Collision Welding of Tungsten Alloy 17D and Copper Using Vaporizing Foil Actuator Welding
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Date
2014
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Abstract
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 relationship
between interfacial structure and mechanical properties. Vaporizing Foil Actuator (VFA) has
recently been demonstrated as a versatile tool for metalworking applications, such as impact
welding of dissimilar materials. Its implementation for welding is termed as VFA welding or
VFAW. With 8 kJ input energy into an aluminum foil actuator, a 0.5 mm thick Cu110 alloy
sheet was launched toward a tungsten alloy target resulting in a collision at a velocity of 580
m/s. The two sheets were found to be welded in the region where the collision velocity and
angle were optimal. This range, termed as the welding window was found to be narrow for
this combination of target and flyer materials. Scanning electron microscopy of sectioned
samples 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 60
N/mm.
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Keywords
collision welding, wavy interface, photonic Doppler Velocimeter (PDV), tungsten alloy, copper, VFAW