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 Today


The Maritime Industry's original and most viewed E-News Service

Maritime Reporter April 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Shipbuilding

Massive Layoff Ahead for Hyundai Heavy

Another massive reduction in the Korean shipbuilding workforce may come as most shipyards are still struggling with falling orders and mounting losses, reports Yonhap quoting industry sources.

Daewoo Shipyard Posts Q1 Operating Loss

South Korean shipbuilder Daewoo Shipbuilding & Marine Engineering Co. posted a first-quarter loss after incurring more costs to finish some offshore projects.   First-quarter

NASSCO Delivers First ECO Class Tanker for SEA-Vista

On Thursday, April 28, 2016, General Dynamics NASSCO delivered the first ship in a series of three ECO Class tankers currently under construction for SEA-Vista LLC.

Navy

Arabian Shipping at Risk of Al Qaeda Attack

Al Qaeda's Yemen branch remains a powerful force and poses a growing risk to merchant ships in vital waterways nearby despite efforts by Yemeni government forces

$ 280 mi Deal for Pacific Patrol Boats Replacement

The Turnbull Government today signed a contract with Austal Ships Pty Ltd to build and sustain up to 21 steel-hulled vessels to replace the existing fleet of Pacific

This Day In Naval History: May 4

1917 - Destroyer Division 8, commanded by Cmdr. Joseph K. Taussig, arrive at Queenstown, Ireland, to protect convoy escorts against German U-Boats. 1942 - Battle

Education/Training

Aydin Marine Debuts Multi-Touch K-17T

Aydin Marine – the manufacturer of industry-leading, type-approved displays, computers and peripherals, announced today the release of a 17-inch multi-touch, sunlight-readable

Singapore Scheme to Tackle Lack of Marine Engineers

Singapore has launched an initiative to attract more locals to take up a career as a marine engineer. The joint venture between unions, government and industry aims to address an acute shortage.

Port of London Bridge Simulator Upgraded

The Port of London Authority (PLA) has invested £250,000 to upgrade its ship’s bridge simulator, adding a full tug bridge simulator in a move that is set to enable

News

Gard Alert: Is Fuel in your Emergency Equipment Fit for Purpose?

Imagine the following scenario: It is in the middle of winter in the north Atlantic, freezing cold with rough seas, when an emergency onboard a tanker requires the crew to abandon the ship.

China's CNOOC Expands Fujian LNG Terminal

China's biggest liquefied natural gas (LNG) importer CNOOC has started building two storage tanks at a receiving terminal in Fujian province for the super-chilled fuel,

Abu Dhabi Puts Fujairah LNG Terminal On Hold

Citing sources familiar with the matter, Bloomberg reports that Abu Dhabi is delaying the construction of the UAE’s first land-based LNG import terminal after

 
 
Maritime Careers / Shipboard Positions Naval Architecture Navigation Offshore Oil Port Authority Salvage Ship Repair Ship Simulators 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: 0.0973 sec (10 req/sec)