i i Investigation on Formability of Tailor Welded Blanks prepared by Friction Stir Welding Process A DISSERTATION SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF MASTER OF TECHNOLOGY IN PRODUCTION AND INDUSTRIAL ENGINEERING Submitted by Subhajit Konar 2K17/PIE/15 Under the supervision of Dr. Vijay Gautam Professor (Mechanical Engineering Department) DEPARTMENT OF MECHANICAL ENGINEERING DELHI TECHNOLOGICAL UNIVERSITY (Formerly Delhi College of Engineering) Bawana Road, Delhi-110042 JULY, 2019