Explore a comprehensive CFD simulation of the welding process, focusing on the application of variable heat flux to metal surfaces using User-Defined Functions (UDF). Observe the development of velocities as the applied heat flux melts the metal, and gain insights into the variable Marangoni stress effects. This 11-minute video tutorial by Shavan Technology provides a detailed walkthrough of the simulation process, offering valuable knowledge for engineers and researchers in the field of welding and computational fluid dynamics.