TWIP (TWinning-Induced Plasticity) steels are a class of Mn-containing steels that display excellent elongation to fracture even at high strain rates, making them very attractive for energy absorbing components used in automotive construction. The main field of application of TWIP steels is automotive industry where car body parts are joined by means of welding. Therefore not only mechanical properties are factors of importance but also good weldability of TWIP steels is required. In the present study we will perform residual stress evaluation by neutron diffraction in welded joints of the types TWIP-TWIP, TWIP-DP (dual phase steel), and DP-DP. The results will be compared with our Crystal Plasticity Finite Element (CPFE) and FE-eigenstrain numerical models.