a means of inducing favourable residual stresses in pressure vessels

[Solved] Auto frettage is a

Q.	Auto frettage is a
A.	extra cover provided on seamless pipes to increase their hoop stress
B.	a means of inducing favourable residual stresses in pressure vessels
C.	Increasing the diameter of threaded portion
D.	a heat treatment for pressure vessels subjected to low temperatures
E.	surface coating process
Answer» B. a means of inducing favourable residual stresses in pressure vessels

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