COMPUTATIONAL WELDING MECHANICS

Distributed Heat Source Models

The first second Generation models define a distributed heat source function. The best known example of such a function is the double ellipsoid model, see Figure 2-9. Another example is a conical model for deep penetration electron or laser beam welds, see Figure 2-11. These were the first weld heat source model capable of simulating welds with deep penetration. Linear combinations of such ellipsoidal, conical or other shapes can be used. If one knows the ’’exact” temperature solution, then one can substitute it in the energy equation to determine the “exact” distributed heat source function directly. Thus the distributed heat source function exists whenever the temperature solution in the weld pool region exists. However for weld pools with complex shapes, it can be very difficult to determine the distributed heat source function if the temperature distribution in the weld pool is not known.

Because of the discrete FEM mesh, one should constrain the net heat input of the weld heat source model to equal the net heat input of the weld. This is easily done by scaling the load vector for the heat source model.

The FEM mesh can conform to the weld pool boundary but it need not conform.

COMPUTATIONAL WELDING MECHANICS

Fracture Mechanics of Welded Structures

For fracture mechanics the location and geometry of the crack or defect must be specified as input data. The crack geometry could be specified as an ordered set of points …

Material Properties Summary

Properties can be provided for a material or alloy or for a specific phase in a material or alloy. If properties are provided for a specific phase, then the macroscopic …

Weld Pool Solver

If there is a weld pool solver that computes the weld pool free surface, velocity and temperature in the weld pool and weld pool reinforcement, the input data should include …

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