We are in to manufacturing of Orthopedic Implants by Investment Casting process since last two years. The castings are made from ss316L.
The castings are fully machined and many times we come across the defects seen after machining. Since it is an implant, we donot weld the defect and the castings are rejected.
Please suggest full proof NDT to screen out the castings with defects [seen after machining].