The objective of this study was to implement collision welding of tungsten alloy 17D (6.5% Ni,3.3% Fe) and copper at a laboratory scale and subsequently investigate the relationshipbetween interfacial structure and mechanical properties. Vaporizing Foil Actuator (VFA) hasrecently been demonstrated as a versatile tool for metalworking applications, such as impactwelding of dissimilar materials. Its implementation for welding is termed as VFA welding orVFAW. With 8 kJ input energy into an aluminum foil actuator, a 0.5 mm thick Cu110 alloysheet was launched toward a tungsten alloy target resulting in a collision at a velocity of 580m/s. The two sheets were found to be welded in the region where the collision velocity andangle were optimal. This range, termed as the welding window was found to be narrow forthis combination of target and flyer materials. Scanning electron microscopy of sectionedsamples showed regions of wavy interface with significant plastic deformation on both sides.Microhardness tests revealed significant increase in hardness near the interface.Instrumented peel tests showed that the welds were quite strong with peel strength of 60N/mm.
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