi-principal element alloys (4)
- Potentiodynamic Polarization (4)
- Residual stress (4)
- SIMS (4)
- Scanning Kelvin Probe Force Microscopy (4)
- Thermal desorption analysis (4)
- Thermodynamische Simulation (4)
- WIG-Schweißen (4)
- Weld metal (4)
- Additive manufacturing (3)
- Aqueous Corrosion (3)
- Component test (3)
- Corrosion (3)
- Data-fusion (3)
- Dissimilar metal weld (3)
- Dissimilar metal weld (DMW) joint (3)
- EBSD (3)
- Electrochemical Impedance Spectroscopy (3)
- Gutachten (3)
- High-strength steels (3)
- Hohlzugprobe (3)
- Hollow specimen (3)
- ICP-MS (3)
- Kupferazid (3)
- Medium entropy alloy (3)
- Mediumentropie Legierung (3)
- Mediumentropielegierung (3)
- Modifizierter Sprühlichtbogen (3)
- Multielementlegierungen (3)
- Pipeline (3)
- Prüfverfahren (3)
- Safety (3)
- Umlaufkühler (3)
- Achsschenkel (2)
- Bruchmechanische Auslegung (2)
- Creep-resisting materials (2)
- Degradation (2)
- Digital image correlation (2)
- Divergente Ausbildung der Wärmeeinflusszone (2)
- Duplex stainless steel (2)
- Duplex stainless steels (2)
- Eigenspannungen (2)
- Electron backscattered diffraction (2)
- Embrittlement (2)
- Experimental design (2)
- Explosion (2)
- Fahrrad (2)
- Fail-safe (2)
- Fatigue crack propagation (2)
- Fractography (2)
- Fraktographie (2)
- GMAW (2)
- H2Safety@BAM (2)
- HAZ-softening (2)
- Heat treatment (2)
- High-strength steel (2)
- High-strength structural steel (2)
- Hochfest (2)
- Hollow Specimen Technique (2)
- Hydrogen Assisted Cracking (HAC) (2)
- Implant test (2)
- In situ measurement (2)
- Kaltrissbildung (2)
- Kaltrissprüfung (2)
- Kerbschlagarbeit (2)
- Korrelation (2)
- LDX (2)
- LIBS (2)
- Laser beam welding (2)
- Lebensdauer (2)
- Machining (2)
- Martensite (2)
- Materialkompatibilität (2)
- Materialuntersuchung (2)
- Mechanical Engineering (2)
- Micro-shrinkages (2)
- Microalloying influences (2)
- Microbiologically influenced corrosion (2)
- Microstructure characterization (2)
- Minimum Waiting Time (2)
- Multiple cracks (2)
- Multiple principal element alloy (2)
- Numerical Simulation (2)
- Numerische Simulation (2)
- Offshore steel grade (2)
- Oxidation (2)
- Pipeline steel (2)
- Pitting (2)
- Querzugversuch (2)
- Reparatur (2)
- SEM (2)
- Scanning kelvin probe force microscopy (2)
- Schadensprävention (2)
- Schweißeigenspannungen (2)
- Schweißen von hochfesten FKB (2)
- Stahl (2)
- Stress corrosion cracking (2)
- Supermartensitic Stainless Steel (SMSS) (2)
- Temperature (2)
- ThermoCalc (2)
- Trapping (2)
- Ultrasonic assisted machining (2)
- Ultrasonic machining (2)
- Ultrasonic-assisted milling (2)
- WEZ Erweichung (2)
- WRC 1992 diagram (2)
- Wasserstoffunterstützte Kaltrissbildung (2)
- Welding microstructure (2)
- Werkstoffe (2)
- X-ray diffraction (2)
- Öffentliche Sicherheit (2)
- 9% Ni Steel (1)
- AISI 321 stainless steel (1)
- Additive Manufacturing (1)
- Adhesion by mechanical interlocking (1)
- AlSi10Mg (1)
- Alite (1)
- Alkyd resin-based coating (1)
- Alloys (1)
- Analytical calculation (1)
- Anlagenbau (1)
- Artefact (1)
- Ausscheidungsverhalten (1)
- Austenitic Stainless Steel (1)
- Austenitic Steels (1)
- Austenitic steel (1)
- Bauteiltest (1)
- Bauteilversuch (1)
- Bedarf (1)
- Bedeutung (1)
- Behavior (1)
- Biotische/abiotische Faktoren (1)
- Bismuth titanates (1)
- CCT diagrams (1)
- Carbon steel (1)
- Carrier gas hot extraction (CGHE) (1)
- Characterization of corrosion layers (1)
- Chemical composition (1)
- Chemical corrosion (1)
- Clinker substitute (1)
- Cold Cracking (1)
- Cold cracking (1)
- Competence Center (1)
- Competence center (1)
- Complex loading (1)
- Component (1)
- Component-like test (1)
