What is the primary purpose of a fillet weld in structural steel connections?

What is the primary purpose of a fillet weld in structural steel connections?

• A. Aesthetic appearance
• B. Reduce stress concentration
• C. Increase weight
• D. Change color

Answer: (B)

Fillet welds are used to join pieces by filling the corner where the members meet, and their main purpose is to smooth the transfer of stresses between the connected parts. The rounded fillet provides a gradual transition, which lowers stress concentrations at the weld toes and along the weld throat. This reduces the peak stresses the joint experiences, improving strength and fatigue performance in structural steel. Aesthetic appearance, increasing weight, or changing color are not the primary goals of a fillet weld.

Fillet welds are used to join pieces by filling the corner where the members meet, and their main purpose is to smooth the transfer of stresses between the connected parts. The rounded fillet provides a gradual transition, which lowers stress concentrations at the weld toes and along the weld throat. This reduces the peak stresses the joint experiences, improving strength and fatigue performance in structural steel. Aesthetic appearance, increasing weight, or changing color are not the primary goals of a fillet weld.