Abstract
This study investigated the fatigue life of welded joints, in particular, the welds of the high-strength steel S960 QL. The welds were created using unconventional technologies by utilising laser and electron beams. The direct application of the research is intended to be carried out through implementing the results towards the design of tracks for the track-wheel chassis of the demining system Božena 5. The producer’s experience shows the damage found in the current track design. The damage occurred during reversing the vehicle on a sand surface. Our goal was to solve this problem. The information acquired in this research will be a very important input factor for further designs of the track made of the tested material and its welds. The analysis of the residual stresses was also part of this study. The experimental research of the tested material’s fatigue life and welded joints was realised on the specimens loaded using cyclic bending and cyclic torsion. These loads were dominant during the track operation. The fatigue life of the tested material was detected using a device designed by us. The measurement results were processed in the form of the Wöhler’s S–N curves (alternating stress versus number cycles to failure) and compared with the current regulations issued by the International Institute of Welding (IIW) in the form of the FAT curves (IIW fatigue class). The achieved research results indicate that the modern welding technologies (laser and electron beams) used on the high-strength steel had no principal influence on the fatigue life of the tested material.
Highlights
Steel seems to be one of the most important materials in engineering practice
The achieved research results indicate that the modern welding technologies used on the high-strength steel had no principal influence on the fatigue life of the tested material
We showed that neither progressive method had a principal influence on the fatigue life of the high-strength steel
Summary
Steel seems to be one of the most important materials in engineering practice. The history of steel dates back to more than two millennia ago, and since that time, its production procedures and utilisation properties have been constantly improved.One of the main reasons for the broad implementation of steel is the occurrence of iron ore and relatively rapid and low-cost production. Steel seems to be one of the most important materials in engineering practice. The history of steel dates back to more than two millennia ago, and since that time, its production procedures and utilisation properties have been constantly improved. One of the main reasons for the broad implementation of steel is the occurrence of iron ore and relatively rapid and low-cost production. The replacement of the conventional structural steels with high-strength steels will cause a significant change in the individual members’ cross-section without changing their carrying capacity. This fact naturally leads to savings in the amount of required material [1,2]
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