- Compositionally complex alloy (1)
- Condensed Matter Physics (1)
- Contact fatigue (1)
- Contamination (1)
- Conventional and Tubular Specimen (1)
- Core-shell structures (1)
- Corrosion pits (1)
- Corrosion testing (1)
- Cr-Mo-V steel (1)
- CrMoV-Stahl (1)
- Crack arrest (1)
- Creep resisting materials (1)
- Creep-resisting steel (1)
- Critical strain (1)
- Critical strain rate (1)
- Crystallographic texture (1)
- Cyclic R-curve (1)
- DSS (1)
- Data fusion (1)
- Dduplex stainless steel (1)
- Debye waller factor (1)
- Debys-Waller-Factor (1)
- Defects (1)
- Dickblech (1)
- Diffusible hydrogen (1)
- Diffusibler Wasserstoff (1)
- Diffusion/diffusivity (1)
- Digital Image Correlation (DIC) (1)
- Digital image correlation (DIC) (1)
- Digitale Bildkorrelation (DIC) (1)
- Dilatometry (1)
- Duplex (1)
- EDXRD (1)
- Editorial Board (1)
- Einfluss Mikrolegierungselmente Ti und Nb (1)
- Einschlüsse (1)
- Einspanngrad (1)
- Electrochemical corrosion (1)
- Electron beam welding (1)
- Energieerzeugung (1)
- Energy Engineering and Power Technology (1)
- Ersatzgeometrie (1)
- FSW (1)
- Fatigue crack growth (1)
- Fatigue crack propagation stages (1)
- Fatigue fracture (1)
- Fatigue strength (1)
- Ferngasleitung (1)
- Ferritic Alloys (1)
- Ferritic steel (1)
- Ferritic steels (1)
- Ferroelectricity/ferroelectric materials (1)
- Finish milling (1)
- Forschungsprojekt (1)
- Fracture mechanics (1)
- Fuel Technology (1)
- Fusion zone size (1)
- GMA welding (1)
- GTAW (1)
- Gas analytic (1)
- Gas metal arc welding (1)
- Gas storage (1)
- Green Deal (1)
- H2 (1)
- H2-Abbau (1)
- H2Hohlzug (1)
- H2safety (1)
- HAZ-Softening (1)
- Handbook (1)
- Hardness (1)
- Heat control (1)
- Heat-affected zone (1)
- Herausforderungen beim Schweißen hochfester FKB (1)
- High Pressure Gaseous Hydrogen (1)
- High Temperature Corrosion (1)
- High temperature corrosion (1)
- High-entropy alloys (1)
- High-pressure (1)
- High-strength (1)
- Hochdruck (1)
- Hochentropiewerkstoff (1)
- Hochfeste Stähle (1)
- Hochfester Feinkornbaustahl S960QL (1)
- Hochfester Stahl (1)
- Hochfester vergüteter Feinkornbaustahl (1)
- Hollow specimen technique (1)
- Hollow tensile specimen (1)
- Hollow-specimen (1)
- Hybrid Laser arc Welding (1)
- Hybrid laser arc welding (1)
- Hydraulic reactivity (1)
- Hydrogen Strategy (1)
- Hydrogen assisted stress corrosion cracking (1)
- Hydrogen dependent mechanical properties (1)
- Hydrogen diffusion (1)
- Hydrogen-containing hot gas (1)
- I-Träger (1)
- Impact Absorbed Energy (1)
- Impact damage (1)
- Imperfektion (1)
- Implant failures (1)
- In-service (1)
- In-situ (1)
- In-situ tensile test (1)
- Inclusion cluster (1)
- Inclusion size (1)
- Initial crack size (1)
- Innovation (1)
- Interfacial stability (1)
- Intergranular cracking (1)
- Iron (1)
- Joining process (1)
- Journal (1)
- Kaltriss (1)
- Kerbschlagbiegeversuch (1)
- Kerbschlagbiegeversuch, Untermaßproben, Normalproben, Skalierung von Ergebnissen (1)
- Kompetenzzentrum H2Safety@BAM (1)
- Komponenten (1)
- Kontamination von H2 (1)
- Korrosion (1)
- Korrosionsschutz (1)
- Large-scale test (1)
- Lead-free ceramics (1)
- Loch- u. Spaltkorrosion (1)
- MAG-Schweißen (1)
- MIC (1)
- MatCom (1)
- Material defects (1)
- Material transport (1)
- Materialuntersuchungen (1)
- Measurement (1)
- Mechanics of Materials (1)
- Mechanische Eigenschaften (1)
- Messung (1)
- Metallic components (1)
- Metallurgie (1)
- Metals (1)
- Metals and Alloys (1)
- Microalloying elements Ti and Nb (1)
- Mikrolegierungseinflüsse (1)
- Mikrolegierungselemente (1)
- Mikroorganismen (1)
- Mild steels (1)
- Minimum waiting time (1)
- Mining head gear (1)
