Which failure type is linked to T1 steel butt welds according to the notes?

• A. Rivet hole filled with wellment started a crack
• B. Impact damage
• C. Overloaded gusset plates
• D. T1 steel butt weld failure

Answer: (D)

The key idea is that weld-related failure is the mode associated with T1 steel butt welds. The notes specifically call out a failure type tied to T1 butt welds, meaning when you see cracking or failure occurring at the butt welds of T1 steel members, it’s categorized as T1 steel butt weld failure. This reflects how this material and joint type can fail at the weld itself or the heat-affected zone due to welding quality, residual stresses, or material properties. Other listed possibilities describe different failure mechanisms (for example, crack initiation from a rivet hole filled with material, general impact damage, or failures from overloading gusset plates) and do not match the weld-specific failure noted for T1 butt joints.