A laser beam with a power intensity of is used to machine 3

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

Solution

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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