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 July 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Shipbuilding

US’ Largest Floating Drydock Heads to Portland

The country’s largest floating drydock, the Vigorous, is headed for Portland this weekend. The drydock, a piece of equipment used to lift vessels as large as cruise ships out of the water,

Country’s Largest Floating Drydock Coming to Portland

The country’s largest floating drydock, the Vigorous, is headed for Portland this weekend. The drydock, a piece of equipment used to lift vessels as large as cruise ships out of the water,

Ecuador Coastguard Orders Damen Patrol Boats

Damen announced it has recently signed a contract with AstillerosNavalesEcuatorianos (Astinave) to construct two Damen Stan Patrols (Spa) 5009 for the Ecuadorian Coastguard.

Navy

MN 100: Brunswick Commercial and Government Products

420 Megan Z. Ave Edgewater, FL 32132 Telephone: 386 423 2934 E-mail: kelsey.nemeth@whaler.com Website: www.brunswickcgp.com CEO/President: Huw Bower Number

MN 100: BAE Systems Ship Repair

750 W. Berkley Avenue Norfolk, VA 23523 Tel: (757) 494-4674  Email: john.measell@baesystems.com Website: www.baesystems.com/shiprepair President: William Clifford The Company: BAE Systems,

Signet Tows Aircraft Carrier on Final Voyage

The final voyage of aircraft carrier USS Saratoga begins today. From the Eastern Hemisphere to the Western Hemisphere, the USS Saratoga has made her mark around the globe,

Education/Training

Drum Cussac Trains O&G Supply Entrepreneurs

Drum Cussac said it is helping Tanzania's budding entrepreneurs cater to the requirements of the international oil and gas companies operating in the country, as

VSTEP Delivers FMB Simulator to Danaos

Danaos Corporation purchased a NAUTIS DNV Class A FMB Simulator and Instructor Station for training of its fleet members.  The simulator will be delivered and installed

Maersk Drilling Rig Team Train Local Talent

Maersk Drilling says that its 'Mærsk Deliverer' rig team has initiated seven local acceleration programmes in Angola. The goal is to train and develop local talent

Naval Architecture

Ecuador Coastguard Orders Damen Patrol Boats

Damen announced it has recently signed a contract with AstillerosNavalesEcuatorianos (Astinave) to construct two Damen Stan Patrols (Spa) 5009 for the Ecuadorian Coastguard.

LNG America Selects Topside Designer for LNG Bunker Barge

LNG America has selected Taylor-Wharton to commence the front-end engineering and design work for the cryogenic topside of the company’s 3,000 cubic meter Gemini

MN 100: Brunswick Commercial and Government Products

420 Megan Z. Ave Edgewater, FL 32132 Telephone: 386 423 2934 E-mail: kelsey.nemeth@whaler.com Website: www.brunswickcgp.com CEO/President: Huw Bower Number

News

Banking on US Shale Gas Boom, Asia Petrochemical Firms Switch to LPG

Asia petrochemicals firms are building tanks and retooling plants to store and process liquefied petroleum gas imported from the United States, counting on a flood

Danos Fabrication Facility Creates 150 Jobs

Danos, a family owned oil and gas service company, announced plans to expand its fabrication capabilities, by opening a 120,000 square-foot fabrication facility in Amelia, La.

US’ Largest Floating Drydock Heads to Portland

The country’s largest floating drydock, the Vigorous, is headed for Portland this weekend. The drydock, a piece of equipment used to lift vessels as large as cruise ships out of the water,

 
 
Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Port Authority Ship Repair Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | 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: 0.3581 sec (3 req/sec)