A design engineer specifies a weld joint for a primary structural connection that will be subjected to significant fatigue loading. To comply with CSA W59 requirements, what factor is particularly important to consider and control during the welding process to ensure the fatigue performance of the joint?

Question: A design engineer specifies a weld joint for a primary structural connection that will be subjected to significant fatigue loading. To comply with CSA W59 requirements, what factor is particularly important to consider and control during the welding process to ensure the fatigue performance of the joint?

Answer options:

• The colour of the weld bead
• The use of high travel speeds to minimize heat input ✅ Minimizing stress concentrations and ensuring good weld toe transitions
• Performing post-weld grinding on all weld faces

Correct answer: Minimizing stress concentrations and ensuring good weld toe transitions

Explanation: For connections subjected to fatigue loading, CSA W59 emphasizes the reduction of stress concentrations, particularly at weld toes and changes in section. Achieving smooth weld toe transitions and ensuring good weld profiles are critical to improving fatigue life, more so than the color of the bead or just increasing travel speed.