HCF design curves for high strength steel welded joints
DOI:
https://doi.org/10.32972/dms.2018.011Keywords:
high strength structural steel (HSSS), RUUKKI Optim 700QL, SSAB Weldox 700E, high cycle fatigue (HCF)Abstract
The objective of this article is to present the newest results of our complex research work related to the high cycle fatigue (HCF) resistance of advanced high strength structural steels (HSSS). RUUKKI Optim 700QL and SSAB Weldox 700E steels were used for the investigations with 690 MPa yield strength. During the HCF tests base materials and their welded joints using gas metal arc welding as a joining process were tested at different mismatch conditions [matching (M), overmatching (OM), and matching/overmatching (M/OM)] for optimising welding process to achieve an improvement in the fatigue strength. Statistical approach was applied during the preparation and the evaluation of the investigations, which increased their reliability. The parameters of the determinable HCF design curves were calculated based on the philosophy of the Japanese method (JSME S 002-1981). During the investigations and the evaluation the results were compared with each other and with literary data.
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