Improved Temperature and Depth Control During FSW of Copper Canisters Using Feedforward Compensation
Författare
Redaktör
- Rajiv S. Mishra
- Murray W. Mahoney
- Yutaka Sato
- Yuri Hovanski
Summary, in English
In addition to the cascade controller adjusting the tool rotation rate, a depth controller is adjusting the axial force to control the shoulder depth. The purpose is to eliminate flash due to excessive shoulder depth and to control the position of the probe tip, which influeces the size and shape of the hook defect produced. Controlling depth is challenging for several reasons, including deflection in the welding machine and thermal expansion of the weld material, and also results in cross-coupling between axial force and spindle torque. The cross-coupling was handled by another feedforward compensator that adjusts the tool rotation rate based on the commanded axial force.
The implemented controllers and feedforward compensators have been evaluated over several welds with good results, where the depth is kept within ±0.1mm when the tool reaches the joint line sequence and the probe temperature is held within ±5°C during full circumferential welds compared to a process window of ±60°C.
Avdelning/ar
Publiceringsår
2016
Språk
Engelska
Sidor
69-76
Publikation/Tidskrift/Serie
Friction Stir Welding and Processing VIII
Dokumenttyp
Konferensbidrag
Förlag
John Wiley & Sons Inc.
Ämne
- Control Engineering
Nyckelord
- friction stir welding
- copper
- automatic control
- tool depth control
Conference name
Friction Stir Welding and Processing VIII
Conference date
0001-01-02
Status
Published
Forskningsgrupp
- LCCC
ISBN/ISSN/Övrigt
- ISBN: 9781119082491