Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11697
Title: Influence of in-process cooling on tensile behaviour of friction stir welded joints of AA7039
Authors: Sharma C.
Dwivedi, Dheerendra Kumar
Kumar, Pradeep
Published in: Materials Science and Engineering A
Abstract: In this investigation, precipitation hardening Al-Zn-Mg alloy AA7039 was friction stir welded with and without in-process cooling in order to investigate the effect of in-process cooling on microstructure and tensile properties of the developed joints. The in-process cooling was employed using compressed air, liquid nitrogen and normal water. The effect of in-process cooling on the microstructure and mechanical properties of the weld joints was investigated by means of optical microscopy, tensile and microhardness tests. Fracture surfaces of the tensile tested weld joints were studied with a field emission scanning electron microscope (FE-SEM). The in-process cooling decreased the size of heat affected zones (HAZs) and thermo-mechanically affected zones (TMAZs) and also reduced the size of α aluminum grains in weld nugget zone (WNZ), TMAZs and HAZs. The hardness of the HAZ was found higher than WNZ and TMAZ of the joints developed with in-process cooling while reverse trend was observed for normal joints. In-process cooling with water was found to be more effective than other in-process cooling methods, and had ultimate tensile strength and percentage elongation equivalent to 73.5% and 86.8% of the base metal. In-process cooling changed the fracture location from heat affected zone to weld nugget zone. © 2012 Elsevier B.V.
Citation: Materials Science and Engineering A (2012), 556(): 479-487
URI: https://doi.org/10.1016/j.msea.2012.07.016
http://repository.iitr.ac.in/handle/123456789/11697
Issue Date: 2012
Keywords: Aluminum alloys
Friction stir welding
In-process cooling
Mechanical properties
ISSN: 9215093
Author Scopus IDs: 35622409000
7004266679
55952759400
Author Affiliations: Sharma, C., Mechanical and Industrial Engineering Department, Indian Institute of Technology, Roorkee, Uttarkhand 247667, India
Dwivedi, D.K., Mechanical and Industrial Engineering Department, Indian Institute of Technology, Roorkee, Uttarkhand 247667, India
Kumar, P., Mechanical and Industrial Engineering Department, Indian Institute of Technology, Roorkee, Uttarkhand 247667, India
Corresponding Author: Sharma, C.; Mechanical and Industrial Engineering Department, Indian Institute of Technology, Roorkee, Uttarkhand 247667, India; email: chaitanya.sharmaji@gmail.com
Appears in Collections:Journal Publications [ME]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.