Elimination of Overwelding - NSRP Project Workshop

Marinelink.com
Monday, September 16, 2013

Technology Transfer Workshop: September 24, 2013, 9:00-11:30am Naval Surface Warfare Center

 

Overwelding is one of the most widespread problems in shipbuilding, causing significant distortion and associated rework costs in lightweight structural applications. In order to combat this problem, modeling and validation testing was performed by the project to determine possible changes to weld sizing design, as well as identify changes to standards which would alleviate the problems which lead to overwelding. This workshop will present the project findings and recommendations for changes to specifications.


Results of the Overwelding Project: Testing of small fillet welds demonstrating higher shear capacities as a result of greater percentage of dilution with base metals and higher cooling rates increasing mechanical strength of the joints.

 

With these results, and knowing the original basis for setting a minimum fillet weld size in an Ingalls ship specification, NAVSEA 05P4 was able to remove the minimum fillet size requirement and subsequently Ingalls was able to reduce design fillet sizes, thereby reducing non-value added weld distortion abatement costs. Testing performed provided the data needed to make changes to Navy fabrication specifications allowing some degree of under tolerance allowance for fillet welding that was not allowed in current specifications. This change addresses issues on the waterfront that lead welders to over weld and in turn apply excessive heat aggravating weld distortion and associated non-value added labor costs to correct. Waterfront welders typically over size required fillets to avoid QA write-ups and subsequent negative findings.


Project Participants: This project was funded by the NSRP and led by Ingalls Shipbuilding with support from: the University of New Orleans, the University of Maine, Concurrent Technologies, Applied Thermal Sciences, and NSWC/NAVSEA.


RSVP by Email by September 20, 2013 There is no fee to attend this event, however attendance is limited to US Citizens. In your email, please include: Full Name (as on your drivers’ license) Phone Number E-Mail Employer Laptop model and serial number in order to ensure a smooth check-in with security. RSVP’s should be sent to David Kihl (david.kihl@navy.mil).

Maritime Reporter June 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Shipbuilding

Carnival Vista Floated Out!

The Carnival Vista has completed its dry dock phase and was recently floated out to a new location at Italy's Fincantieri shipyard, Carnival Cruise Line has announced.

Tony Abbott Guarantees Submarine Jobs

Prime Minister Tony Abbott has assured South Australians there will be more submarine jobs here even if he won’t commit to having a new fleet of vessels built there,

Russian Submarines in Alaska?

Russia is expected to finish the construction of a submarine base on the Kamchatka Peninsula by the end of October.   "Upgrades to the Russian Navy’s ballistic

Navy

Russian Submarines in Alaska?

Russia is expected to finish the construction of a submarine base on the Kamchatka Peninsula by the end of October.   "Upgrades to the Russian Navy’s ballistic

Buoys in Disputed Waters Roil South China Sea Dispute

Buoys stretched "as far as eye could see" - Philippine sailor. The Philippine navy recently found a large steel marker bearing Chinese inscriptions and hundreds

MTU Powers RSN Navy's Littoral Mission Vessel

MTU to power eight Republic of Singapore Navy’s new patrol vessels. Employees and guests, including senior representatives from the Republic of Singapore Navy (RSN) and Ministry of Defence,

Naval Architecture

GEORG FORSTER Calls Southampton for the First Time

The CMA CGM Group announced that the CMA CGM GEORG FORSTER called England for the first time on July 6th.    With its 1,305 ft. (398m) length and 177 ft. (54m) width,

ISS Inks Service Pact with Technip

Inchcape Shipping Services (ISS) and Techniphave signed a contract to provide marine agency services and logistics for the Rashid C project in the Middle East. Currently

AVEVA, DNV GL's Sesam Integration Cuts Cost

Integration of Aveva and DNV GL's Sesam Reduces Costs in Maritime and Offshore Engineering. Engineers designing ship hulls and offshore floaters can now save

News

Carnival Vista Floated Out!

The Carnival Vista has completed its dry dock phase and was recently floated out to a new location at Italy's Fincantieri shipyard, Carnival Cruise Line has announced.

Tony Abbott Guarantees Submarine Jobs

Prime Minister Tony Abbott has assured South Australians there will be more submarine jobs here even if he won’t commit to having a new fleet of vessels built there,

GAIL to Offer Sops for Foreign Shipbuilders

GAIL India will offer foreign shipbuilders five years to make liquefied natural gas (LNG) carriers in India, double the time allowed to deliver ships from their home shipyards,

 
 
Maritime Careers / Shipboard Positions Maritime Security Maritime Standards Navigation Offshore Oil Pod Propulsion Ship Repair Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1994 sec (5 req/sec)