In this work, a 3D thermal 🔥 and mass diffusion 💧 analysis was performed using DC3D8 elements in Abaqus. A user-defined heat source was implemented via the DFLUX subroutine ⚙️ to simulate the welding process accurately. The heat transfer step consisted of welding (40 seconds) and cooling (800 seconds), followed by a mass diffusion step using the temperature field as input to model hydrogen migration in the base and weld metal.

Temperature-dependent material properties such as Diffusivity 📈 and Solubility 🧪 were defined, and the Kappa parameter was used to account for chemical potential-driven transport 🔄.

Key results like hydrogen concentration (CONC) 🟡 and mass flux (MFL) 🔵 were extracted from the ODB file and visualized as contour plots over time 🕒. This analysis helps identify regions at risk of hydrogen embrittlement ⚠️.

📚 For more details, please refer to the Abaqus documentation.
💬 Feel free to share your thoughts or similar experiences!