Increase of the Reproducibility of Joints Welded with Magnetic Pulse Technology Using Graded Surface Topographies
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Date
2016-04-27
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Abstract
The reproducibility of individual welding methods depends to large extents on the material
properties. This is especially the case for impact welding as tests have shown that the surface
properties influence the joint formation. With the aim to influence the formation and position
of the lower curve of the welding process window, this paper focuses on how the surface
topography influences an asymmetrical impact. Additionally, relevant process parameters
(e.g. collision speed, collision angle, jet formation) will be included and disturbance
contours that are placed transversely to the collision vector will be examined. A high-speed
camera was used to measure the collision speed as well as the collision angle. The specific
surface topographies were created using belt grinding (cutting with geometrically undefined
edges) and laser ablation (non-cutting process, local vaporization of materials through
pulsed laser beams). The tests exemplarily show a strong correlation between the surface
geometries and the joint. The disturbance contours that were introduced transversely to the
collision vector shift the lower weld seam boundary, whereas a reduction of the discharge
energy leads to a relative strength of the joint of 1.0.
In sum, this paper offers fundamental insights into the mechanisms of the joint
formation when using magnetic pulse welding and shows the influence of the surface
topographies on the conflict between relevant procedural parameters and the possibility to
shift the lower procedural window.
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Keywords
surface topography, reproducibility, lower weld seam boundary