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Collaborative Research: GOALI: Fundamental Research on Impact Welding of Aluminum and Steel

 

Principal Investigators: Glenn Daehn, Anupam Vivek, Curtis Prothe (Nobel Clad), Brad Kinsey (UNH)

 

This 3-year (9/2015-8/2018) award supports fundamental research on impact welding - to join material combinations that are otherwise difficult to join. Research will focus on aluminum-steel welds because there are diverse and important commercial needs in joining these metals. 

The objectives of this research are: 

  1. to understand how the thickness of the flyer plate (and therefore its total kinetic energy) affects the structure of the interface that is formed,
  2. to understand the real-time evolution of strain, temperature and morphology of the interface during the impact welding process
  3. to relate the deformation history to the final structure and properties of the weld.  Unique tools are used to study aluminum-steel impacts from flyer thicknesses of 25 µm to 25 mm

Laser impact welding and explosive welding are used for the thinnest and thickest flyers, respectively, while vaporizing foil actuator welding will be used to accelerate flyers of several intermediate thicknesses.  Photonic Doppler velocimetry will enable detailed measurements of collision speed and angle.  Finite element models based on Smoothed Particle Hydrodynamics and Arbitrary Lagrangian-Eulerian methods will be developed for these problems. Their validity will be tested by metallographic examination of welded structures and comparison of these to simulation. These models will be used to understand the complex dynamic development of material strains, temperatures and structures and on a wide range of length scales. 

 

Major activities:

Year 1
Year 2

Year 3 (upcoming)

 

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