- Mis-match (1)
- Mischverbindung (1)
- Mock-up (1)
- Modeling (1)
- Modelling studies (1)
- ModuH2Pipe@BAM (1)
- Morphology control (1)
- Multi-principal element alloy (1)
- Multielement-Legierung (1)
- Multiple-principal element alloy (1)
- NDT (1)
- Nachwärmung (DHT) (1)
- Natural silver wires (1)
- Neutron Imaging (1)
- Neutron diffraction (1)
- Non-metallic inclusions (1)
- Normalproben (1)
- Notched impact strength (1)
- Oberflächenschädigung (1)
- Offshore steel (1)
- Offshore wind turbine (1)
- Optical flow (1)
- Overview (1)
- PCA (1)
- PWHT (1)
- Permeation (1)
- Perspektiven (1)
- Pipelines (1)
- Poly(acrylic acid) (1)
- Poren (1)
- Pores (1)
- Post Weld Heat Treatment (PWHT) (1)
- Post processing heat treatment (1)
- Post-weld heat treatment (1)
- Potentiodynamic measurements (1)
- Precipitation influence (1)
- Pressure-dependent solubility (1)
- Principal Component Analysis (1)
- Probengeometrie (1)
- Processing (1)
- Properties (1)
- Prozesse (1)
- Prüfung (1)
- Quality Infrastructure (1)
- Rauheit (1)
- Reactor conditions (1)
- Regelwerke (1)
- Renewable Energy, Sustainability and the Environment (1)
- Repair welding (1)
- Research (1)
- Research and Development (1)
- Risk Assessment (1)
- Riss (1)
- Rissarrest (1)
- Rissausbreitungsstadien (1)
- S690QL (1)
- Schallemissionsanalyse (1)
- Schweißeignung (1)
- Schweißverbindung (1)
- Scratches (1)
- Sicherer Umgang (1)
- Sicherheit (1)
- Skalierung von Ergebnissen (1)
- Slow strain tensile tests (1)
- Solidification cracking (1)
- Solubility (1)
- Spannungsrelaxationsrisse (1)
- Spannungsrisskorrosion (1)
- Spark plasma sintering (1)
- Statistics (1)
- Steelmaking slag (1)
- Strain rates (1)
- Stress Relief Cracking (SRC) (1)
- Stützeffekte (1)
- Sulphidation (1)
- Surface Integrity (1)
- Surface integrity (1)
- Surface preparation (1)
- Systematische Schadensanalysen, Prozeduren (1)
- T24 / 7CrMoVTiB10-10 (1)
- TEKKEN Test (1)
- TEKKEN-Test (1)
- Technologie (1)
- Technologies (1)
- Temperature distribution determination (1)
- Tensile Strength (1)
- Tensile Test (1)
- Tensile loading (1)
- Tensile test (1)
- Test procedure (1)
- Testing (1)
- Thermal conductivity device (1)
- Thermal-desorption spectroscopy (1)
- Thermo-Calc (1)
- Thermodynamic modelling (1)
- Thermodynamic simulation (1)
- Thick-walled (1)
- Thoughness (1)
- Time-of-Flight Mass Spectrometry (1)
- Time-of-Flight secondary ion mass spectrometry (1)
- Titanium (1)
- Traglastverhalten (1)
- TransHyDE (1)
- Trägergasheißextraktion (1)
- Tubular specimen technique (1)
- UP Schweißen (1)
- UV-blocker addition (1)
- Ultra-high strength steel (1)
- Ultrasonic Assisted Machining (1)
- Ultrasonic assited machining (1)
- Unterirdische Speicher (1)
- Untermaßproben (1)
- WEZ Aufhärtung (1)
- WIG (1)
- Waiting time (1)
- Warmfeste Stähle (1)
- Wasserstofflagerung (1)
- Wasserstoffstrategie (1)
- Wasserstofftechnologien (1)
- Wasserstoffunterstütze Kaltrissbildung (1)
- Weathering tests (1)
- Weld joint (1)
- Welding processing influences (1)
- Werkstoff (1)
- Werkstoffkompatibilität (1)
- Werstoff- und geometrische Imperfektion (1)
- Wind turbine (1)
- Windturbine (1)
- Wärmebehandlung (1)
- Wärmeeinflusszone (1)
- Year in Review (1)
- Zerspanung (1)
- ZnO films (1)
- ZnO nanorods Nanocrystalline (1)
- µCT (1)
Organisationseinheit der BAM
- 9 Komponentensicherheit (221)
- 9.0 Abteilungsleitung und andere (221)
- 9.4 Integrität von Schweißverbindungen (93)
- 9.2 Versuchsanlagen und Prüftechnik (55)
- 5 Werkstofftechnik (23)
- 5.1 Mikrostruktur Design und Degradation (22)
- 6 Materialchemie (19)
- 8 Zerstörungsfreie Prüfung (16)
