A laser beam with a power intensity of is used to machine 3 mm thick nickel shee

Question

A laser beam with a power intensity of is used to machine 3 mm thick nickel sheet with a 100 mm waist diameter with a 5 ms pulse in a 20 ms cycle. Melting temperature = 1720 K and boiling temperature of Temperature of Nickel = 3150 K. density, thermal conductivity, k = 90 W/cm degree C. Specific heat in liquid and solid state, = 0.444 J/. Latent heat of evaporation =. Latent heat of melting is 1% of the latent heat of evaporation. Assume 10% of the laser power is used. Estimate the time required for the material at center of the beam to reach it melting temperature. Assuming the metal removed as a spherical cap of the diameter equal to the beam waist diameter, estimate the depth h of the cap in one pulse. Estimate the metal removal rate in Estimate the time required to drill though the hole

Explanation / Answer

The answer of following question is as follows.

The time required for the material at the centre of the beam is 9 min .

The depth is 79 m

The time required to drill is 78 sec

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