Ultrasonic Characterization of Spot Welds

  • F. Nadeau
  • C. Néron
  • J. F. Bussière


Resistance welding is one of the most widely used joining processes in industry. Basically, it uses mechanical pressure and high intensity current to hold and weld sheet metal assemblies. The bond is assured by the presence of a “weld nugget”, a volume common to both sheets which melts and resolidifies during the operation. The most common application is automotive engineering where many of the sheet steel components are spot welded1. It is also used in other fields such as the aerospace industry and with other materials such as aluminum or magnesium alloys, copper, nickel, etc.2. As any other industrial process, a whole area of technologies has evolved along with resistance welding to meet requirements of quality assurance via either process control or product testing. The major breakthroughs are on the side of process control where much of the research efforts have been concentrated. Parameters such as current and time can now be dynamically controlled through adaptive feedback mechanisms using sensors that measure electrical resistance,3,4 displacement,5 infrared radiation,6 ultrasonic transmission7 and even acoustic emission.8 As for testing, most of it is still done destructively. A common method is the peel test where a sample weld is simply pulled apart: if the weld is good, one of the sheets will tear around the nugget whose width can then be measured.


Acoustic Emission Spot Weld Parent Metal Resistance Spot Weld Penetration Weld 
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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • F. Nadeau
    • 1
  • C. Néron
    • 1
  • J. F. Bussière
    • 1
  1. 1.Industrial Materials Research InstituteNational Research Council CanadaBouchervilleCanada

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