- 6.1 Oberflächen- und Dünnschichtanalyse (12)
- 2 Prozess- und Anlagensicherheit (9)
Paper des Monats
- ja (6)
Eingeladener Vortrag
- nein (129)
This presentation describes the usability of the hollow tensile specimen technique for in-situ material testing in a hydrogen atmosphere.
In addition, the presentation provides an outlook on the methodology for investigating the suitability of pipeline steels and their weld seams for hydrogen operation.
The high potential of hydrogen as a key factor on the pathway towards a climate neutral economy, leads to rising demand in technical applications, where gaseous hydrogen is used. For several metals, hydrogen-metal interactions could cause a degradation of the material properties. This is especially valid for low carbon and highstrength structural steels, as they are commonly used in natural gas pipelines and analyzed in this work.
This work provides an insight to the impact of hydrogen on the mechanical properties of an API 5L X65 pipeline steel tested in 60 bar gaseous hydrogen atmosphere. The analyses were performed using the hollow specimen technique with slow strain rate testing (SSRT). The nature of the crack was visualized thereafter utilizing μCT imaging of the sample pressurized with gaseous hydrogen in comparison to one tested in an inert atmosphere.
The combination of the results from non-conventional mechanical testing procedures and nondestructive imaging techniques has shown unambiguously how the exposure to hydrogen under realistic service pressure influences the mechanical properties of the material and the appearance of failure.
Multiple principal element alloys encompass the well-known high entropy alloys (HEA). The alloy system represents a new class of materials consisting of at least three alloying elements, each containing 5 to 35 at.%. Thus, this alloying concept differs fundamentally from conventional materials such as steel or nickel alloys. For this purpose, the alloying elements are specifically selected, the microstructures are adjusted in a single-phase and, in some cases, multi-phase manner. In particular, conflicting goals, such as the trade-off between strength and ductility in conventional steels, are overcome. However, in the last 20 years, the focus has been on material synthesis. With the increase in available material quantities, the focus is now on processing issues such as joining and welding processes. The weldability of HEAs has received very little attention so far. The experience with dissimilar metal welds is completely lacking but is essential for the application of these materials in combination with conventional materials. The present study presents comprehensive experimental results on the weldability of an equimolar CoCrFeMnNi-HEA in cold-rolled and heat-treated condition, which was joined by tungsten inert gas welding to an austenitic steel AISI 304. The mechanical properties of the dissimilar metal welds were characterized by cross-weld tensile samples, whereas the local deformation in the weld of the different welding zones was measured by digital image correlation. In accordance with the respective initial HEA condition (cold-rolled vs. heat-treated), the local strain behavior was divergent and influenced the global mechanical properties of both DMW types. Nonetheless, the experiments provided proof in principle of the weldability for dissimilar joints of the CoCrFeMnNi-HEA welded to conventional materials like austenitic stainless steels ensuring a corresponding capability for mechanical loading. This allows further considerations on the application of these innovative materials.
