Innovative Technique Enables Bubble-Preserving Metal Foam Welding

Researchers at North Carolina State University have developed a welding technique called induction welding that can join composite metal foam (CMF) components without compromising their desirable properties. CMFs, which consist of hollow metallic spheres embedded in a metallic matrix, are lightweight, strong, and effective at insulating against high temperatures. Traditional welding methods using direct heat melt the metal and fill in the porosity of CMF, impairing its properties. However, induction welding uses an electromagnetic field to heat the metal, allowing for a good weld while preserving the CMF's properties. This advancement opens up possibilities for various applications, including aircraft wings, vehicle armor, and storing heat-sensitive materials.