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Which of the following processes is preferred for preparing aluminium ingots for liquid penetrant testing method?

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in Casting-Forming-Welding I by (687k points)
Which of the following processes is preferred for preparing aluminium ingots for liquid penetrant testing method?

(a) Machining

(b) Caustic etching

(c) Grinding

(d) Acid pickling

The question was posed to me in examination.

This interesting question is from Inspection and Testing in division Inspection Testing in Foundries of Casting-Forming-Welding I

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Right answer is (d) Acid pickling

The best I can explain: When liquid penetrant test is used for aluminium ingots, before the test, the surfaces of the aluminum ingots are prepared or treated with the acid pickle. This process is basically known as acid pickling and it is recommended in preference to all other processes like caustic etching, machining etc.

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