Correct option is B
Peening is a mechanical process in which a weld is subjected to light and rapid hammering immediately after welding. This operation helps to relieve residual stresses induced during the welding process and improves the fatigue strength of the welded structure. The process is often carried out using a pneumatic hammer or a manual hammer with a peening tool.
Information Booster:
· Peening improves resistance to crack propagation.
· It is commonly used in high-strength steel welds and critical joints.
· Peening induces compressive stresses that counteract tensile stresses from welding.
· It reduces distortion and warping caused by residual stresses.
· Peening can be manual or mechanized.
· Excessive peening should be avoided as it can damage the weld.
