Question

Welds made with high heat input will show reduction in

• A. Yield strength
• B. Toughness
• C. Fatigue strength
• D. Mechanical strength

Hint:

High heat input in welding reduces cooling rate and increases grain size, leading to a drop in weld zone toughness.

Answer 1

The Correct Option is B

When welding is performed with high heat input, the cooling rate becomes slower. This promotes: - Formation of coarse grain structures in the heat-affected zone (HAZ), - Reduction in microstructural refinement, - Increased susceptibility to cracking. As a result, toughness of the weld decreases significantly, although other properties like yield or fatigue strength may not be as drastically affected.