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Repair of Defective FSW Butt Joints

Biallas, Gerhard and Ostersehlte, Hartmut and Dreßler, Ulrike (2010) Repair of Defective FSW Butt Joints. In: Proc. 8th International Symposium on Friction Stir Welding, 18.-20. Mai 2010, Timmendorfer Strand. 8th International Symposium on Friction Stir Welding, 18.-20. Mai 2010, Timmendorfer Strand, Deutschland.

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Abstract

Within the ADO (Airbus-DLR-ONERA research cooperation funded by Airbus) FSW project, scenarios for repairing FSW joints that had turned out to be defective were developed. In the present paper, full-length re-welding of the complete joint line and resulting change in mechanical behaviour was examined. The work was performed on defective butt welds intentionally made at Airbus Operations GmbH in Bremen. At DLR, defective and repaired FSW joints were checked by high frequency ultrasonics and electrical conductivity measurements through the eddy current technique. Mechanical behaviour was characterised in terms of bending, tensile and S-N tests. Defective FSW joints could completely be repaired by a single re-welding process. A second re-welding was not observed to generate any kind of improvement. Conversely, it slightly reduced strength and ductility. The decrease in strength was the lowest for 2024-T3. 2198-T8 and 6156-T6 took a less favourable position, since the artificially aged tempers exhibited higher sensitivity towards additional thermal cycles. However, strength in double repair condition should also be acceptable for these alloys, since weld efficiency never decreased below 72% even for two-pass repair throughout the present study.

Document Type:Conference or Workshop Item (Speech)
Title:Repair of Defective FSW Butt Joints
Authors:
AuthorsInstitution or Email of Authors
Biallas, GerhardHAW Hamburg
Ostersehlte, HartmutAirbus Operations GmbH Bremen
Dreßler, Ulrikeulrike.dressler@dlr.de
Date:May 2010
Journal or Publication Title:Proc. 8th International Symposium on Friction Stir Welding, 18.-20. Mai 2010, Timmendorfer Strand
Status:Published
Keywords:FSW Friction Stir Welding Repair Ultrasonic Testing
Event Title:8th International Symposium on Friction Stir Welding
Event Location:Timmendorfer Strand, Deutschland
Event Type:international Conference
Event Dates:18.-20. Mai 2010
Organizer:The Welding Institute
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Ulrike Dreßler
Deposited On:02 Dec 2010 14:02
Last Modified:02 Dec 2010 14:02

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