Question

During solidification of casting material, the successive droplets of the material take a longer time to solidify than the first droplet.

(a) True

(b) False

The question was asked in an interview for job.

Enquiry is from Solidification with Constant Surface Temperature in section Cooling and Solidification of Casting-Forming-Welding I

Answer 1

The correct answer is (a) True

To elaborate: During solidification of casting, the successive droplet’s interface has lower temperature gradient when compared to the temperature gradient experienced by the first droplet of the material. Thus, heat transfer occurs at low rates and successive droplets take longer time to solidify that the first droplet of the casting material.