Answer :
Final answer:
Weld fatigue is caused by dynamic, not static, loads over time. Static weld loads are constant and do not lead to fatigue, whereas dynamic loads can lead to weld failure due to crack growth. Option a is the answer.
Explanation:
Weld fatigue is related to the repetitive load cycles that a weld is subjected to over time, which can lead to the initiation and propagation of cracks, and eventually result in a failure of the welded structure. The correct answer to the question is A. Static weld loads, as they are not related to fatigue which is a consequence of dynamic or fluctuating stresses. Static loads are constant and do not cause fatigue in the same way that varying dynamic loads can. It's crucial for engineers and welders to consider the potential for fatigue in their designs especially when the welded structures will be subjected to dynamic stresses through their service life.
