Fatigue strength of welded joints made of high-strength steels

2001 ◽  
Vol 3 (1) ◽  
pp. 86-94 ◽  
Author(s):  
Kengo Anami ◽  
Chitoshi Miki
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
High Strength Steels ◽  
High Strength

A review of fatigue strength improvement methods

1985 ◽  
Vol 12 (1) ◽  
pp. 166-183 ◽  
Author(s):  
Ian F.C. Smith ◽  
Manfred A. Hirt
Keyword(s):  
Quality Control ◽  
Finite Element ◽  
Fatigue Strength ◽  
Structural Steel ◽  
Welded Joints ◽  
Three Dimensional ◽  
High Strength Steels ◽  
High Strength ◽  
High Yield ◽  
Element Analysis

Improving the fatigue strength of welded joints may be economically interesting in many situations, especially in those cases where high-strength steels are used. However, widespread use of a method is, in many cases, restricted by a lack of knowledge of its reliability. Previous work has focused only on the effectiveness of improvement methods to increase fatigue strength; cost studies and quality control instructions are rarely given.In this report, several methods for structural steel are summarized. A review of existing test results shows that improved connections made from a high yield strength steel reveal a higher percentage improvement than mild steel connections using the same improvement method. In addition, improved joints may be sensitive to the applied stress ratio. Finally, the most efficient method depends on the type of welded joint.Residual stress methods have relatively inexpensive application costs whereas some grinding methods are very costly. Quality control depends upon fabrication, loading, and environmental conditions. Examination of four types of fillet-welded joints has identified several methods that require further research. A three-dimensional finite element study of these joints predicts that at crack locations, under service loading, a very small plastic zone is formed. Therefore, residual stress methods may remain effective under variable-amplitude load conditions. Key words: structural steel, welded joints, fatigue, improvement methods, fillet welds, finite element analysis.

scholarly journals Numerical analyses on welded joints at high‐strength steels

ce/papers ◽  
2019 ◽  
Vol 3 (3-4) ◽  
pp. 725-730
Author(s):  
Richard Stroetmann ◽  
Thoralf Kästner
Keyword(s):  
Welded Joints ◽  
High Strength Steels ◽  
High Strength ◽  
Numerical Analyses

Fatigue Crack Propagation Limit Curves for S690QL and S960M High Strength Steels and their Welded Joints

2018 ◽  
Vol 1146 ◽  
pp. 44-56 ◽  
Author(s):  
János Lukács ◽  
Ádám Dobosy ◽  
Marcell Gáspár
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Propagation ◽  
Crack Growth ◽  
Fatigue Crack Propagation ◽  
Welded Joints ◽  
High Strength Steels ◽  
High Strength ◽  
Base Materials ◽  
Propagation Limit

The objective of the paper is to present the newest results of our complex research work. In order to determination and comparison of the fatigue resistance, fatigue crack growth tests were performed on different grades of S690QL quenched and tempered, and S960TM thermomechanically rolled high strength steels.15 mmand30 mmthick base materials were used for our investigations. Welded joints were made from these base materials, using gas metal arc welding with matching, overmatching, and undermatching filler metals. In the paper, the performance of the welding experiments will be presented, especially with the difficulties of the filler material selection; along with the results of the fatigue crack growth examinations executed on the base materials and its welded joints. Statistical aspects were applied both for the presenting of the possible locations of the cracks in the base materials and the welded joints and for the processing of the measured data. Furthermore, the results will be compared with each other, and the possibility of derivation of fatigue crack propagation limit curves will be referred.

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