A high-speed video imaging system was employed to directly measure the electrode displacement of the small scale resistance spot welding (SSRSW) process. This measurement technique was chosen because it eliminates a number of potential error sources inherent in other electrode displacement measuring techniques. Careful observation of the heating and cooling portions of the electrode displacement curves revealed that each is comprised of two identifiable segments. Distinct high-velocity segments of the displacement curves were thought to correspond to solid-liquid phase transitions in the weld nugget, while lower-velocity portions corresponded to thermal expansion or contraction of solid material. It was found that the magnitudes of the high speed portions of the electrode displacement were more closely correlated with the weld nugget thickness than was the overall magnitude of the electrode displacement. Furthermore, all measures of electrode displacement were more closely correlated to weld nugget thickness than to nugget diameter.
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Monitoring Resistance Spot Nugget Size by Electrode Displacement
D. F. Farson,,
D. F. Farson,
Industrial, Welding and System Engineering Department, The Ohio State University, Columbus, OH 43221
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J. Z. Chen,,
J. Z. Chen,
Industrial, Welding and System Engineering Department, The Ohio State University, Columbus, OH 43221
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K. Ely and,
K. Ely and
Industrial, Welding and System Engineering Department, The Ohio State University, Columbus, OH 43221
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T. Frech
e-mail: Farson.4@osu.edu
T. Frech
Industrial, Welding and System Engineering Department, The Ohio State University, Columbus, OH 43221
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D. F. Farson,
Industrial, Welding and System Engineering Department, The Ohio State University, Columbus, OH 43221
J. Z. Chen,
Industrial, Welding and System Engineering Department, The Ohio State University, Columbus, OH 43221
K. Ely and
Industrial, Welding and System Engineering Department, The Ohio State University, Columbus, OH 43221
T. Frech
Industrial, Welding and System Engineering Department, The Ohio State University, Columbus, OH 43221
e-mail: Farson.4@osu.edu
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received September 2003. Associate Editor: S. Jack Hu.
J. Manuf. Sci. Eng. May 2004, 126(2): 391-394 (4 pages)
Published Online: July 8, 2004
Article history
Received:
September 1, 2003
Online:
July 8, 2004
Citation
Farson, , D. F., Chen, , J. Z., Ely and , K., and Frech , T. (July 8, 2004). "Monitoring Resistance Spot Nugget Size by Electrode Displacement ." ASME. J. Manuf. Sci. Eng. May 2004; 126(2): 391–394. https://doi.org/10.1115/1.1644550
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