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The Effect of Electrode Shape and Force on the Contact Resistance of Spot Welded Joints

[+] Author Affiliations
Ugur Esme, AyCa Cakmak

University of Cukurova

Paper No. IMECE2005-79166, pp. 1403-1407; 5 pages
doi:10.1115/IMECE2005-79166
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Manufacturing Engineering and Materials Handling, Parts A and B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Manufacturing Engineering Division and Materials Handling Division
  • ISBN: 0-7918-4223-1 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

Contact resistance is an important parameter in the control of electrical spot welding. Here, a large current is passed through two water cooled copper electrodes which also clamp the sheets to be welded [1]. The contact resistance should not be too high, otherwise too much current is diverted to previously formed, neighbouring spot welds, and can make nugget formation difficult to control in the early part of the welding cycle. However, if it is too low, nugget formation is not completed at the interface. Therefore, the parameters that affect the contact resistance must be known and it must be compatible with the welding conditions [2]. The present paper reports the relationship between contact resistance, force, and electrode shape. A series of experiments were carried out using aluminium and steel specimens with different thicknesses to measure the faying surface and electrode-workpiece contact resistances.

Copyright © 2005 by ASME

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