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Science and Technology of Welding and Joining Volume 17, 2012 - Issue 4
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Periodic variation of torque and its relations to interfacial sticking and slipping during friction stir welding

J W QianState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an710072, China;Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an710072, China
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J L LiShaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an710072, ChinaCorrespondence[email protected]
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J T XiongShaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an710072, China
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F S ZhangShaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an710072, China
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W Y LiShaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an710072, China
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X LinState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an710072, China
Pages 338-341 | Received 22 Nov 2011, Accepted 10 Jan 2012, Published online: 12 Nov 2013
 
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Abstract

The fraction of slipping between the tool and the workpiece during friction stir welding was calculated based on the measured torque and axial force with a sampling frequency of 1000 Hz. The results showed that the torque and fraction of slipping present a variation with the same periodicity that is equal to the time of one tool rotation. A model was proposed to present the average slipping fraction under different process parameters. The variation of the contact condition between the tool and the workpiece in one rotation was explained.

This work has been supported by the National Natural Science Foundation of China (grant nos. 51071123, 51005180 and 51101126), the fund of the State Key Laboratory of Solidification Processing in NWPU (grant nos. 31-TP-2009, 43-QP-2009 and 69-QP-2009) and the 111 Project (grant no. B08040).

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