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Licensed Unlicensed Requires Authentication Published by De Gruyter January 18, 2019

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

Mechanische Eigenschaften von rührreibgeschweißten Verbindungen der Stähle St 37 und St 44
Tevfik Küçükömeroğlu, Semih Mahmut Aktarer, Güven İpekoğlu and Gürel Çam
From the journal Materials Testing

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

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