Excessive Lack of Fusion in Welds of Limited Accessibility
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Andreas Neidel
joined the Gas Turbine Plant of Siemens’ Energy Sector in 1984 and first underwent vocational training there. As a materials testing technician, one of the first fields of her professional endevours was steam turbine service, namely remaining lifetime assessment by means of the replica technique. She is a metallographer and one of the principal failure analysts in the materials testing laboratory. Her main fields of expertise comprise microstructural analyses of steel and iron castings.
Apprenticeship as a materials testing technician at the welding institute SLV Berlin-Brandenburg. After that, she studied materials science at the Berlin Institute of Technology. She graduated with a masters degree in materials science in 2012. Since November 2012 employment as engineer at the Metallography Laboratory of the Siemens Gas Turbine Works in Berlin. She has been appointed laboratory manager within the Berlin Testing Center of the Large Gas Turbine Engineering Group in 2014. Her main fields of expertise comprise failure analysis and microstructural investigations using the field emission scanning electron microscope.
Abstract
One definition of failure is that the subject component lost its function intended by design. The case study presented in this contribution is admittedly borderline in this respect. The parts in question have never seen any engine service and were taken straight out of fabrication, namely the weld shop. Welded components for turbomachinery exhibited excessive areas of lack of fusion in welds. Some of the subject assemblies were put in engine service in non-OEM machinery, without experiencing any failures. This was before weld imperfections were detected in fabrication. However, even though faulty components did not yet fail in service, the presented case is still categorized as a failure case, since the subject weld imperfections were so severe that failure had to be considered imminent. This
Kurzfassung
Es heißt in einer Definition von „Versagen“, dass das entsprechende Bauteil seine bestimmungsgemäße Funktion eingebüßt hat. Zugegebenermaßen ist die in diesem Beitrag vorgestellte Fallstudie in dieser Hinsicht ein Grenzfall, denn die entsprechenden Teile waren nie in einer Maschine im Einsatz und wurden direkt aus der Fertigung genommen, d. h. sie stammen aus der Schweißerei. Die Nähte von Schweißkomponenten für Turbomaschinen wiesen ausgeprägte Bereiche mit Bindefehler auf. Einige der entsprechenden Baugruppen kamen in Nicht-OEM-Maschinen (OEM, Original Equipment Manufacturer (Erstausrüster)) zum Einsatz, ohne dass es zu Ausfällen kam. Das war, bevor in der Fertigung Schweißfehler entdeckt wurden. Trotzdem fehlerhafte Komponenten bis dahin noch nicht im Betrieb versagten, wird der vorliegende Fall
About the authors
joined the Gas Turbine Plant of Siemens’ Energy Sector in 1984 and first underwent vocational training there. As a materials testing technician, one of the first fields of her professional endevours was steam turbine service, namely remaining lifetime assessment by means of the replica technique. She is a metallographer and one of the principal failure analysts in the materials testing laboratory. Her main fields of expertise comprise microstructural analyses of steel and iron castings.
Apprenticeship as a materials testing technician at the welding institute SLV Berlin-Brandenburg. After that, she studied materials science at the Berlin Institute of Technology. She graduated with a masters degree in materials science in 2012. Since November 2012 employment as engineer at the Metallography Laboratory of the Siemens Gas Turbine Works in Berlin. She has been appointed laboratory manager within the Berlin Testing Center of the Large Gas Turbine Engineering Group in 2014. Her main fields of expertise comprise failure analysis and microstructural investigations using the field emission scanning electron microscope.
References / Literatur
[1] Riesenbeck, S.: Internal Report BLN MT/2020/0136, Berlin, February 21, 2020.Search in Google Scholar
[2] Riesenbeck, S.: Internal Report BLN MT/2020/0165, Berlin, March 3, 2020.Search in Google Scholar
[3] Riesenbeck, S.: Internal Report BLN MT/2020/0180, Berlin, March 9, 2020.Search in Google Scholar
[4] WPS-173. Welding Procedure Specification, October 17, 2019.Search in Google Scholar
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Articles in the same Issue
- Contents
- Editorial
- Editorial
- Comparison of LPBF-manufactured and rolled tensile test samples made of 17-4PH
- Effect of heat treatment process on microstructure and properties of S47450 bolt
- Failure analysis
- Excessive Lack of Fusion in Welds of Limited Accessibility
- Picture of the month
- Picture of the month
- People
- 2022 Henry Clifton Sorby Awardee: Professor Harry Bhadeshia
- News
- News
- Meeting diary
- Meeting diary
