Question

Which of the following methods is used for the cutting of directionally solidified rods or castings?

(a) Thermal cutting

(b) Electro-discharge machining

(c) Water jet cutting

(d) Weld cutting

I had been asked this question in an interview for job.

I would like to ask this question from Directional Solidification topic in chapter Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

Answer 1

Correct option is (b) Electro-discharge machining

Explanation: The directionally solidified castings are cut transversely and longitudinally by the application of electro-discharge machining. In this method, material is removed from the work-piece by discharging of current between the electrodes, results in an electric voltage. This method is also known as spark machining.