Dr. Wei Tang is an R&D staff member in the Materials Science and Technology Division at Oak Ridge National Laboratory. He received his PhD in Mechanical Engineering, with specialization in Welding, from Xi’an Jiaotong University, Shaanxi, China, in 1995. Since then, he has performed R&D at universities and at the national laboratory as a post doctorate, research associate, professor, and staff member. His research interests include material-additive manufacturing, welding and processing—especially friction stir welding and processing—microstructure characterization, mechanical property evaluation, and residual stress characterization. Currently, he is a member of the American Welding Society (AWS) and a member of the technical paper committee (TPC) of AWS.