JWJ > Epub ahead of print
doi:https://doi.org/10.5781/JWJ.2018.36.2.9    [Epub ahead of print]
Microstructure and Mechanical Properties in the Friction Stir Welded C70600 Alloy
Sung-Wook Chung*, Tae-Jin Yoon**, Joong-Suk Noh***, Chung-Yun Kang**
*Welding Engineering R&D group, Daewoo shipbuilding & marine engineering Co., Ltd., Geoje, 53302, Korea
**Division of Materials Science and Engineering, Pusan National University, Busan, 46241, Korea
***Division of Engineering R&D, Hanjoo Metal Co., Ltd., Ulsan, 45010, Korea
Correspondence: Sung-Wook Chung  Email: chungsw@dsme.co.kr
Received August 21, 2017  Accepted March 5, 2018  Published online April 2, 2018
ABSTRACT
A friction stir welded (FSW-ed) C70600 alloy plate was partially welded to other C70600 alloy plate by the gas tungsten arc welding (GTAW). First, FSW was performed on the C70600 alloy by 2-steps (on the top and the bottom). The ultimate tensile strength after FSW was average 317MPa very close to that (average 324MPa) of GTAW-ed C70600 joint. The bending test results after FSW varied by the welding condition. Case A failed the bending test according to the ASME code (ASME Sec. IV) at the face bending because of relatively lower heat input (rotation speed/traveling speed was 600rpm / 200mm/min) while Case B (higher heat input; rotation speed/traveling speed was 1200rpm / 200mm/min) met the requirements. There were characteristic microstructures such as black-arc-arrays of the oxides in the FSW stir zone (SZ) and the micro-pores in the boundary between FSW-SZ and GTAW weld metal (WM). The former was originated from the crushed and stirred oxides which pre-existed on the base metal surface. The latter could result from re-gasified O2 gas formed by Cu oxides melted at the boundary between FSW-SZ and GTAW-WM.
Keywords: Copper alloy | Mechanical properties | Microstructure | SEM | Friction stir welding
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