Defining Weld Line Sets

You can define a weld line set to describe locations where two or more welds meet.

Note: Many parameters in the Weld Fillet Set dialog box are populated by default settings stored in the Weld Defaults dialog box. You can select Use default while defining a weld feature to specify the behavior defined in the weld defaults.

This task shows you how to:

Before you begin: You must have a role that provides access to Verity weld simulations. For the latest information on roles and the apps to which they provide access, see the Program Directory.
See Also
About Weld Line Sets

Define the Methodology and Structural Stress Type for Weld Line Sets

  1. From the Durability section of the action bar, click Weld Line Set .
  2. Optional: Enter a descriptive Name.
  3. In the Support box, specify the location of the weld line set.
  4. From the Weld line filter options, select None to choose the entire location specified in the Support box, or select Specify to refine the location you want to analyze.
  5. From the Methodology options, select Verity™.
  6. From the Material options, specify the material definition and the behavior for the weld line set.
  7. From the Structural stress type options, select one of the following:
    OptionDescription
    Normal Structural stress normal to the weld lines.
    Shear Structural stress parallel to the weld lines.
    Worst of normal/shear Worse fatigue life computed from the normal and shear structural stress histories.
    Multiaxial Advanced multi-axial weld fatigue: Wang & Brown-based multiaxial cycle counter with blending of normal and shear S-N master curves
  8. From the Structural stress source options, select one of the following:
    OptionDescription
    Basic nodal force Standard Battelle structural stress method. This method requires very highly structured meshes be created on the crack surfaces.
    Enhanced nodal force Enhanced nodal force structural stress method. This method requires that the crack surfaces be modeled accurately but the mesh over that surface can be unstructured.
  9. From the l(r) function options, select one of the following:
    OptionDescription
    Displacement control "Structural Joints / Displacement Control" method for defining the function of the bending ratio, r .
    Load control "Small Details / Load Control" method for defining the function of the bending ratio, r .
  10. From the Mean stress correction options, specify one of the following models to describe mean stress correction for the selected weld line set:
    OptionDescription
    None No mean stress correction.
    User file Performs mean stress correction based on user-specified data in a file in the database.

    The material used for the welds must have ultimate tensile strength defined.
    ASME Tensile ASME Tensile method.

    The material used for the welds must have monotonic yield stress defined.

    Modified Goodman (compressive only) Modified Goodman method, suitable for brittle materials and welds.

    The material used for the welds must have ultimate tensile strength defined.

    Battelle - Low Residual Battelle - Low Residual method
    Battelle - Compressive Residual Battelle - Compressive Residual method
  11. Click OK.

Specify the Failure Mode for Weld Line Sets

  1. From the Durability section of the action bar, click Weld Line Set .
  2. From the Failure Mode options, specify whether you want to perform toe failure, throat failure, fusion failure, or root failure for the weld line set.
  3. For throat failures or fusion failures, specify the Failure sense:
    OptionDescription
    From root or surface Analyzes failures from the root to the surface line and vice versa.
    From root Analyzes failures from the root to the surface line only.
    From surface Analyzes failures from the surface line to the root only.
  4. Specify whether the app detects the Crack surface automatically or whether you want to override it and specify the crack surface manually. For the override option, select the crack surface from the 3D area.
  5. Click OK.

Specify Advanced Behavior for Weld Line Sets

  1. From the Durability section of the action bar, click Weld Line Set .
  2. Specify the Number of smoothing iterations you want to perform smoothing on the stress with respect to distance along the weld lines.

    By default, the app performs no smoothing iterations, but you can specify up to 10.

  3. Specify the Weld line split angle, which determines how long weld lines with kinks in them are split into separate segments.
  4. From the Plate thickness options, select one of the following:
    OptionDescription
    Auto detect Detects the plate thickness automatically.
    Capped depth Specifies a maximum depth for the plate thickness.
    Fixed depth Specifies a fixed depth for the plate thickness.
  5. Specify the Failure plane tolerance, a tolerance in degrees for the angle between the assumed failure plane normal and that of a candidate element face.
  6. Specify the Blunt root threshold, which controls the handling of the weld root lines where there is a small gap in the model between the base plate and the back of the weld line set.
  7. From the Verity weld end correction options, select one of the following:
    OptionDescription
    Virtual node and rescaled ends Uses Battelle’s recommended Mod1 weld end correction, which can reduce the structural stress and weld ends where there are further parent plate elements beyond the end of the line.
    Virtual node Uses the original weld end correction, which forces a 90 degree angle around all weld ends.
    None Performs no weld end correction.
  8. If you want to exclude specific weld ends from weld end correction, do the following:
    1. From the Excluded ends options, select Selected ends.
    2. Select the vertices that you want to exclude from the weld end correction.
  9. Click OK.