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Shock effects on the upper limit of the collision weld process window
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The maximum flyer impact velocity based on a dynamic solidification cracking mechanism is proposed to describe the upper limit of collision welding process win-dows.Thus,the upper limit of the weld window is governed by the evolution of dynamic stresses and temperatures at the weld interface.Current formulations for the upper limit of the collision weld window assume that both the flyer and target are made of the same material and approximate stress propagation velocities using the acoustic velocity or the shear wave velocity of the weld material.However,collision welding fundamentally depends on the impacts that generate shockwaves in weld members,which can dominate the stress propagation velocities in thin weld sections.Therefore,this study proposes an alternative weld window upper limit that approximates stress propagation using shock velocities cal-culated from modified 1-D Rankine-Hugoniot relations.The shock upper limit is validated against the experimental and simulation data in the collision welding literature,and offers a design tool to rapidly predict more accurate optimal col-lision weld process limits for similar and dissimilar weld couples compared to existing models without the cost or complexity of high-fidelity simulations.
Collision weldingSolid-state weldingShock impactWeld process modellingExplosive bondingLaser impulse welding(LIW)
Blake Barnett、Anupam Vivek、Glenn Daehn
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Department of Materials Science and Engineering,The Ohio State University,Columbus,OH 43210,USA
Army Research Directorate,Army Research Laboratory,DEVCOM,Aberdeen Proving Ground,Harford,MD 21005,USA
Department of Materials Science and Engineering,The Ohio State University,Columbus,OH,43210,USA
DEVCOM Army Research LaboratoryDepartment of Defense SMART scholarshipforservice program
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