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Three-dimensional friction stir welding of inconel 718 using the ESAB Rosio FSW-Robot
University West, Department of Engineering Science, Division of Automation and Computer Engineering. (PTW)ORCID iD: 0000-0001-9553-7131
2013 (English)In: ASM Proceedings of the International Conference: Trends in Welding Research, Chicago, IL, 2013, p. 829-833Conference paper, Published paper (Refereed)
Abstract [en]

Robotic Friction Stir Welding (FSW) facilitates for increased welding flexibility, and allows for studies of forces in three dimensions without having the high cost of a stiff 5-axes FSW machine. Recent developments in tool materials and welding equipment motivate this study on FSW of high-strength alloys by a robot in a three dimensional workspace. New concepts of aircraft engines suggest higher temperatures to increase engine efficiency, requiring more durable materials such as the nickel-based alloy 718. The ESAB Rosio™ FSW robot, used in this study, can deliver up to 15kN downforce and 90Nm torque. This is sufficient for welding high-strength alloys of limited thickness. This study focuses on the process forces during friction stir welding of Inconel 718 with thickness up to 3mm in butt-joint configuration. A newly developed threaded Poly-Crystalline Boron Nitride (PCBN) tool with convex shoulder is used in a local argon-shielded atmosphere. Initial tests are performed in a stiff FSW machine in position controlled mode. The measured process forces in position control are later on used as parameters on the force-controlled robot. Different backing bar materials are investigated with the aim to decrease the risk of root defects. Tool steel and regular inconel backing bars are proven to be too soft for this purpose and alternatives are suggested. The optimal welding parameters are tuned to combine a good weld quality with the process forces that can be obtained by the robot. Preheating is used to further decrease the need of high process forces. Copyright © 2013 ASM International® All rights reserved.

Place, publisher, year, edition, pages
Chicago, IL, 2013. p. 829-833
Keywords [en]
Backing bar, Force control, Friction stir welding, Inconel 718, Nickel alloy, Preheating, Robot, Work-integrated Learning, WIL
Keywords [sv]
AIL
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-5568Scopus ID: 2-s2.0-84880692600ISBN: 9781627089982 (print)OAI: oai:DiVA.org:hv-5568DiVA, id: diva2:642602
Conference
9th International Conference on Trends in Welding Research; Chicago, IL; United States; 4 June 2012 through 8 June 2012; Code 97902
Available from: 2013-08-22 Created: 2013-08-13 Last updated: 2018-07-25Bibliographically approved

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De Backer, Jeroen

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