Loading...

Investigation of Friction Stir Welded Joints of 1050 Aluminium Alloy by Inserting Zn, Cu and Brass Foils

Mokabberi, Rouhollah | 2015

1480 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47806 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kokabi, Amir Hossein; Movahhedi, Mojtaba
  7. Abstract:
  8. Aluminum alloys are used in many industries because of its high strength to weight ratio. Due to many problems of fusion welding of aluminum alloys, In the past decade, much attention of scientists and craftsman has been directed towards friction stir welding (FSW) as a solid-state welding process. In this study, joint strength of butt friction stir welded wrought 1050 aluminum alloy with the thickness of 4mm increased by inserting pure copper foil (100 µm), pure zinc foil (250 µm), brass foil (100.250.500 µm) with chemical composition of 60wt% Cu and 40 wt% Zn. FSW was conducted at a tool traverse speed of 25 mmmin−1 and a rotational speed of 1200, 1600 and 2000 rpm. Results showed formation of intermetallic compound particles such as Cu9Al4 and Al2Cu, between aluminum matrix and Cu and matrix and brass foil, increased strength and hardness of stir zone about 50% and 80% respectively. The Zn foil didn't show any effect on strength of sitr zone. Place of fracture of weld joints without foil occurred at advancing side and for weld joints with foil occurred at retreating side in the stir zone because of more aggregation of IMC in retreating side. The maximum longitudinal strength of joint achieved in specimen with 100 µm brass foil with rotational speed of 1200 rpm. Also, Increasing rotational speed showed increasing macro defects influenced on decreasing of the joint strength that improved by second pass of friction stir welding
  9. Keywords:
  10. Commercial Pure Aluminum ; Friction Stir Welding ; Boass Foil ; Zinc Foil ; Copper Foil

 Digital Object List

 Bookmark

No TOC