Accession Number : AD0714221

Title :   The Nature and Formation of the Bond in the Explosive Bonding of Metals.

Descriptive Note : Technical research rept.,

Corporate Author : FRANKFORD ARSENAL PHILADELPHIA PA

Personal Author(s) : Kowalick,James F. ; Hay,D. Robert

Report Date : JUN 1970

Pagination or Media Count : 123

Abstract : Wave formation in explosive bonding is viewed as a special case of the transition from laminar to a turbulent metal flow regime set up along the collision region between two metal interfaces. Employing a novel semicylinder technique developed specifically for this investigation, dynamic parameters of the process are used to determine Reynolds numbers for dynamic metal flow. These are correlated with conditions for obtaining wavy bonded interfaces between metals, the most desirable type of bonding from the standpoint of obtaining superior mechanical properties. A Reynolds number range of 0.38 to 14.7 is established as a necessary and sufficient criterion for explosive bonding. The explosive bonding mechanism is described by using a viscous flow model for metal under impulsive loading. Results of an analysis using this model are used to predict interfacial appearance along the weld seam. Dimensional analyses are employed to derive empirical relations predicting the onset of waves in terms of gross process parameters and material properties. (Author)

Descriptors :   (*METALS, *PRESSURE WELDING), WELDS, THEORY, SHOCK WAVES, MECHANICS, INTERFACES

Subject Categories : Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE