Explosive Impulse Welding. Volume I.
Abstract
Explosive welds were conducted with various combinations of aluminum and steel varying plate thicknesses, different configurations, several explosives at various concentrations and atmospheres of various types. Framing camera, flash x-ray collapsible velocity probes and manganin wire pressure gages were used to record position-time data, velocities and pressures. Welded specimens were tested destructively and nondestructively to measure weld tensile and shear strength, metallographic data, and ultrasonic characteristics. Test results were correlated with welding variables. Data were analyzed, for correlation with parameters. Models were developed to predict flyer plate response and weld interface response during welding. Weld quality (tensile strength) for a given material was found to be primarily a function of collision point velocity, collision angle and flyer plate thickness. These parameters can be optimized to consistently achieve weld tensile strength in excess of parent metal strength by considering four criteria; (1) The critical collision angle for jet formation, (2) The critical impact velocity (or pressure) for jet formation in the subsonic regime, (3) The critical collision point transition velocity, and (4) The kinetic energy of the flyer plate versus the heat dissipation characteristics of the collision region. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1977
- Accession Number
- ADA047955
Entities
People
- Douglas H. Merkle
- George E. Cannon Jr
Organizations
- United States Air Force Academy