A Presentation onEffect of Friction Stir Welding on mechanical properties and formability of thin commercial Al blanks Submitted by Manish Singh (2011MEP3270) Under the guidance of Dr. S. Aravindan and Dr. D. Ravi Kumar Department of Mechanical Engineering Indian Institute of Technology, Delhi
Friction stir welding : FSW is a solid–state, hot–shearjoining process in which a rotating tool with a shoulder movesalong the butting surfaces of two rigidly clamped plates placed ona backing plate as shown in Fig. Schematic illustration of the Friction Stir Welding process.
Limiting Dome Height Test of FS Welded Samples Welding Weld Run No. LDH Test Samples LDH (mm) Remarks parameters Rotational Failure Speed = 450 occurs from 11.04 rpm weld centre Welding line Run No. 1 Speed = 80 mm/min Failure Shoulder occurs from 13.76 Diameter = 8 TMAZ/HA mm Z
WeldingWeld Run No. LDH Test Samples LDH (mm) Remarks parameters Rotational Speed = 560 Failure occurs rpm 12.72 from Welding TMAZ/HAZ Speed = 160 Run No. 4 mm/min Shoulder Failure occurs Diameter = 11.32 from Weld 8 mm centre line Welding parameters
Welding LDHWeld Run No. LDH Test Samples Remarks parameters (mm) Failure Rotational occurs in Speed = 710 12.04 Weld centre rpm line Welding Run No. 7 Speed = 250 mm/min Failure Shoulder occurs from Diameter = 8 14.28 Weld centre mm line
Tensile test Weld Nugget Tensile Sample along the Weld Weld Centre Line Tensile Sample Transverse to the Weld Hardness Sample Transverse to the Weld
Conclusion:1. Hardness in advancing side is more than the retreating side in HAZ and TMAZ because the grain refinment is more in advancing side than retreating side.2. From the LDH tests, it is observed that LDH in run 7(710 rpm, 250 mm/min, 8mm) is higher than the LDH in run 1(450 rpm, 160 mm/min, 8mm) and run 4(560 rpm, 160 mm/min, 8mm). As formability strongly depends on mechanical properties of the welded blank, further tests (tensile tests and LDH tests) have to be carried out to draw the conclusions.3. In LDH tests the failure occurred in the weld region in some samples and in HAZ/TMAZ in other samples.
Work done till now Time1. To study the literature and see the various aspect of project 25thJuly - 15th February2. Weld specimen preparation by friction stir welding process. 10th January- 25th January3. To study the micro-structure of weld specimen 25th January- 5th February4. Performance of micro hardness test and LDH test. 5th February - 18th February5. Report writing. 15th February -20th FebruaryWork to be done1. Weld specimen for remaining runs is going to be prepared.2. LDH tests and microhardness tests will be performed after that.
Gantt chart Time June Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May ActivityLiteraturereviewSetuppreparationTWBspreparation byFSWSamplepreparation &MechanicaltestingForming testReportwriting