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

Shipbuilding

Mermaid Maritime Bags Subsea Contracts, Delays Newbuilding

Thailand’s Mermaid Maritime said it has been awarded a number of subsea contracts in the Middle East with a total worth of $11million.   It has also reached

CBP, AMO Unveils New Interceptor Vessel

U.S. Customs and Border Protection (CBP) Air and Marine Operations (AMO) and SAFE Boat International celebrated the unveiling of AMO’s newest coastal interceptor vessel (CIV) Thursday.

Seaspan Acquires Eighth 14000 TEU Vessel

Seaspan Corporation (NYSE:SSW) announced today that it accepted delivery of a 14000 TEU containership, the YM Width. The new containership, which was constructed at CSBC Corporation,

Navy

US Navy Updated Zika Virus Infection Guidance

Navy Medicine released updated Zika Virus Infection guidance in NAVADMIN 121/16, May 26, communicating current information, travel precautions, and risk reduction

1,076 Graduate from U.S. Naval Academy

The U.S. Naval Academy graduated 1,076 men and women at the annual graduation and commissioning ceremony May 27 at Navy-Marine Corps Memorial Stadium. U.S. Naval Academy Superintendent Vice Adm.

Phoenix Express 2016 Concludes

Maritime forces from North Africa, Europe, and the United States concluded exercise Phoenix Express 2016 with closing ceremonies in Souda Bay, Greece May 27. Phoenix Express,

News

APM Terminals Bahrain Push for Safety, IT systems

Hidd, Khalifa Bin Salman Port, Bahrain - APM Terminals Bahrain, operators of Khalifa bin Salman Port (KBSP), has recently made significant advances in Safety performance

Seized Hanjin Shipping Vessel Resumes Operation in South Africa

Hanjin Paradip resume  its sailing from South Africa as talks continue with owner over unpaid charter fees. The ship had been detained in Richards Bay, South Africa

Deployment: The Transpacific Trade Steps Up To The Plate

In 2015, it was the Asia-Europe route which was the focus of changing deployment trends, says Clarksons Research.   This year, it is the Transpacific trade which

 
 
Maritime Careers / Shipboard Positions Maritime Security Maritime Standards Pipelines Pod Propulsion Port Authority Salvage Ship Electronics Ship Simulators Shipbuilding / Vessel Construction
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: 0.0908 sec (11 req/sec)