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Einfluß des Vibrationsentspannens auf die Schwingfestigkeit von reparaturgeschweißten Nähten im Vergleich zum Spannungsarmglühen

Influence of stress relieving by vibration as compared to postweld heat treatment on the fatigue behaviour of repaired welds
: Müller, F.; Sonsino, C.M.
: Fraunhofer-Institut für Betriebsfestigkeit -LBF-, Darmstadt

Darmstadt, 1991, 12 pp. : Abb.,Tab.,Lit.
Technische Mitteilungen - Fraunhofer-Institut für Betriebsfestigkeit Darmstadt, 103
ISSN: 0173-3656
Fraunhofer LBF ()
Eigenspannungsabbau; fatigue life; investigation of fatigue behaviour; Lebensdauer; postweld heat treatment; residual stress relieving; Schwingfestigkeitsuntersuchung; Spannungsarmglühen; test; Versuch; vibration treatment; Vibrationsbehandlung

The elemination or reduction of tensile residual stresses in welded components is mainly carried out by thermal treatment. This technique is well known and generally leads to a better fatigue behaviour. As the stress relieving by heat treatment is rather expensive, when it is applicated to components with larger dimensions, one is looking for an alternative, e.g. vibration stress relieving. In the present paper the fatigue behaviour of repair welded specimens, containing high tensile residuals stresses, was examined in three states: - as-welded (no postweld heat treatment) - vibration stress relieved - thermally stress relieved After the investigation the following conclusions have to be drawn: The residual stress measurements showed, that the vibration treatment did not reduce the tensile residual stresses. In the high cycle fatigue range the as welded specimens and also the vibrated specimens did not reach the fatigue life of the thermally treated specimens. The vibrated specimens we re only slightly better than the as-welded specimens. As the substitution of the postweld heat treatment by vibration treatment was not successful, and due to the absence of reliable guidelines for this technique, the industrial application of vibration treatment could not be recommended.