Effect of welding processes on mechanical and microstructural properties of S275 structural steel joints
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Bekir Çevik
Abstract
S275 structural steel is a popular low carbon steel type that can be used in many different general engineering and structural applications. These steels are widely used in steel construction, maintenance, machinery and manufacturing industries. Welded joints of this steel used in the mentioned industrial areas are important. In this study, 10-mm thick S275 structural steel sheets were joined by using gas metal arc welding (GMAW) and flux cored arc welding (FCAW) methods. Tensile, bending, and hardness tests were performed to determine the mechanical properties of the welded samples. In addition, metallographic investigations were carried out to determine the microstructural properties of the weld zones. As a result of the microstructural studies, it was found that different structures such as grain boundary ferrites, polygonal ferrites, Widmanstatten ferrites and acicular ferrites are formed in the weld metal and coarse-grained region. It was determined that the hardness of the weld metal was higher than HAZ and base metal in all welding parameters. The highest tensile and bending strengths were obtained from those samples joined by using the FCAW method. As a result of the tensile test, separation occurred in the transition region between the weld metal coarse-grained regions.
Kurzfassung
S275 ist ein kohlenstoffarmer Baustahl, der im allgemeinen Maschinenbau und für konstruktive Anwendungen eingesetzt werden kann. Dieser Stahl wird häufig im Stahlbau, in der Instandhaltung und in der Fertigungsindustrie verwendet. Die Schweißverbindung ist dabei von besonderer Bedeutung. In dieser Studie wurden 10 mm dicke Bleche aus S275 mit dem Schutzgasschweißen (GMAW) und Fülldrahtschweißen (FCAW) verbunden. Zug-, Biege- und Härteprüfungen wurden durchgeführt, um die mechanischen Eigenschaften der Schweißproben zu bestimmen. Darüber hinaus wurden metallografische Untersuchungen zur Bestimmung der mikrostrukturellen Eigenschaften der Schweißzonen durchgeführt. Als Ergebnis der mikrostrukturellen Untersuchungen wurde festgestellt, dass verschiedene Strukturen wie Korngrenzenferrite, polygonale Ferrite, Widmanstättengefüge und nadelförmige Ferrite im Schweißgut und in der Grobkornzone auftreten. Es wurde festgestellt, dass die Härte des Schweißgutes für alle Schweißparameter höher war als die der Wärmeeinflusszone und die des Grundwerkstoffes. Die höchsten Zug- und Biegefestigkeiten wurden für das Fülldrahtschweißen erzielt. Der Zugversuch zeigte, dass eine Trennung im Übergangsbereich zwischen den grobkörnigen Zonen auftrat.
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© 2018, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Compression testing of additively manufactured continuous carbon fiber-reinforced sandwich structures
- Microstructure and mechanical properties of nano-carbon reinforced Cu-based powder metallurgy friction materials produced by hot isostatic pressing
- Thermo-mechanical testing of TiO2 functional coatings using friction stir processing
- Ternary melt blend based on poly (lactic acid)/chitosan and cloisite 30B: A study of microstructural, thermo-mechanical and barrier properties
- Untersuchungen zur verlässlichen Messung der Härte nach dem UCI – Verfahren (Ultrasonic Contact Impedance)
- Electrochemical impedance spectroscopy of sand of varied particle size and water content using the three-electrode system
- Recycling of LM25 aluminum alloy scraps
- Mechanical fracture characterization of adhesive interfaces: Introducing a new concept for evaluating adhesive quality
- Effect of welding processes on mechanical and microstructural properties of S275 structural steel joints
- Essential Work of Fracture: Bestimmung des gültigen Ligamentbereiches mittels digitaler 3D-Bildkorrelation
- Synthesis, properties and EDM behavior of 10 wt.-% ZrB2 reinforced AA7178 matrix composites
- Solid particle erosion wear behavior of severe plastically deformed AA7075 alloys
- Performance of coated and uncoated carbide/cermet cutting tools during turning
- Assessment of soft materials for anthropomorphic soft robotic fingertips
- Application of the grey based Taguchi method and Deform-3D for optimizing multiple responses in turning of Inconel 718
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Compression testing of additively manufactured continuous carbon fiber-reinforced sandwich structures
- Microstructure and mechanical properties of nano-carbon reinforced Cu-based powder metallurgy friction materials produced by hot isostatic pressing
- Thermo-mechanical testing of TiO2 functional coatings using friction stir processing
- Ternary melt blend based on poly (lactic acid)/chitosan and cloisite 30B: A study of microstructural, thermo-mechanical and barrier properties
- Untersuchungen zur verlässlichen Messung der Härte nach dem UCI – Verfahren (Ultrasonic Contact Impedance)
- Electrochemical impedance spectroscopy of sand of varied particle size and water content using the three-electrode system
- Recycling of LM25 aluminum alloy scraps
- Mechanical fracture characterization of adhesive interfaces: Introducing a new concept for evaluating adhesive quality
- Effect of welding processes on mechanical and microstructural properties of S275 structural steel joints
- Essential Work of Fracture: Bestimmung des gültigen Ligamentbereiches mittels digitaler 3D-Bildkorrelation
- Synthesis, properties and EDM behavior of 10 wt.-% ZrB2 reinforced AA7178 matrix composites
- Solid particle erosion wear behavior of severe plastically deformed AA7075 alloys
- Performance of coated and uncoated carbide/cermet cutting tools during turning
- Assessment of soft materials for anthropomorphic soft robotic fingertips
- Application of the grey based Taguchi method and Deform-3D for optimizing multiple responses in turning of Inconel 718
