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

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

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.

Related Questions

S1: Production of coins starts with the buying of unmixed metals and their testing by the Assay Department.
P: These ingots are reheated until the temperature is hot enough for hot rolling.
Q: During this stage, the ingots pass through a series of rollers until they form long, thin sheets which are the thickness of a coin.
R: From these thin strips, blank discs are punched.
S: Then the metals are alloyed in oil - fired or electric arc furnaces, and cast into ingots 40 cm wide, 15 cm thick and 6 m long.
S6: The blanks are heated to soften them, then rolled so that the rim is raised and are stamped with the design of the coin.

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