Torsional Behavior of AISI 420/AISI 4340 Steel Friction Welds

Sermin Ozan

doi:10.3139/120.110648

Article

Torsional Behavior of AISI 420/AISI 4340 Steel Friction Welds

Sermin Ozan

Published/Copyright: October 11, 2014

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From the journal Materials Testing Volume 56 Issue 10

Abstract

The solid-state friction welding method, which is widely used in the automotive, machinery, aviation and aerospace industry, was applied in this study. AISI 420 martensitic stainless steel, which is difficult to join by using fusion welding methods, and AISI 4340 tempered steel, which is commonly used in the automotive industry, were joined. During the welding process, three different rotations as 700, 1000 and 1300 rpm were used and parameters such as friction pressure, friction time, upset pressure as well as upsetting duration were kept constant. After the welding process, welded joints were examined macroscopically and microscopically, and their microhardness were measured. Then, torsion tests were performed on these samples. During the torsion tests, the samples fractured outside the welded joint regions. Thus, it was concluded that torsional strength of welded joint zones was high and AISI 420 and AISI 4340 steels were smoothly joined by friction welding.

Kurzfassung

Das Reibschweißen im festen Zustand, das breitflächig in der Automobilindustrie, im Maschinenbau sowie im Luft- und Raumfahrzeugbau angewendet wird, wurde in der diesem Beitrag zugrunde liegenden Studie untersucht. Hierzu wurde der martensitische Chromstahl AISI 420, der schwer mit Schmelzschweißverfahren zu verbinden ist, und ein angelassener Stahl AISI 4340, der im Automobilbau breitflächig eingesetzt wird, verbunden. Während des Schweißens wurden drei verschiedene Rotationsgeschwindigkeiten, und zwar 700, 1000 und 1300 U/min angewendet, wobei Parameter, wie der Reibdruck, die Reibzeit, der Stauchdruck und die Stauchdauer, konstant gehalten wurden. Nach dem Schweißen wurden die Verbindungen makroskopisch nund mikroskopisch untersucht sowie Härtemessungen durchgeführt. Anschließend wurde eine Torsionsprüfung durchgeführt. Dabei ergab sich, dass die Proben ausserhalb der Schweißnaht rissen, was ein Hinweis auf eine gute Torsionsfestigkeit der Schweißnaht ist. Im Ergebnis stellte sich heraus, dass die Stahlpaarung AISI 420 und AISI 4340 gut mittels Reibschweißen verbunden werden kann.

*Correspondence Address Sermin Ozan, Fırat University, Faculty of Technology, Dept. of Metals and Materials Engineering, Elazığ, Turkey, E-mail: serozan@firat.edu.tr

Dr. Sermin Ozan, born in 1970, received his BSc at the University of Firat, Faculty of Engineering, Machine Engineering Department, Elazig, Turkey, in 1994 and his MSc in 1998. In 2000, he achieved his PhD at the same university. His research areas comprise fusion welding, solid state welding, materials science, composite materials, powder metallurgy, manufacturing techniques, surface modification as well as nanotechnology.

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Published Online: 2014-10-11

Published in Print: 2014-10-01

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https://doi.org/10.3139/120.110648