Hydrogen has great potential on the path towards decarbonization of the energy and transport sectors and can mitigate the urgent issue of global warming. It can be sustainably produced through water electrolysis with potentially zero emissions, and efficiently used (e.g., in fuel cell systems). Despite its environmental advantages, hydrogen-metal interactions could result in the degradation of the mechanical properties of several structural materials. In order to determine the magnitude of the material degradation in relation to hydrogen exposure, extensive material testing is required. The standardized procedure for in-situ testing for the quantification of the impact of compressed gaseous hydrogen (CGH2) relies on the utilization of an autoclave around the tested specimen. Such test set-up is complex, expensive, time-consuming and requires special equipment, trained personnel, and strict safety procedures. A relatively recent method to circumvent these issues and provide affordable results consists of using hollow specimens, thus applying the hydrogen pressure inside rather than outside the specimen. It allows to reduce the volume of hydrogen by several orders of magnitude and to perform the tests more efficiently and in a safer manner. This study focuses on evaluating the tensile properties of X65 vintage pipeline steel tested in a high-pressure hydrogen environment using hollow specimens. Tests are performed in 6 MPa H2 and Ar at the nominal strain rate of 10−6 s−1 to evaluate the reduced area at fracture and the elongation loss. The effect of surface finishing on crack initiation and propagation is investigated by comparing two different manufacturing techniques. In this way, this study provides insights into the applicability of a novel, reliable, and safe testing method which can be used to assess the hydrogen-assisted ductility loss in metallic materials.
As energy carrier of the future, green hydrogen can make a decisive contribution to a sustainable energy supply. Particularly important is the decarbonization of heavy industry. Therefore, a reliable supply of hydrogen must be guaranteed. A hydrogen pipeline grid can achieve this purpose. In Europe concrete plans for a hydrogen pipeline grid already exist, as the so called “European Hydrogen backbone”. As building a completely new pipeline grid is economically not justifiable, a dual-way strategy of repurposing natural gas (NG) pipelines and newly built pipelines is intended. Long distance pipeline grids require regular maintenance and repairs. For natural gas (NG) pipelines in-service welding is state of the art. Concepts such as hot-tapping (drilling into pressurized pipelines) and “stoppling” (sealing off pipeline sections after installing bypasses or pressure relieves) allow the repair of damaged pipeline sections or the installation of new branches without shutting the pipeline down, which in most cases isn’t possible from an economic standpoint. The EIGA 121/14 guideline already pointed out in 2014 that “a hydrogen hot-tap shall not be considered a routine procedure”. This shows that the determination of the transferability of these repair concepts to hydrogen pipelines is of utmost importance. Due to the degrading effects of hydrogen on mechanical proper-ties, commonly referred to as “hydrogen embrittlement” it is necessary to understand and investigate the occurring effects. In the special case of repair welding on in-service hydrogen pipelines an increased hydro-gen uptake due to a large heat input and microstructural changes in the material needs to be considered. Therefore, material degradation must be investigated to determine whether modifications of repair procedures are necessary to ensure a reliable and safe hydrogen transportation via pipelines. For this reason, this paper gives an overview on existing weld repair concepts and its risks and limitations in terms of hydrogen absorption and possible embrittlement effects when transferred to hydrogen pipelines. The complexity lies in a large variety of materials (low alloyed steels), pipeline diameters and corresponding welded joints. The material compatibility of materials in used (repurposed NG-pipelines) and new condition must be investigated. Particularly for repurposed/used pipelines the effect of a pre-matured/corroded inner surface and sometimes insufficient documentation of the material “history” needs to be considered. An overview on ongoing and completed R&D-projects with respect to repair concepts for hydrogen pipelines and hydrogen effects on pipeline materials is given. The focus hereby lies on possible methods of material testing and modeling. Its current difficulties, limits and possible solution will be discussed.
