Keyhole behaviour with and without magnetic field (VIDEO)
Caption
A laser typical of a 3D printer metal alloy printer oscillates heavily forming a “J” shaped keyhole which is unstable and collapses frequently leaving behind pores (top). When an appropriate magnetic field is applied (bottom), the keyhole retains a relatively stable “I” shape, leaving 80% fewer and smaller pores.
Credit
University College London
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License
CC BY-NC-ND