Research of the Fatigue Life of Welded Joints of High Strength Steel S960 QL Created Using Laser and Electron Beams

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.

[1]  G. Totten,et al.  Handbook of Residual Stress and Deformation of Steel , 2001 .

[2]  Xiaohua H. Cheng,et al.  Residual stress modification by post-weld treatment and its beneficial effect on fatigue strength of welded structures , 2003 .

[3]  Wolfgang Fricke,et al.  Fatigue analysis of welded joints: state of development , 2003 .

[4]  Zhili Feng.  Processes and mechanisms of welding residual stress and distortion , 2005 .

[5]  Michael E. Fitzpatrick,et al.  Determination of residual stresses by X-ray diffraction , 2005 .

[6]  Christian Cremona,et al.  Improved Assessment Methods for Static and Fatigue Resistance of Old Metallic Railway Bridges , 2007 .

[7]  Juraj Gerlici,et al.  Railway wheel and rail head profiles development based on the geometric characteristics shapes , 2011 .

[8]  U. Kuhlmann,et al.  Welded Connections of High-Strength Steels For The Building Industry , 2012, Welding in the World.

[9]  F. Gutiérrez-Solana,et al.  Influence of the Flame Straightening Process on Microstructural, Mechanical and Fracture Properties of S235 JR, S460 ML and S690 QL Structural Steels , 2013 .

[10]  W. Fricke.  IIW guideline for the assessment of weld root fatigue , 2013, Welding in the World.

[11]  Milan Sapieta,et al.  A Detection of Deformation Mechanisms Using Infrared Thermography and Acoustic Emission , 2014 .

[12]  David,et al.  Weldable high-strength steels: Challenges and engineering applications , 2015 .

[13]  Stasys Dailydka,et al.  Analysis of Freight Wagon Wheel Failure Detection in Lithuanian Railways , 2016 .

[14]  A. Hobbacher.  Recommendations for fatigue design of welded joints and components , 2016 .

[15]  Nenad Gubeljak,et al.  Evaluation of slip line theory assumptions for integrity assessnment of defected welds loaded in tension , 2017 .

[16]  Ben Young,et al.  Tests on high-strength steel hollow sections: a review , 2017 .

[17]  Gediminas Vaičiūnas,et al.  Research on metal fatigue of rail vehicle wheel considering the wear intensity of rolling surface , 2017 .

[18]  M. Vaško,et al.  Numerical Estimation of the Shape of Weld and Heat Affected Zone in Laser-arc Hybrid Welded Joints , 2017 .

[19]  J. Riski.  Low-cycle fatigue of S960 , 2017 .

[20]  Juraj Gerlici,et al.  The development of diagnostics methodological principles of the railway rolling stock on the basis of the analysis of dynamic vibration processes of the rail , 2018 .

[21]  D. Mansouri,et al.  Fatigue characteristics of continuous welded rails and the effect of residual stress on fatigue-ratchetting interaction , 2018, Mechanics of Advanced Materials and Structures.

[22]  M. Morgan,et al.  Evaluation of Diamond Dressing Effect on Workpiece Surface Roughness by Way of Analysis of Variance , 2018 .

[23]  Vladislav Baniari,et al.  Determination the maximum load capacity of the welded structure of the transport carriage in operation , 2018 .

[24]  A. Czán,et al.  Preliminary Study of Residual Stress Measurement Using Eddy Currents Phasor Angle , 2018, Advances in Manufacturing Engineering and Materials.

[25]  A. Vagaská,et al.  Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium , 2019, Coatings.

[26]  V. M. Goritskii,et al.  Effect of Chemical Composition and Structure on Mechanical Properties of High-Strength Welding Steels , 2019, Metallurgist.

[27]  J. Valícek,et al.  A new way of identifying, predicting and regulating residual stress after chip-forming machining , 2019, International Journal of Mechanical Sciences.

[28]  E. Kabo,et al.  Numerical assessment of the loading of rolling contact fatigue cracks close to rail surface irregularities , 2020 .

[29]  S. Karamanos,et al.  Structural behavior and design of high-strength steel welded tubular connections under extreme loading , 2020 .

[30]  S. Babu,et al.  Correlation of Local Constitutive Properties to Global Mechanical Performance of Advanced High-Strength Steel Spot Welds , 2020, Metallurgical and Materials Transactions A.

[31]  M. Szala,et al.  Diagnosis of the microstructural and mechanical properties of over century-old steel railway bridge components , 2020 .