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ProRepaS - detection and evaluation of flaws in repair welds of NiAl-bronze propellers

Auffinden und Bewerten von Schweißfehlstellen in NiAl-Bronze Propellern
: Junglewitz, A.; Spies, M.; Kooij, A. van

Schiffbautechnische Gesellschaft e.V. -STG-, Hamburg:
Jahrbuch der Schiffbautechnischen Gesellschaft. Bd.101
Hamburg: Schiffahrts-Verlag Hansa Schroedter, 2008
Book Article
Fraunhofer ITWM ()
Propeller; NiAl-Bronze; material property; non-destructive testing; ultrasonic testing

Serious propeller damages in service require the costly docking of ships and a repair by welding. The total failure of a propeller blade is often characterized by fatigue lines on the cracked surface, starting mostly at a deficiency as a material defect or welding repair at the trailing edge of the blade. The current practice to supervise welding repairs is a strict welding performance according to a well-proven procedure and a dye-penetrant test in order to visualise surface deficiencies. If such flaws are inside the material, non-destructive testing methods have not been able to properly detect them, due to the material properties which are disadvantageous for the methods applied so far. Therefore, Germanischer Lloyd (GL) has initiated a research project concerning this matter, supporte d by the Bundesministerium für Wirtschaft und Technologie (BMWT).