Cutting edge topic, dry underwater welding
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Underwater welding

It is the welding process done inside the water with the help of two methods : Dry Welding and Wet Welding.
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Welding Aluminum Underwater | Lincoln Electric

Welding Aluminum Underwater | Lincoln Electric | Cutting edge topic, dry underwater welding | Scoop.it
Lincoln Electric supplies Phoenix International with welding equipment and consumables needed to develop a GMAW procedure for performing underwater dry-chamber aluminum-welding repairs.
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David Virshup's comment, February 20, 2014 8:04 AM
9.Because aluminum welding is better with TIG and not stick welding. They haven't found a way to make aluminum wet welds with high quality weld. So hyperbaric welds are the only option other then dry docking(to pull the ship out of the water). Also the website has a welding machine located 24ft underwater. The hyperbaric chamber has elevated pressure witch means the air needs to find a way up above water. This puts a lot of stress on the top and sides of the structure.
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David Virshup's comment, February 16, 2014 2:24 PM
7.This source classifies four ways to dry underwater weld. The first is a dry underwater habitat. This type is the type where you have a large space were they displaced or moved the water from the weldement. This dry welding would be the one that has a controlled environment with a heating system. Dry chamber welding would be a smaller area that has an open bottom to the chamber and the diver is in the water with only his head and shoulders out of the water to do the weld. The next is dry spot welding witch the chamber is small and filled with shielding gas helium or argon. The welders arms are only out of the water because it is not a breathable atmosphere. Cofferdam welding is when you have a closed bottom and sides and the sides extent all the way to the surface. This creates a dry welding area like it you take a buck and push it down but don't let the top of the buck under the water.
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Underwater Welding: Get the facts about Underwater Welding

Underwater Welding: Get the facts about Underwater Welding | Cutting edge topic, dry underwater welding | Scoop.it
Underwater Welding: Get the facts about Underwater Welding and how to start a career in this exciting field! Earn a massive Underwater Welding salary now!
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David Virshup's comment, February 15, 2014 4:30 PM
5.This sight briefly hits on the history and different between wet and dry underwater welding. But this sight gave me some additional information compared to the other sights. The new information is about the pay of a hyperbaric welder is $100,000 or more. Also it goes into the leaves of divers class A,B and C. Class A would be the highest skill leave of an underwater welder.
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National Hyperbaric Centre - Hyperbaric Welding & Hot Tapping

Hot Tapping by Acergy using the National Hyperbaric Centre's hyperbaric welding facilities.
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David Virshup's comment, February 14, 2014 8:13 AM
3.The welders in this video are in one of these hyperbaric chambers. They where stick welding with 7018 or 11018 depending on the specifications. It was cool to watch them work as a team and start welding at the same time to prevent ether of them from getting flashed from the others arc. To grind between every pass like that tells me it was a very quality weld to make sure nothing is left (porosity or slag) in the weld. The video was from 2008 but dry welding has not changed that much from now to then.
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Underwater Welding Guide

Underwater Welding Guide | Cutting edge topic, dry underwater welding | Scoop.it
Underwater Welding Information, Careers, and Jobs
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David Virshup's comment, February 12, 2014 10:02 AM
1. This source beliefly talks about dry underwater welding or hyperbaric welding. This is when you take a submarine like ship that opens up and closes around the water. Then it pumps out the water. This creates a dry welding envirement in witch you can weld very safely in. The making of this dry chamber to weld is time consuming but it increases your chances of making a quality weld significantly.
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Nord Stream Hyperbaric Tie-ins - YouTube

The Nord Stream Project is installing two 48" gas export pipelines from Vyborg in Russia to Greifswald in Germany, through the Gulf of Finland and the Baltic...
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David Virshup's comment, February 20, 2014 8:18 AM
10.This is a video aobut a project Nord Stream did about the underwater pipe tie ins. It shows the pipe lining up. Also it shows a simulation of what happened get these pipes to line up. It shows cranes off of boats to move the excess pipe. It also shows the balloons the put on the pipe to line it up and attach them.
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wj0606-52.pdf

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David Virshup's comment, February 20, 2014 7:57 AM
8.Hyperbaric welding Laboratory has a pressure chamber the simulates the pressure chamber environment rated for 100 bars. Bar stands for barometric pressure. The weld is controlled by a computer station were the operator can change the robots actions if the video camera shows the weld isn't right. The robot creates a narrow groove to the pipe and can do open root. The robot PRS has been used to make 71 hyperbaric welds in 2006.
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LeHardy.pdf

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David Virshup's comment, February 16, 2014 12:52 PM
6.This power point for the navy 2010 gives great insight to the history and advances in the underwater welding field. In the 1930's Konstantin khrenov a Russian how studied metallurgy had a brake threw and made the first underwater weld. Though this weld was not to a high quality. In the 1940's underwater plasma cutting was used to salvage many ships at pearl harbor in WW2. In 1970's whitney Brubbs and Dale Anderson produces a quality underwater weld. This was the break threw that underwater welding need to get big. Because you no longer needed to dry underwater weld. The cost of it all will go down excessively.
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Hyperbaric Welding - YouTube

North Sea subsea hyperbaric welding ops.
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David Virshup's comment, February 15, 2014 2:27 PM
4.This is a better video that shows a lot more about hyperbaric welding. It shows the structure going down. Also it shows the monitors on the surface doing there job. The underwater welder goes down with not a tank on his back for oxygen but a tube so they can pump air down. This is how most commercial diving works. The most interesting thing about this video is the robot they does the weld. The robot produces a perfect weld.
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underwater-welding.pdf

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David Virshup's comment, February 14, 2014 8:02 AM
2.This source has a section about Hyperbaric welding or dry underwater welding. To make a dry underwater weld you must weld in a sealed chamber. This chamber is filled with a breathable mixture of helium and oxygen. It also says like the other source said witch is the process will produce a higher quality weld. The chamber has an open bottom to it like a cave. The disadvantages are a lot of expensive equipment, the jobs are around 80,000. The structure in dry welding has its own enviromental control system to protect you from cold water surrounding you. The x-rays or other non-destructive test can be administrated easy in the dry environment.