Contemporary steels creep-resistant steels like the 13CrMoV9-10 are used as thick plates e.g., for applications in hydrocrackers. The large plate thickness requires high efficiency welding processes like submerged arc welding (SAW) and a mandatory post weld heat treatment (PWHT). The PWHT-parameters stem from a combination of empirical knowledge and traditional experiments on free shrinking (FS) welds. In that connection, the formation of so-called stress-relief cracking (SRC) must be anticipated. The SRC susceptibility of a welded component is a complex combination and interaction of com-ponent specific, thermal, and metallurgical factors. Many of which have to date not been conclusively researched. For example, it is well known that SRCs develop during PWHT due to formation and growth of carbides on prior austenite grain boundaries, resulting in a significant hardness increase (secondary hardening) and toughness decrease. This leads to a high SRC susceptibility of the coarse grain heat-affected zone (CGHAZ) of the last weld bead during PWHT. This is intensified in case of high residual stresses from the component-specific, structurally induced stiffness. In combination with multi-layer welding this leads to a multiaxial stress distribution. Nonetheless, the combined effect of PWHT and high-residual stresses on the SRC formation is merely unknown. For that reason, this study presents the effect of different heating rates in conjunction with a certain component stiffness. For that reason, SAW joints of 13CrMoV9-10 steel were investigated under FS and defined external restraint condition.
Mikrolegierungselemente wie Nb und Ti sind entscheidend für die erwünschte mechanische Festigkeit von vergüteten Feinkornbaustählen mit einer Nennstreckgrenze von ≥ 690 MPa. Aktuelle Spezifikationen geben lediglich Obergrenzen für die chemische Zusammensetzung vor, allerdings können geringfügige Abweichungen erhebliche Auswirkungen auf die mechanischen Eigenschaften haben. Die Vorhersage der Schweißbarkeit und Integrität von Schweißverbindungen stellt aufgrund der variierenden Zusammensetzung und Mikrostrukturen Herausforderungen dar. Unerwünschte Effekte wie Erweichung der Wärmeeinflusszone (WEZ) oder Verfestigung können auftreten. Um dies zu untersuchen, wurden verschiedene Mikrolegierungsrouten mit variierenden Ti- und Nb-Gehalten an Laborschmelzen erforscht. Die Basis jeder Route entsprach der üblichen S690QL in Zusammensetzung und Wärmebehandlung. Dreilagenschweißungen wurden mittels Metallaktivgasschweißens (MAG) durchgeführt, um kritische Gefügebereiche zu identifizieren. Die Analyse konzentrierte sich auf Phasenumwandlungen während der Abkühlung und metallurgisches Ausscheidungsverhalten. Die mechanischen Eigenschaften der Schweißnähte wurden durch Zugversuche ermittelt. Die Ergebnisse zeigen einen bedeutenden Einfluss der Mikrolegierungsroute und Schweißwärmezufuhr auf die Ausscheidungskinetik, trotz insgesamt guter Schweißbarkeit der Werkstoffe.
Zur Umsetzung der wasserstoffbasierten Energiewende ist eine zuverlässige Transportinfrastruktur unverzichtbar. Hierfür ist die Nutzung großer Teile des vorhandenen Erdgasnetzes vorgesehen. Im Rahmen von Reparatur- und Wartungsarbeiten ist das Schweißen im Betrieb an Erdgaspipelines Stand der Technik. In Verbindung mit Wasserstoff wirft diese Technik jedoch Fragen der Materialverträglichkeit auf. Das im Vortrag vorgestellte Projekt H2SuD leistet Beiträge zur Aufklärung des Einflusses von Reparaturschweißprozessen auf die Wasserstoffaufnahme und Degradation im Betrieb befindlicher H2 Gasleitungen. Ein Schwerpunkt des Vortrages liegt auf der im Projekt erarbeiteten Prüfmethode für Modellversuche, mit denen der Einfluss von Schweißen im Betrieb an Pipelines auf die Wasserstoffaufnahme getestet wird. Die Durchführung erster Versuche und dabei erzielte Ergebnisse werden präsentiert.