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Mechanical properties of friction stir welded St 37 and St 44 steel joints

  • Tevfik Küçükömeroğlu , Semih Mahmut Aktarer , Güven İpekoğlu und Gürel Çam
Veröffentlicht/Copyright: 18. Januar 2019
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Materials Testing
Aus der Zeitschrift Materials Testing Band 60 Heft 12

Abstract

In this study, the weldability of lower strength St 37 grade steel plate with a higher strength steel plate (i. e., St 44) using the friction stir welding technique has been studied. St 37 grade steel sheets are widely used in various industries. However, the joining of St 37 steel plates with higher strength grades such as St 44 grade steel is usually required when the strength of St 37 grade is not sufficient. Therefore, microstructural and mechanical properties of friction stir welded St 37-St 44 butt joints were investigated by conducting optical microscopy, microhardness measurements, and tensile testing. A fine-grained recrystallized microstructure was observed in the weld regions of the joints produced. The highest tensile strength, i. e. 385 MPa, was exhibited by the joint produced at 630 rev × min−1.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurde die Schweißbarkeit einer Platte eines Stahles St 37 mit einer niedrigeren Festigkeit mit einer Platte aus einem Stahl St 44 mit einer höheren Festigkeit unter Einsatz des Rührreibschweißprozesses (Friction Stir Welding – FSW) untersucht. Bleche aus dem Stahl St 37 werden breitflächig in verschiedenen Industriezweigen verwandt. Allerdings wird ein Verbinden mit Stählen höherer Festigkeit benötigt, wenn die Festigkeit des Stahles St 37 nicht ausreicht. Daher wurden die mikrostrukturellen und mechanischen Eigenschaften von FSW-Stumpfschweißverbindungen des Typs St 37-St 44 untersucht, indem Lichtmikroskopie, Mikrohärtemessungen und Zugversuche angewandt wurden. Es wurde eine feinkristallisierte Mikrostruktur in den Schweißverbindungen beobachtet. Die höchste Zugfestigkeit von 385 MPa ergab sich für die Schweißverbindung, die mit einer Umdrehungsgeschwindigkeit von 630 rev × min−1 hergestellt wurde.

*Correspondence Address, Prof. Dr. Gürel Çam, Iskenderun Technical University, Faculty of Engineering and Natural Sciences, Department of Mechanical Engineering, Iskenderun, Hatay, 31200 Turkey, E-mail:

Prof. Tevfik Küçükömeroğlu is Professor and is Vice-Dean of the Faculty of Engineering and currently working in the Department of Mechanical Engineering, Faculty of Engineering, Karadeniz Technical University, Trabzon, Turkey.

Semih Mahmut Aktarer is Lecturer at Recep Tayyip Erdoğan University and currently working at the Vocational School of Recep Tayyip Erdoğan University, Rize, Turkey.

Assistant Prof. Güven İpekoğlu is currently working at the newly established Iskenderun Technical University, Hatay, Turkey. His fields of research include solid state welding techniques of structural materials, solid mechanics, and the mechanical behavior of welded joints.

Prof. Gürel Çam is Professor at the Iskenderun Technical University, Hatay, Turkey. He is currently a member of the Editorial Board of Journal of Sci. Technol. Weld. Join. since January 2008 and member of the General Board of Turkish Welding Technology Academy, Istanbul.

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Published Online: 2019-01-18
Published in Print: 2018-12-04

© 2018, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Effects of full-scale reel-lay simulation on mechanical properties of X65 grade pipeline girth welds
  5. Strain accumulation at the top and bottom side of a friction stir welded alloy AZ31 under tensile and compressive loading
  6. Mechanical properties of friction stir welded St 37 and St 44 steel joints
  7. Effect of drawing strain on fatigue behavior of steel tire cord filaments
  8. Microstructural and thermal characterization of 39NiCrMo3 steel
  9. NDT of spot welds by imaging analysis of the residual magnetic flux density – Investigation on the influence of electrode indentation on the measurement results
  10. Effect of thermal history on the tensile strength of a friction stir welded aluminum alloy
  11. Testmethode zur Bewertung von Fügeelementen hinsichtlich der Gefahr einer wasserstoffunterstützten Kaltrissbildung (HACC-Prüfung)
  12. Effect of coating on tool inserts and cutting fluid flow rate on the machining performance of AISI 1015 steel
  13. Neutronen-Laminografie am Beispiel eines historischen Artefakts
  14. Modeling of ECM process parameters
  15. Effect of TiB2 particle addition on the mechanical properties of Al/TiB2 in situ formed metal matrix composites
  16. Mechanical and tribological behavior of SiC and fly ash reinforced Al 7075 composites compared to SAE 65 bronze
  17. Performance of a salt-resistant mixture of bentonite and field soil as impermeable material in solid waste landfills
  18. Bond strength of alkali-activated slag based tunnel fireproof coating material
https://doi.org/10.3139/120.111266

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Effects of full-scale reel-lay simulation on mechanical properties of X65 grade pipeline girth welds
  5. Strain accumulation at the top and bottom side of a friction stir welded alloy AZ31 under tensile and compressive loading
  6. Mechanical properties of friction stir welded St 37 and St 44 steel joints
  7. Effect of drawing strain on fatigue behavior of steel tire cord filaments
  8. Microstructural and thermal characterization of 39NiCrMo3 steel
  9. NDT of spot welds by imaging analysis of the residual magnetic flux density – Investigation on the influence of electrode indentation on the measurement results
  10. Effect of thermal history on the tensile strength of a friction stir welded aluminum alloy
  11. Testmethode zur Bewertung von Fügeelementen hinsichtlich der Gefahr einer wasserstoffunterstützten Kaltrissbildung (HACC-Prüfung)
  12. Effect of coating on tool inserts and cutting fluid flow rate on the machining performance of AISI 1015 steel
  13. Neutronen-Laminografie am Beispiel eines historischen Artefakts
  14. Modeling of ECM process parameters
  15. Effect of TiB2 particle addition on the mechanical properties of Al/TiB2 in situ formed metal matrix composites
  16. Mechanical and tribological behavior of SiC and fly ash reinforced Al 7075 composites compared to SAE 65 bronze
  17. Performance of a salt-resistant mixture of bentonite and field soil as impermeable material in solid waste landfills
  18. Bond strength of alkali-activated slag based tunnel fireproof coating material
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