1
.
A powder particle size distribution denoted by D90=100 means what?
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All the powder particles are less than 90 microns
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90% of powder particles are less than 100 microns
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90% of powder particles are equal to 100 microns
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100% of powder particles are less than 90 microns
2
.
Atomization is a process where
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plasma torch is used to melt a cylindrical bar of the desired alloy
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Existing irregularly shaped or porous particles are melted into spherical powder particles
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A liquid metal stream is pushed through an orifice and mixed with flowing fluid that forces the liquid to scatter, which then solidifies into generally spherical powders
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A wire feedstock is melted by plasma torches
3
.
Which AM processes use metal powders?
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PBF, BJP, DED, and cold spray
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SL Only
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PBF only
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DED only