Question

Inconel welds are cleaned after fabrication by submerging in a _________ cold nitric acid solution.

(a) 20%

(b) 50%

(c) 99%

(d) 12%

I had been asked this question during an interview.

Question is taken from Applications and Advantages of Nickel in section Nickel Alloys of Aerospace Materials & Processes

Answer 1

The correct answer is (b) 50%

To explain: Inconel welds are corrosion resistant. They are even more corrosion resistant when compared to the original material. Inconel welds are cleaned after fabrication by submerging in a 50% cold nitric acid solution.