The method of modeling spot welds has shown to be important in the accuracy of the frequency response analysis in the "mid frequency" range which is becoming a prime area of interest for many automotive manufacturers. Numerous manual techniques have been developed, each with a varying degree of success.

CDH has developed a fully automated method of generating a reasonably correct approach for modelling the spot welds and joint information.


It requires only a minimal amount of user interactions, i.e., defining some key parameters as well as providing a file containing the X, Y, and Z positions of the spot weld. This approach has been tested on several practical models and the results correlated well with the experimental data.

Since its first release, this approach has been widely used in automotive manufactories.  Advanced spotweld models, including influence-zone type and multi-layer type, have also been developed by CDH to capture the structural dynamics of spotwelds more accurately. These new modelling approaches provide enhanced features to adjust the stiffness of assembled structure. Moreover, Autospot has evolved itself to be capable of modelling various line joints to meet the need of industries for automated modelling processes in the virtual engineering.

  • Command line tool for automated and efficient modelling processing
  • Direct Import of spotweld and assembling information in VDA format
  • Full automated spot welding and glueing process
  • Automatic identification of connections
  • Spot weld modelling process is independent of the structure FE mesh
  • FE model of the spot welds such that the analytical responses as close as possible to the response of the actual vehicle or structure
  • Modify position and number of spot welds without changing the FE mesh of the structure
  • Various components can be modelled independently of each other, which lead to reduced modelling time
  • Extensive functions to handle the requirement such shrink and offset for assembling at edges
  • Stiffness tuning of assembled structures with user controlled influence-zone and support-zone for spotwelds
  • Supported joint elements
    • Spot Welds (four types)
    • Spotweld lines
    • Seam lines
    • Glue lines
    • Mastic Joints


Christian Pieper//
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