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Monitoring of porosity defects in casting by ultrasonic inspection is very difficult.

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in Casting-Forming-Welding I by (687k points)
Monitoring of porosity defects in casting by ultrasonic inspection is very difficult.

(a) True

(b) False

The question was posed to me by my school principal while I was bunking the class.

My question is taken from Inspection Procedures in chapter Inspection Testing in Foundries of Casting-Forming-Welding I

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The correct option is (a) True

Easiest explanation: Individual pores do not produce any distinguishable indications under testing conditions. The ultrasonic indication of centre line porosity is typically presented or revealed in the form of noise. This makes it very difficult to distinguish between porosity and large grained structure that gives similar ultrasonic indications.

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