Formation of joining mechanisms in friction stir welded dissimilar Al-Ti lap joints

Markus Krutzlinger, Roland Marstatt, Sahin Suenger, Johannes Luderschmid, Michael Friedrich Zaeh, Ferdinand Haider

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

12 Scopus citations

Abstract

Friction Stir Welding (FSW) is a suitable technology for joining dissimilar materials. As the process temperature during FSW typically does not exceed the solidus temperature, like in fusion welding, high quality joints can be produced with a minimum of intermetallic phases. A comprehensive description of the effective joining mechanisms of friction stir welded dissimilar material joints is still subject of research. In this study the results of an analysis of the effect of the pin length, which is supposed to have a significant influence on the characteristics of the joining mechanisms, are presented. Especially the influence on the bonding conditions and the mechanical properties of the joints has been investigated. For this purpose combinations of aluminum and titanium have been welded with varying pin length at different rotational speeds. The experiments show that at a sufficient distance between the interface zone and the pin tip the bonding is realized by a substance-to-substance bond and microscopic form-fit. As this distance decreases, a visible macroscopic form-fit is generated. However, this macroscopic form-fit causes no significant elevation of the joint strength. First scanning transmission electron microscopy (STEM) images reveal an interfacial layer, which indicates a diffusion of the two materials.

Original languageEnglish
Title of host publicationTribology in Manufacturing Processes and Joining by Plastic Deformation
PublisherTrans Tech Publications Ltd
Pages510-520
Number of pages11
ISBN (Print)9783038351276
DOIs
StatePublished - 2014
Event6th International Conference on Tribology in Manufacturing Processes and Joining by Plastic Deformation, ICTMP 2014 - Darmstadt, Germany
Duration: 22 Jun 201424 Jun 2014

Publication series

NameAdvanced Materials Research
Volume966-967
ISSN (Print)1022-6680
ISSN (Electronic)1662-8985

Conference

Conference6th International Conference on Tribology in Manufacturing Processes and Joining by Plastic Deformation, ICTMP 2014
Country/TerritoryGermany
CityDarmstadt
Period22/06/1424/06/14

Keywords

  • Aluminum EN AW-1050
  • Aluminum EN AW-6082
  • Dissimilar material combination
  • Friction stir welding
  • Joining mechanism
  • Lap joints
  • Titanium grade 1
  • Titanium grade 5

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