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

Shipbuilding

Cecon Secures Finances to Complete Newbuild

Cecon ASA has petitioned for a debt restructuring agreement (in Norwegian: gjeldsforhandling). Certain funds managed by York Capital Management Global Advisors,

NMEA Updates Installation Standards

2014 edition of NMEA 0400, Version 4.00 features extensive updates and new information   The National Marine Electronics Association (NMEA) has published Edition 2014, Version 4.

HII Board of Directors Elects Two VPs

Huntington Ingalls Industries’ (HII) board of directors has elected Kellye Walker to serve as corporate vice president and general counsel and Charles R. “Chuck” Monroe Jr.

Navy

NRL Researchers Demo Ship-to-Shore Data Link

Scientists at the U.S. Naval Research Laboratory (NRL) along with Mercury Continuity (MC) have demonstrated the Tactical Reachback Extended Communications (TREC) system in the port of Miami.

NASSCO Opens Bremerton Repair Facility

General Dynamics NASSCO celebrated the grand opening of its new location in Bremerton, Wash., yesterday. The facility will support the company’s recently-awarded contract to repair and maintain U.

NASSCO Opens New Facility for Naval Repair

General Dynamics NASSCO opened a new location yesterday in Bremerton, Wash. to support the company’s recently-awarded contract to repair and maintain U.S. Navy

Education/Training

Transas Installs ECDIS Simulators at Romanian University

Romanian university Constanța Maritime University will provide ECDIS training in accordance with the STCW 2010 requirements    Transas Marine has installed the

BCG Delivers Upgrades to Long-time Customers

Buffalo Computer Graphics (BCG) Inc. has recently delivered two upgrades to long-time customers Columbia Pacific Maritime in Portland Ore., and The River School in Memphis, Tenn.

VSTEP Achieves ISO 9001:2008 Certification

VSTEP, global supplier of simulator solutions for commercial, government and military customers in the maritime and public safety and security sectors, has been

Naval Architecture

Waterjet-propelled Crewboat Delivered to Petrobras

BS Camburi, a 36-meter Monohull Crewboat built in Brazil by Arpoador Engenharia to the Petrobras type P2 specification has been launched and delivered.   Designed by Incat Crowther,

Damen Responds to Evolving Fishing Practices

Maaskant Shipyards Stellendam meets fishing sector’s growing needs by performing electric pulse fishing conversions   As European fishing policies evolve, so fishing techniques advance.

Damen Delivers Survey Vessel to Fugro

Fugro Frontier is the third vessel in a series received by Fugro during 2014   Three months after its last delivery, Fugro has received the third of a series

News

WSC CEO Koch to Retire in 2015

Chris Koch, current president and CEO of the World Shipping Council (WSC), will retire from his position on July 31, 2015, and WSC Senior Vice-President and General Counsel,

NMEA Updates Installation Standards

2014 edition of NMEA 0400, Version 4.00 features extensive updates and new information   The National Marine Electronics Association (NMEA) has published Edition 2014, Version 4.

Port of Galveston to Repair Public Pier

Galveston Wharves’ board of trustees today unanimously approved a project to repair pilings and pier deck in the Pier 19 area of the port. The board awarded the contract,

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Maritime Standards Navigation Offshore Oil Pipelines Port Authority Ship Repair Ship Simulators
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: 0.2116 sec (5 req/sec)