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Tags: Underwater, welding, Underwater welding, underwater welding dangers, underwater welding deaths, underwater welding degree, underwater welding death rate, underwater welding dangerous, underwater welding diver, underwater welding diving, underwater welding demand, underwater welding depth, underwater welding description, underwater welding books, underwater welding business, underwater welding benefits, underwater welding blogs, underwater welding basics, underwater welding bio, underwater welding bc,
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20-09-2008, 10:56 PM
Post: #1
Underwater welding
Underwater welding refers to a number of distinct welding processes that are performed underwater.

The two main categories of underwater welding techniques are wet underwater welding and dry underwater welding, or hyperbaric welding.

In wet underwater welding, a variation of shielded metal arc welding is commonly used, employing a waterproof electrode. Other processes that are used include flux-cored arc welding and friction welding. In each of these cases, the welding power supply is connected to the welding equipment through cables and hoses. The process is generally limited to low carbon equivalent steels, especially at greater depths, because of hydrogen-caused cracking.

In dry underwater welding the weld is performed at the prevailing pressure in a chamber filled with a gas mixture sealed around the structure being welded. For this process, gas tungsten arc welding is often used, and the resulting welds are generally of high integrity.

The applications of underwater welding are diverse?it is often used to repair and construct ships, offshore platforms, and pipelines. Steel is the most common material welded. For deep water welds and other applications where high strength is necessary, dry water welding is most commonly used. Research into using dry water welding at depths of up to 1000 m are ongoing. In general, assuring the integrity of underwater welds can be difficult, especially wet underwater welds, because defects are difficult to detect.

For the structures being welded by wet underwater welding, inspection following welding may be more difficult than for welds deposited in air. Assuring the integrity of such underwater welds may be more difficult, and there is a risk that defects may remain undetected.

The risks of underwater welding include the risk of electric shock to the welder. To prevent this, the welding equipment ought to be properly insulated, and the voltage of the welding equipment should be controlled. Underwater welders must also consider the safety issues that normal divers face; most notably, the risk of decompression sickness due to the increased pressure of inhaled breathing gases.

posted by christina at 11:50 AM 0 comments
Underwater welding refers to a number of distinct welding processes that are performed underwater.

The two main categories of underwater welding techniques are wet underwater welding and dry underwater welding, or hyperbaric welding.

In wet underwater welding, a variation of shielded metal arc welding is commonly used, employing a waterproof electrode. Other processes that are used include flux-cored arc welding and friction welding. In each of these cases, the welding power supply is connected to the welding equipment through cables and hoses. The process is generally limited to low carbon equivalent steels, especially at greater depths, because of hydrogen-caused cracking.

In dry underwater welding the weld is performed at the prevailing pressure in a chamber filled with a gas mixture sealed around the structure being welded. For this process, gas tungsten arc welding is often used, and the resulting welds are generally of high integrity.

The applications of underwater welding are diverse?it is often used to repair and construct ships, offshore platforms, and pipelines. Steel is the most common material welded. For deep water welds and other applications where high strength is necessary, dry water welding is most commonly used. Research into using dry water welding at depths of up to 1000 m are ongoing. In general, assuring the integrity of underwater welds can be difficult, especially wet underwater welds, because defects are difficult to detect.

For the structures being welded by wet underwater welding, inspection following welding may be more difficult than for welds deposited in air. Assuring the integrity of such underwater welds may be more difficult, and there is a risk that defects may remain undetected.

The risks of underwater welding include the risk of electric shock to the welder. To prevent this, the welding equipment ought to be properly insulated, and the voltage of the welding equipment should be controlled. Underwater welders must also consider the safety issues that normal divers face; most notably, the risk of decompression sickness due to the increased pressure of inhaled breathing gases.

