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

Shipbuilding

Robert Allen Designed Tug Launched in Italy

Rimorchiatori Riuniti bolsters Porto di Genova fleet with another Robert Allan Ltd. designed tug Rimorchiatori Riuniti currently operates five Robert Allan Ltd.

Video: Submarine John Warner Launched for Testing

Huntington Ingalls Industries (HII) launched the Virginia-class submarine John Warner (SSN 785) into the James River on September 10 at the company's Newport News Shipbuilding division,

URAG Orders Two ASD Tugs from Damen

URAG, a German port and offshore towage provider based in Bremerhaven, has placed an order for two Damen ASD 2411 tugs. The contract was signed at the SMM exhibition in Hamburg.

Navy

Video: Submarine John Warner Launched for Testing

Huntington Ingalls Industries (HII) launched the Virginia-class submarine John Warner (SSN 785) into the James River on September 10 at the company's Newport News Shipbuilding division,

Today in U.S. Naval History: September 17

Today in U.S. Naval History - September 17 1861 - Union landing party from USS Massachusetts takes possession of Ship Island, Mississippi. This was the headquarters for Adm.

Bulgarian Naval Academy Installs VSTEP Simulators

The Nikola Vaptsarov Naval Academy in Varna purchased a 360° Class A Full Mission Bridge simulator and an Incident Management Simulator for training of its Naval and Merchant marine students.

Education/Training

Bulgarian Naval Academy Installs VSTEP Simulators

The Nikola Vaptsarov Naval Academy in Varna purchased a 360° Class A Full Mission Bridge simulator and an Incident Management Simulator for training of its Naval and Merchant marine students.

BHP Billiton Communities and EWB Provide Support to 5 Students

BHP Billiton Sustainable Communities and Engineers Without Borders Support Students in Sustainable Development September 16, 2014 Five university students

TWC Funds Training of 195 Mariners at San Jacinto College

Texas Workforce Commission (TWC) informs that its Chairman, Andres Alcantar, recently visited the San Jacinto College maritime training center to present a $368,

Naval Architecture

Robert Allen Designed Tug Launched in Italy

Rimorchiatori Riuniti bolsters Porto di Genova fleet with another Robert Allan Ltd. designed tug Rimorchiatori Riuniti currently operates five Robert Allan Ltd.

First-of-type Walk-to-Work Crewboat Launched

Incat Crowther announced the launch and sea trials of Muslim Magomayev, a first-of-type 70m Catamaran Fast Crew Boat (FCB). Constructed by Incat Tasmania, Muslim

Austal Delivers Fourth JHSV to the US Navy

The U.S. Navy accepted delivery of USNS Fall River (JHSV 4) from Austal USA yesterday, a week shy of six months from the date they took delivery of JHSV 3. This

News

Prime Minister Solberg Visits DNV GL

Norway’s Prime Minister Erna Solberg visited DNV GL Høvik yesterday, September 16. Group President & CEO Henrik Madsen was host. “The Prime Minister was both

MARAD to Mark the Return of MV Cape Ray

Maritime (MARAD) Administrator Paul N. Jaenichen will host a ceremony on Friday, September 19, 2014 in Portsmouth, Va. to honor the civilian crew who helped to

Houston Shipping and Offshore Conference Program Announced

The fourth Houston Shipping and Offshore Conference has announced the final program for its Friday, October 10 conference at the Houstonian Hotel, Club & Spa, 111 N.

 
 
Maritime Standards Navigation Pipelines Pod Propulsion Port Authority Salvage Ship Electronics Ship Repair Shipbuilding / Vessel Construction Sonar
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: 0.2944 sec (3 req/sec)