Characteristics of austenitic stainless steel T-joints welded using the DMAG process with solid wire

Tolga Mert; Nurullah Gultekin; Ahmet Karaaslan

doi:10.3139/120.110915

Article

Characteristics of austenitic stainless steel T-joints welded using the DMAG process with solid wire

Tolga Mert , Nurullah Gultekin and Ahmet Karaaslan

Published/Copyright: August 30, 2016

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From the journal Materials Testing Volume 58 Issue 9

Abstract

X 2 CrNi 18 9 austenitic stainless steel material with web and flange thickness of 6 mm was welded by conventional GMAW and double channel shielding gas method (DMAG) to form double fillet T-joints. The differences between these two methods were characterized by measurements of mean welding parameters, thermal camera temperature measurements, Vickers hardness profiles and bead geometries of the joints. Results show higher mean current but lower mean voltage using double channel shielding gas method. Vickers hardness differences between the two methods were insignificant. Moreover, molten mean filler metal area was larger with double channel shielding gas method, which depicted that welding speed for the same filler metal deposition could be increased and this could yield increased productivity.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurde ein hochlegierter austenitischer Stahl X 2 CrNi 18 9 mit einer Steg- und Flanschdicke von 6 mm mittels des konventionellen MAG-Schweißprozesses und einem Doppelkanal-MAG-Verfahren geschweißt, um Doppel-Kehlnähte herzustellen. Die Unterschiede der beiden Verfahren wurden mittels der wichtigsten Schweißparameter, Temperaturmessungen mittels Thermokamera, Vickers-Härteprofilen und der Schweißraupenabmessungen der Verbindungen charakterisiert. Die Ergebnisse zeigen bei dem Doppelkanal-Schutzgasverfahren eine höhere durchschnittliche Stromstärke, aber eine niedrigere Spannung. Die Differenzen in der Vickershärte waren für beide Verfahren nicht signifikant. Darüber hinaus war die Fläche des geschmolzenen Metalls beim Doppelkanal-Schutzgasschweißen größer, wodurch die Schweißgeschwindigkeit bei gleicher Zusatzwerkstoffeinbringung erhöht werden konnte und dies zu einer erhöhten Produktivität führte.

*Correspondence Address, Dr. Tolga Mert, Department of Mechanical Engineering, Yildiz Technical University, Yildiz Campus, 34349, Besiktas, Istanbul, Turkey, E-mail: tmert@yildiz.edu.tr, tolga_mert@yahoo.com

Dr. Tolga Mert, born in 1978, studied Mechanical Engineering at Istanbul University, Turkey from 1996 to 2000. After graduation, he pursued his Master of Science education in the, Mechanical Engineering Department, Materials Science and Manufacturing Technology Division, Yildiz Technical University, Istanbul, Turkey from 2001 to 2004. He has continued his career with doctorate education in the same department since 2005. He was awarded a Fulbright PhD Thesis Research Grant and pursued research on welding distortions at the Edison Joining Technology Center of Ohio State University, Columbus, USA, under the supervision of Prof. Dr. Chon L. Tsai from 2007 to 2008. He then earned his PhD degree in 2012. He has been working in the Mechanical Engineering Department, Materials Science and Manufacturing Technology Division, Yildiz Technical University as a research assistant since 2001.

Emeritus Prof. Nurullah Gultekin, born in 1943, graduated from Istanbul Technical College, Turkey in 1968 as a mechanical engineer. He has continued his Master of Science studies in the Mechanical Engineer Department of Yildiz University, Istanbul, Turkey, and graduated in 1970. From 1976 to 1978, he was at Schweisstechnische Lehr- und Versuchsanstalt, Mannheim, Germany for experimental studies for his Associate Professorship Adequacy thesis and earned his degree in 1979. He was promoted to Full Professorship in 1988. He retired in 2008 and since then, he has been giving lectures for undergraduate and graduate students in the Mechanical Engineering Department, Materials Science and Manufacturing Technology Division, Yildiz Technical University.

Prof. Dr. Dipl.-Ing. Mont. Ahmet Karaaslan, born in 1968, studied Metallurgy and Materials Engineering at Yildiz Technical University, Istanbul, Turkey from 1986 to 1990 and received his Doctoral degree from the Institute for Metals Science and Materials Testing at Montan University in Loeben, Austria in 1999. Since 1999, he has been working in the Materials Engineering Department at Yildiz Technical University in Istanbul.

References

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Published Online: 2016-08-30

Published in Print: 2016-09-07

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https://doi.org/10.3139/120.110915