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21-01-2010, 06:49 AM
Post: #2
RE: Underwater welding
hello...can u provide me the download link.
the topic seems to be interesting and new

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21-01-2010, 05:57 PM
Post: #3
RE: Underwater welding

Hi,
for more details read these articles:
http://www.statemaster.com/encyclopedia/...er-welding
http://www.freepatentsonline.com/3671707.html
http://en.wikipedia.org/wiki/Underwater_welding

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05-02-2010, 07:19 AM
Post: #4
RE: Underwater welding

.pdf  underwater welding.pdf (Size: 171.52 KB / Downloads: 1542)

.pdf  Underwater-Welding.pdf (Size: 27.11 KB / Downloads: 846)

Underwater welding is a type of welding which takes place underwater.In underwater welding, the environment around the welder is wet. and uses welding equipment which has been customized for wet environment,commonly use under water techniques are hyperbaric enclosure welding, wet Underwater-welding, high pressure water jet welding, other welding processes: friction welding, resistance welding, arc welding, tig welding, mig welding, oxyacetylene welding, electron beam welding, laser beam welding,and main risks for the welder performing Underwater-welding are the potential for electric shock,and the possibility of producing in the arc mixtures of hydrogen and oxygen in pockets, which might set up an explosion,and There are three main ways to perform Underwater-welding. One is to build an enclosure, a pit, around the place of repair and to pump away all the water: that amounts to prepare the conditions for normal welding in air, although the place may be deep under sea level. Another method of Underwater-welding consists in preparing an enclosure to be filled with gas (helium) under high pressure (hyperbaric) to push water back, and have the welder, fitted with breathing mask and other protective equipment, weld quite normally out of water but under pressure. The third is the wet Underwater-welding method, where no attempts are made to dry up the location of welding. Instead the power of the arc generates a bubble of a mixture of gases which lets metal melting and joining occur more or less normally, using specially covered electrodes to avoid that too much hydrogen be absorbed in the weld. The skilled welder must also be a diver, equipped for Underwater-welding, with all the extra equipment and protection a welder must use. There is also a less used method of Underwater-welding which features a special torch which sprays a cone of high pressure water, within which protective gas under pressure insulates the weld location from the water during welding.
for presentation of Underwater welding see http://www.ece.uwaterloo.ca/~ece434/Wint...tation.ppt

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16-02-2010, 07:55 PM
Post: #5
RE: Underwater welding

.pptx  UNDER WATER WELDING.pptx (Size: 164.21 KB / Downloads: 975)
INTRODUCTION

Underwater welding is an important tool for underwater fabrication works.
In 1946, special waterproof electrodes were developed in Holland by ËœVander Willingen'â„¢.
In recent years the number of offshore structures including oil drilling rigs, pipelines, platforms are being installed significantly.

CLASSIFICATION

¢ Under water welding can be classified as :
i. Wet welding
ii. Dry welding

WET WELDING

Key technology for repairing marine structure
Welding is performed under water directly exposed to the wet environment
Increased freedom movement makes more effective, efficient and economical
Supply is connected to the welder/driver via cables or hoses
Complete insulation of the cables and hoses are essential in case to prevent the chance for electric shock
MMA (Manual Metal Arc) welding is commonly used process in the repair of offshore platforms.

PRINCIPLE OF OPERATION

The work is connected to the positive side of dc source and electrode to the negative
The two parts of the circuit are brought together and then slightly separated
An electric current occurs in the gap and causes a sustained spark which melts the bare metal forming a weld pool The flux covering the electrode melts to provide a shielding gas.
Arc burns in the cavity formed inside the flux covering, which is designed to burn slower than the metal barrel to the electrode
Advantages

The versatility and low cost.
Less costlier than dry welding.
Speed with which it is carried out
No enclosures so no time is lost for building.

Disadvantages

Rapid quenching of the weld metal by the surrounding water.
Welders working under water are restricted in manipulating arc.
Hydrogen embrittlement causes cracks.
Poor visibility due to water contaminance.

DRY WELDING

A chamber is created near the area to be welded and the welder does the job by staying inside the chamber.
It produces high quality weld joints .
The gas-tungsten arc welding process is used mostly for pipe works
Gas metal arc welding is the best process for this welding.

Scope of further developments

Hyper baric welding is well established and generally well researched.
Research being carried out for welding at a range of 500 to 1000m deep.
THOR-1 (Tig Hyperbaric Orbital Robot) is developed where diver performs pipe fitting, installs the tracks and orbital head on the pipe and rest process is automated.

APPLICATIONS

Offshore construction for tapping sea resources
Temporary repair work caused by shipâ„¢s collisions, unexpected accidents
Salvaging vessels sunk in the sea
Repair and maintenance of ships
Construction of large ships beyond the capacity of existing docks

CONCLUSION

Alternatives which include clamped and grouted repairs (which may introduce unacceptably high loading on offshore structures) and the use of bolted flanges for the tie-ins are not necessarily and are not always satisfactory

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