|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Friction Stir Welding and Processing IX
||Depth and Temperature Control during Friction Stir Welding of 5 cm Thick Copper Canisters
||Lars Cederqvist, Olof Garpinger
|On-Site Speaker (Planned)
Welding canisters requires variable power to control the probe temperature. By using a cascaded loop that determines the power requirement, the controller won´t be dependent on repeatability in the power, and the lagtime in the temperature won´t be critical. The cascade controller result in a probe temperature within ±5°C of the desired value (845°C) during full circumferential welds compared with a process window of ±60°C. A depth controller is adjusting the axial force to control the shoulder depth. The purpose is to eliminate flash and to control the probe tip position, which affects the hook defect. The controller was verified during 13 separate cycles in lid and tubes with different material properties. Although the shoulder depth varied more than 3.3 mm between cycles during the plunge, the controller was able to achieve the desired shoulder depth of 2.2 mm for both these cycles as the joint line was reached.
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