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The purpose of the presented model is the numerical simulation of the electron beam welding of metal matrix composites regarding heat transfer, phase change, and fluid and particle flow in the weld pool. The governing equations for the 3D, transient, incompressible heat and fluid flow are therefore extended by a phase change model and a heat source. Furthermore, Lagrangian particle tracking is used for the dispersed particle phase. The implementation of this model into OpenFOAM ensures reusability and expandability for further applications and refinements. [ABSTRACT FROM AUTHOR]