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Which of the following temperature ranges (in Kelvin) can start the re-melting of droplets of casting material?

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in Casting-Forming-Welding I by (687k points)
Which of the following temperature ranges (in Kelvin) can start the re-melting of droplets of casting material?

(a) 400 – 450

(b) 450 – 500

(c) 500 – 600

(d) 600 – 700

I got this question in exam.

Asked question is from Solidification with Constant Surface Temperature in chapter Cooling and Solidification of Casting-Forming-Welding I

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Correct answer is (d) 600 – 700

The explanation: As the first droplet solidified when the successive droplets make an impact to it and the temperature of the pre-solidified droplet is very close to its melting temperature. The droplet temperature is approximately greater or equals to 623 K, at which the pre-solidified droplet re-melts and shows re-melting behaviour at different time instants.

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