Q.

Hard peening is

A. hammering the weld across the length while the joint is hot
B. hammering the weld along the length while the joint is hot
C. hammering the weld along the length while the joint is cold
D. hammering the weld across the length while the joint is cold
Answer» B. hammering the weld along the length while the joint is hot
Explanation: hammering is doe to relieve stresses and inducing compressive stresses to improve the fatigue strength of the joint.
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