Investigation of Collision Welding by High-Speed Imaging
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Date
2021-10-14
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Abstract
Collision welding bases on the oblique collision of two joining partners at high relative
velocities. Until today, the mechanisms of collision welding are not yet fully understood
due to the variety of phenomena occurring during the collision. One of these phenomena is
the cloud of particles whose influence on bond formation has been neglected concerning
its stored thermal energy. For the investigation of this influence, a collision welding model
test rig was used which allowed the precise adjustment of the process parameters. The
process observation was implemented by an image intensifier camera to visualize the
ongoing collision and the occurring process phenomena. In this manuscript the developed
methodology and the results of high-speed process observation are presented. The findings
confirmed previous research regarding the shape formation of the cloud of particles and
the influence on bond formation. It was found that the temperature of the cloud of particles
depends strongly on the collision angle. Furthermore, an accumulation of the cloud of
particles during the collision process was recorded which might influence the steadiness of
the welding process.
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Keywords
collision welding, cloud of particles, high-speed Imaging