Marine Fatigue Crack Assessed, Addressed and Put to Rest: Unexpected Hull Fatigue Cracking Issue Resolved


New designs always bring unforeseen problems. For one such client, a cutting-edge, mid-sized defense cutter was no exception. During sea trials, the cutter began to develop hull cracks in the marine-grade aluminum structure.


Progress Rail’s Ultrasonic Technology (UIT) Division sent a Subject Matter Expert (SME) to evaluate the cutter’s cracking issues and consult with the shipyard. With an extremely tight schedule ahead, a solution was developed and proposed by Progress Rail's Ultrasonic Technology (UIT) Division on the spot and quickly approved by the shipyard. Applied Ultrasonics’ solution was to enhance the weld joint design, coupled with non-thermal stress relief using the application of UIT. This approach provided the fatigue-prone material and geometry a massive increase in fatigue life and fatigue strength.


Progress Rail's Ultrasonics Division deployed a Welding Engineer and Certified Weld Inspector to the shipyard to ensure that the solution was correctly applied. The end result – no more hull cracks!




put uit to work