Mr. Mincheol Shin
,
Korea Aerospace Research Institute, Daejeon, Korea, Republic of (South)
Mr. Sanghoon Lee
,
Korea Aerospace Research Institute, Daejeon, Korea, Republic of (South)
Mr. Joontae Yoo
,
Korea Aerospace Research Institute, Daejeon, Korea, Republic of (South)
Mr. Chunghee Park
,
Korea Aerospace Research Institute, Daejeon, Korea, Republic of (South)
Mr. Jonghoon Yoon
,
Korea Aerospace Research Institute, Daejeon, Korea, Republic of (South)
Mr. Hosung Lee
,
Korea Aerospace Research Institute, Daejeon, Korea, Republic of (South)
Mr. Yeonhee Jung
,
Korea Aerospace Research Institute, Daejeon, Korea, Republic of (South)
Dr. Ricky Whelchel
,
Constellium Aerospace and Transportation, Ravenswood, WV
Mr. Michael Niedzinski, FASM
,
Constellium LLC, South Barrington, IL
Mr. Julien Laye
,
Constellium C-TEC, Voreppe, France
Dr. Jean-Christophe Ehrstrom
,
Constellium CTEC, Voreppe, France
In order to develop a new industrial process route for spun formed components usable for spacecraft structures, Friction Stir welding process was developed. The main reason for this development is the future need for dome dimensions that are beyond the existing rolling mill capabilities.
Spin Forming of large components also require formable material, therefore 2219 was used in O temper.
The complete process envisioned is:
- Elaboration of 2219 – O plates
- Friction Stir welding
- Annealing
- Spin forming
- Solution heat treatment of the formed part and quench
- Artificial ageing
For this project, Constellium ISSOIRE delivered the plates, Constellium Technology Center (C-TEC) and KARI developed the FSW procedure for one side and two sides welding on 15 16mm thick plates.
Ultrasonic testing and radiography were used to asses the quality of the welds on coupons and on large demonstrators. Mechanical characterization was also performed in order to assess that the welded components ductility was sufficient for spin forming afterward.
An annealing treatment was also defined in order to deliver the best behavior of the blank to be formed.
Finally, several large demonstrators were delivered to KARI in order to perform spin forming and final heat treatment.
