Millwright Level 1 Practice Exam

Which of the following represents a risk when fasteners are placed near welds in steel?

1. Increased stability of the fastener

2. Potential brittleness of the steel

3. Enhanced integrity of the structure

4. Increased strength of the weld

The correct answer is: Potential brittleness of the steel

Fastening components near welds in steel can introduce several risks due to the heat and stress involved in the welding process. One of the significant concerns is the potential brittleness of the steel, particularly in the heat-affected zone (HAZ) surrounding the weld. When steel is subjected to high temperatures during welding, its microstructure can change, leading to altered mechanical properties. This change can include the formation of brittle phases in the metal that can significantly compromise the overall toughness and ductility of the component. As a result, if fasteners are placed too close to the welds, they can become more susceptible to failure, as the surrounding area may not endure the same strength and flexibility as the base material did before welding. This inherent brittleness poses a risk for structural integrity, especially under dynamic loads or impact conditions. Understanding this risk is crucial in the design and implementation of welded structures, as it emphasizes the need for proper placement of fasteners and consideration of the effects of heat on surrounding materials.