Fatigue behaviour of manually produced butt welds at thin plates considering common imperfections

Field of Research: Fatigue Strength

Duration: 01.09.2008 – 30.07.2010

Partner: Bundesamt für Wehrtechnik und Beschaffung, Blohm & Voss Nordseewerke, Fr. Lürssen Werft, Peene-Werft, Germanischer Lloyd, Technische Universität Hamburg-Harburg

 

Backround:

Manually produced butt welds, as they often appear at block joints in shipbuilding, have distortions like angular and axial misalignment. Tolerances are defined in regulations like “Production Standard of German Shipbuilding Industry”, but for a plate thickness below 6 mm hard to fulfill.

This investigation is about manual weldings at block joints with a plate thickness of 4 mm. The test objects were produced under realistic conditions. The intention is proving sufficient fatigue behaviour of this detail.

Until now no damages have been reported at such structures. Nevertheless it is necessary to investigate the influence of misalignments at thin plates. It can be assumed that in future such structures will be increasingly used in shipbuilding. A validated background for dimensioning is essential and to be made available here.

Persons:

Dr.-Ing. H.Paetzold

Dipl.-Ing. O.Feltz

Further publications:

Eggert, L.; Fricke, W. und Paetzold, H.: Betriebsfestigkeit von Dünnblech-Montagestößen unter Berücksichtigung werftüblicher Imperfektionen. Jahrbuch der Schiffbautechnischen Gesellschaft, 105. Bd. (2011), Schifffahrts-Verlag „Hansa“ C. Schroeder & Co., Hamburg 2012.

Eggert, L.; Fricke, W. und Paetzold, H.: Betriebsfestigkeit von Dünnblech-Montagestößen mit werftüblichen Imperfektionen im Schiffbau. In: Schweißen im Schiffbau und Ingenieurbau 2011, S. 32-38, DVS-Berichte Band 277, DVS Media, Düsseldorf 2011.

Feltz, O. und Fricke, W.: Einflüsse zwischen Bauteil- und Kleinprobe auf die Betriebsfestigkeit von Dünnblech-Montagestößen im Schiffbau. In: Schweißen im Schiffbau und Ingenieurbau 2011, S. 39-46, DVS-Berichte Band 277, DVS Media, Düsseldorf 2011.

Feltz O. und Fricke W.: 3-Dimensional Geometrical Effects on the Fatigue Strength of Manual Butt-Welds in Thin Plates, Proc. of IIW Int. Congress on Advances in Welding Science (Ed. M. Koçak), pp. 77-81, Technology AWST2011, Antalya 2011.

Eggert, L.; Fricke, W.; Paetzold, H. (2012): Fatigue strength of thin-plated block joints with typical shipbuilding imperfections. Welding in the World 56, No. 11/12.

Feltz, O.; Fricke, W. (2012): Consideration of influence factors between small-scale specimens and large components on the fatigue strength of thin-plated block joints in shipbuilding. IIW-Doc. XIII-2418-12, International Institute of Welding.