*Case 4.B [#v4190b7d] *Case 4.C [#v4190b7d] **The causes of fatigue [#f588ba61] > The structure behaved in a manner not expected such as due to vibration. **Approaches to repairing and retrofitting [#ye51f713] > re-weld. Surface treatments such as TIG dressing and Peening. > **LINK [#fc2e26bd]