Underwater welding

Underwater welding

Underwater welding refers to a number of distinct welding processes that are performed underwater.cite book |author=Keats, DJ |year=2005 |title=Underwater Wet Welding - A Welder's Mate |publisher=Speciality Welds Ltd |url=http://www.specialwelds.com |isbn=1-899293-99-X. |Pages=300 ] cite book |author=Cary, HB and Helzer, SC |year=2005 |title=Modern Welding Technology |location=Upper Saddle River, New Jersey |publisher=Pearson Education |isbn=0-13-113029-3 |pages=677-681 ] The applications of underwater welding are diverse—it is often used to repair ships, offshore oil platforms, and pipelines. Steel is the most common material welded.

The two main categories of underwater welding techniques are wet underwater welding and dry underwater welding, both are classified as hyperbaric welding.

For deepwater welds and other applications where high strength is necessary, dry underwater welding is most commonly used. Research into using dry underwater welding at depths of up to 1000 m are ongoing. [cite journal |author=Bennett PB, Schafstall H |title=Scope and design of the GUSI international research program |journal=Undersea Biomed Res |volume=19 |issue=4 |pages=231–41 |year=1992 |month=July |pmid=1353925 |doi= |url=http://archive.rubicon-foundation.org/2596 |accessdate=2008-07-05] In general, assuring the integrity of underwater welds can be difficult (but is possible using various nondestructive testing applications), especially for wet underwater welds, because defects are difficult to detect if the defects are beneath the surface of the weld.

dustin did this

Wet underwater welding

In wet hi


The risks of underwater welding include the risk of electric shock to the welder. To prevent this, the welding equipment must be adaptable to a marine environment, properly insulated and the welding current must be controlled. Commercial divers must also consider the safety issues that normal divers face; most notably, the risk of decompression sickness following saturation diving due to the increased pressure of inhaled breathing gases.cite book |title=US Navy Diving Manual, 6th revision |year=2006 |publisher=US Naval Sea Systems Command |location=United States |url=http://www.supsalv.org/00c3_publications.asp?destPage=00c3&pageID=3.9 |accessdate=2008-07-05 ] Another risk, generally limited to wet underwater welding, is the buildup of hydrogen and oxygen pockets, because these are potentially explosive. Many divers have reported a metallic taste that is related to the breakdown of dental amalgam. [cite journal |author=Ortendahl TW, Dahlén G, Röckert HO |title=Evaluation of oral problems in divers performing electrical welding and cutting under water |journal=Undersea Biomed Res |volume=12 |issue=1 |pages=69–76 |year=1985 |month=March |pmid=4035819 |doi= |url=http://archive.rubicon-foundation.org/3030 |accessdate=2008-07-05] [cite journal |author=Ortendahl TW, Högstedt P |title=Magnetic field effects on dental amalgam in divers welding and cutting electrically underwater |journal=Undersea Biomed Res |volume=15 |issue=6 |pages=429–41 |year=1988 |month=November |pmid=3227576 |doi= |url=http://archive.rubicon-foundation.org/2486 |accessdate=2008-07-05] [cite journal |author=Ortendahl TW, Högstedt P, Odelius H, Norén JG |title=Effects of magnetic fields from underwater electrical cutting on in vitro corrosion of dental amalgam |journal=Undersea Biomed Res |volume=15 |issue=6 |pages=443–55 |year=1988 |month=November |pmid=3227577 |doi= |url=http://archive.rubicon-foundation.org/2485 |accessdate=2008-07-05] There may also be long term cognitive and possibly musculoskeletal effects associated with underwater welding.cite journal |title=Further investigation of possible musculoskeletal and cognitive deficit due to welding in divers identified in the ELTHI diving study |year=2005 |author=Macdiarmid JI, Ross JAS, Semple S, Osman LM, Watt SJ, Crawford JR |journal=Health and Safety Executive |volume=Technical Report rr390 |url=http://www.hse.gov.uk/research/rrpdf/rr390.pdf |accessdate=2008-07-05]


External links

* [http://www.hse.gov.uk/diving/ Health and Safety Executive] - Performs research on long term health effects from underwater welding.
* [http://www.twi.co.uk/j32k/protected/band_3/ksdja001.html Process overview at The Welding Institute]

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Welding — is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done by melting the workpieces and adding a filler material to form a pool of molten material (the weld puddle ) that cools to… …   Wikipedia

  • Oxy-fuel welding and cutting — Oxyacetylene redirects here. For the song, see Cubanate. Side of metal, cut by oxygen propane cutting torch …   Wikipedia

  • Hyperbaric welding — is the process of welding at elevated pressures, normally underwater. Hyperbaric welding can either take place in the water itself or inside a specially constructed pressure chamber and hence a dry environment. It is predominantly referred to as… …   Wikipedia

  • Gas metal arc welding — RMD redirects here. RMD may also refer to IRA Required Minimum Distributions. Gas metal arc welding …   Wikipedia

  • Atomic hydrogen welding — (AHW) is an arc welding process that uses an arc between two metal tungsten electrodes in a shielding atmosphere of hydrogen. The process was invented by Irving Langmuir in the course of his studies of atomic hydrogen. The electric arc… …   Wikipedia

  • Timeline of Russian inventions and technology records — The Hall of Space Technology in the Tsiolkovsky State Museum of the History of Cosmonautics, Kaluga, Russia. The exhibition includes the models and replicas of the following Russian inventions: the first satellite, Sputnik 1 (a ball under the… …   Wikipedia

  • Scuba diving — Not to be confused with Self contained breathing apparatus, which describes breathing sets used out of water. Scuba diver Scuba diving ( SCUBA originally being an acronym for self contained underwater breathing apparatus, now widely considered a… …   Wikipedia

  • List of Russian people — The Millennium of Russia monument in Veliky Novgorod, featuring the statues and reliefs of the most celebrated people in the first 1000 years of Russian history …   Wikipedia

  • USA armed forces divers — Contents 1 United States Navy 2 United States Army 3 United States Marine Corps …   Wikipedia

  • Divers Institute of Technology — Logo Divers Institute of Technology (DIT) is a private, for profit educational institution for the training of commercial divers. Founded in 1968 in Seattle, Washington, Divers Institute of Technology is located on the North end of Lake Union… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.