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  1. Applied Ultrasonics
17 September 2013

Resolving Unexpected Hull Fatigue Cracking Issues

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.

Applied Ultrasonics’ Engineering Services group 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 Applied Ultrasonics 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 Esonix UIT. This approach provided the fatigue-prone material and geometry a massive increase in fatigue life and fatigue strength.

Applied Ultrasonics 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!

Noble Drilling retained Applied Ultrasonics to employ ultrasonic impact technology to treat the structure of one of their ABS classified semi-submersible offshore drilling rigs deployed...
It is commonly observed that complex fabricated structures subject to fatigue loading fail at the welded joints. Some problems can be corrected by proper detail...
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