Cold spraying

Bob Allegretto, NU Cold Spray & Automation Technician, prepares to adhere aluminum together in the Cold Spray lab inside The George J. Kostas Research Institute for Homeland Security on Jan. 11, 2018. Photo by Matthew Modoono/Northeastern University

Bob Allegretto, a cold spray and automation technician, prepares to adhere aluminum together in a lab at Northeastern’s George J. Kostas Research Institute for Homeland Security in Burlington, Massachusetts, on Wednesday afternoon. Photo by Matthew Modoono/Northeastern University