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Practice Listening: Fill in the Blanks (Type In)
ID: #33697
Short
3D-printing
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A new process for 3D-printing things could pave the way for lighter, faster aircraft that fly further on the same amount of fuel. Today’s Aeroplanes are held together with thousands of metal rivets and fasteners. That’s because the lightweight but strong aluminium alloys used for their frames are considered unweldable. Try to weld them and you get a phenomenon called hot-cracking, in which the finished alloy weakens and as it cools. This and other adverse welding effects also stand in the way of 3D-printing high-strength aluminium alloy parts. When researchers have tried, the resulting laser-fused mass away at the welding area like a stale biscuit.
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