INFLUENCE OF WELD THICKNESS AND PLATE THICKNESS ON THE FATIGUE STRENGTH OF FILLET-WELDED CONNECTIONS

This article, from the Fraunhofer-Gesellscharft's Research Institute at Darmstadt, is based on the Institute's Research Report FB-131 (1978), and describes an investigation on the effects of weld-throat thickness and plate thickness upon the fatigue strength of the transition zones of fillet welds. Wohler tests were carried out on fillet-welded test pieces made from MRSt-37-2 steel plate. Each test piece contained an internal and an external flat-face weld at a right-angle junction; the pieces varied in respect of plate thickness (10-mm and 50-mm plates were used) and weld thickness (4, 10, and 35 mm). All welds were done by the metal-active-gas process, and the test pieces, some as-welded and others stress-relieved, were subjected to alternating loads. The experimental procedures and the results are presented in some detail. It was found, in all cases, that fatigue strength decreased with increasing weld-throat thickness. Strain-gauge measurements in the weldseam transition zone indicated that this was largely due to a geometrical amplitude factor which, in the case of the 4-mm, 20-mm, and 35-mm weld thickness concerned, implied a reduction of permissible nominal stress in the ratio 1:0.75:0.67. Further work is intended, with the object of broadening the basis of this study by investigating the influence of welding processes and techniques and of the type of steel.

  • Corporate Authors:

    Deutscher Verlag fuer Schweisstechnik GmbH

    Schadowstrasse 42
    4 Dusseldorf,   Germany 
  • Authors:
    • Haibach, E
    • Olivier, R
    • Ritter, W
  • Publication Date: 1978-11

Language

  • German

Media Info

  • Features: References;
  • Pagination: p. 442
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00194216
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jun 13 1979 12:00AM