PSI - Issue 17

Available online at www.sciencedirect.com Structural I tegrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 17 (2019) 495–502

ICSI 2019 The 3rd International Conference on Structural Integrity Tensile strength and failure of dissimilar friction stir welded joints between 6061-T6 and 2014-T6 aluminum alloys Madhav Raturi a , Ashu Garg a, *, Anirban Bhattacharya a a Mechanical Engineering Department, Indian Institute of Technology Patna, Bihta, 801103, India The present study is attributed towards better tensile and impact properties of friction stir welded joints between AA6061-T6 and AA2014-T6 alloys with minimum or no void formation. Two different tool pin profiles, threaded with three intermittent flat faces (TIF) and truncated square pyramidal shaped (TPZ) tool pins were selected. Dissimilar joining was carried out using different combinations of tool rotation (660, 900, 1200 rpm) and welding speeds (36, 63, 98 mm/min). Results revealed that for TIF tool pin, the maximum joint tensile strength was achieved at tool rotational speed of 1200 rpm with welding speed of 98 mm/min. On contrary, the maximum impact energy was recorded for joints prepared with TPZ tool pin at 900 rpm tool rotation and 63 mm/min welding speed. Detailed metallurgical characterization of different weld zones and fractographic studies were also performed and discussed. ICSI 2019 The 3rd International Conference on Structural Integrity Tensile strength and failure of dissimilar friction stir welded joints between 6061-T6 and 2014-T6 aluminum alloys Madhav Raturi a , Ashu Garg a, *, Anirban Bhattacharya a a Mechanical Engineering Department, Indian Institute of Technology Patna, Bihta, 801103, India Abstract The present stud is attributed towards better tensile a d impact properties of friction stir wel joints b tween AA6061-T6 and AA2014-T6 alloys with minimu or no void formation. Two diff r nt tool pin profiles, threaded ith three intermitte t flat faces (TIF) and truncated squ re pyramidal shaped (TPZ) tool pins were selected. Dissimilar joining was carried out using different combinations of tool rotation (660, 900, 1200 rpm) and welding speeds (36, 63, 98 mm/min). Results rev aled that for TIF tool pin, the maximum joint tensile strength was achieved at tool rotational speed of 1200 rpm with welding speed f 98 mm/min. On contrary, the maximum impact energy was recorded for joints prepared with TPZ tool pi at 900 rpm tool rotation and 63 mm/min wel ing speed. Detailed metallurgical characterization of different weld zones and fractographic studies were also performed and discussed. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: Friction stir welding; Tool pin profiles; Microstructure; Strength, Failure Keywords: Friction stir welding; Tool pin profiles; Microstructure; Strength, Failure

1. Introduction 1. Introduction

Friction stir welding (FSW) has successfully emerged as a promising solid-state joining process to join dissimilar metals and alloys. The FSW process was developed and patented by TWI, Cambridge (Thomas et al., 1991). Conventional fusion welding is not always endorsed as a desirable joining process for aluminum alloys due to their poor solidification microstructure and porosity (Mishra and Ma, 2005). Therefore, in many applications FSW process is used for joining of different aluminum alloys. The tool used in FSW executes two important operations Friction stir welding (FS ) has successfully emerged as a promising solid-state joining process to join dissimilar metals and alloys. The FSW process was developed and patented by TWI, Cambridge (Thomas et al., 1991). Conventional fusion welding is not always endorsed as a desirable joining process for aluminum alloys due to their poor solidification microstructure and porosity (Mishra and Ma, 2005). Therefore, in many applications FSW process is used for joining of different aluminum alloys. The tool used in FSW executes two important operations

* Corresponding author. Tel.: +91-612-302-8082. E-mail address: ashu.pme16@iitp.ac.in * Correspon ing aut or. T l.: +91-612-302-8082. E-mail address: ashu.pme16@iitp.ac.in

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.065