underwater robots & dangers
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10 Most Dangerous Sea Creatures | The Most 10 Of Everything

10 Most Dangerous Sea Creatures | The Most 10 Of Everything | underwater robots & dangers | Scoop.it
Better find a swimming pool or stay close to coast when you want to swim. Check out 10 Most Dangerous Sea Creatures
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David Virshup's comment, March 28, 2014 8:13 AM
Dangers 10.The 10 most dangerous sea creatures' are listed in order. Fire coral(10), Lionfish(9), Sea Snakes(8), Stingrays(7), Tiger Shark(6), Great White Shark(5), Stonefish(4), Blue-Ringed Octopus(3), Crocodiles(2), and Chironex(1). As you can see the shark are not the most dangerous sea creatures. Some of the most deadly creatures you have to look out for are under a foot long. The stonefish can grow up to 12" long and is very venomous. The Chironex Fleckeri or box jellyfish is the most dangerous aquatic creature and it is only found off the coast of Australia, Vietnam, New Guinea, and the Philippines. I will never underwater weld in these waters to avoid this dangerous sea creatures.
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Underwater Welding-Want To Learn More About It? Underwater Welding Risks

Underwater Welding-Want To Learn More About It? Underwater Welding Risks | underwater robots & dangers | Scoop.it
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David Virshup's comment, March 27, 2014 10:21 AM
Dangers 8.Another risk of underwater welding is a break down of dental amalgam(teeth). When you weld AC current creates a magnetic field. This field can break down your teeth. It only seems to happen in underwater welding and not normal welding. I bet the water has a lot to do with the break down of tooth amalgam.
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Pipa Bawah Laut: Underwater welding development and risk

Pipa Bawah Laut: Underwater welding development and risk | underwater robots & dangers | Scoop.it
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David Virshup's comment, March 27, 2014 7:53 AM
dangers 6.The risks are electric shock. Also it mentions hydrogen pockets of gas exploding. The nitrogen gets pushed to your joints while diving paralyzing divers. Drowning is another big risk. The dangers can be prevented. Nitrogen by using a Hyperbaric chamber,electric shock by using low voltage and an insulated suite, and explosions by watching the build up of gas that may explode.
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Underwater Welding: Get the facts about Underwater Welding

Underwater Welding: Get the facts about Underwater Welding | underwater robots & dangers | 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, March 26, 2014 10:10 AM
dangers 4.Electrical shock is a huge risk that underwater welders face. Hyperbaric welding in most cases solves this problem but in the one form of hyperbaric welding that you are half in the water you may still be at risk. Even though its safer employer's like wet welding because its cheaper. Electrical shock can also be prevented by testing and checking your gear. Hyperbaric welding is safer and helps prevent electrical shock.
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NAUI Dive Tables

NAUI Dive Tables | underwater robots & dangers | Scoop.it
NAUI Worldwide is the world's most respected, largest non-profit diver training
organization in the world. Established in 1959 as a membership association
and organized solely to support and promote Dive Safety Through Education, NAUI
continues as the recognized leader in innovative education. NAUI Worldwide members offer
a full range of training programs from Skin Diver through Instructor Course Director,
with dozens of specialty courses including Nitrox and technical diving. Thousands
of member instructors, dive businesses, resorts, and service centers are located
in countries throughout the world.
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David Virshup's comment, March 24, 2014 8:12 AM
dangers 2. This is a dive table that you can keep track of you nitrogen. Notice that if you wait 24 as a sit time your residual nitrogen is zero. To use the chart find your depth that you dove and who long you were down. Follow that down to the letter you are that tells you what diver you are and how much nitrogen is in your system. The second part of the chart is to show you how much time you get back for sitting between your dive. The 3 stage to the table is how deep are you going next dive. It will show you how long you can dive for at that depth.
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3162.pdf

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David Virshup's comment, March 11, 2014 8:18 AM
10.The article talks about the science of robotic underwater welding. By doing many tests. One of the tests says that the robot took 30% longer to weld the object when underwater. I think this is because the resist of the water because it is heavier. The weld showed a lack of penetration. There were no signs of hydrogen induced cracking. Also wet robotic welds have a lot of heat displacment. The metal did harden but not as much as they thought. The robot uses friction welding.
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Tu.2.5.2.pdf

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David Virshup's comment, March 7, 2014 10:19 AM
8. The grammagraphy robots are commonly remote operated. They are most useful when you have something needed to be gamma-graphed in a dangerous place or to deep for divers. The robot has an arm that grabs on to the pipe so it doesn't move or get pushed away by the current. The robot uses its other hand to put the film on the other side of the pipe. These robots are cutting edge and will save many lives from going down into the oceans dangers.
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China will master Marine welding key technology research of underwater welding robot--XUCHANG TIANHE WELDING DEVICE CO.,LTD.

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David Virshup's comment, March 6, 2014 10:13 AM
6.This news article talks about shengli oilfield offshore oil platforms, hong kong-zhuhai-macao bridge companies using this new underwater wet welding robot technology. The chinese developed this technology and the chinese are utilizing it. The robot is suppose to be the best nearly making welds as good as land welds. There next step is to market this product.
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653_wcndtfinal00654.pdf

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David Virshup's comment, March 6, 2014 8:17 AM
4.Patrobras' has developed many robots for underwater use but only some of them pertain to my project. One is the underwater Gammagraphy system. This system is like an xray but xrays can't be done underwater because the water will show up. So they use a shorter more Penitraiting wave length so they water doesn't show up. The xrays and gammagraphy works kinda weird. The xray shows a picture of the fill side not the side with the rays coming out of it. But the side the file is on. The other is the UT crab tool. This is a tool i would untilize to move pipe around the ocean floor to hold it in place.
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Lincoln Electric Robotic Mig Welding Demo at OGS Industries - YouTube

http://ogsindustries.com/robotic-mig-welding.php OGS Industries employs a Lincoln Electric System 10 and System 30 Robotic Mig Welding Cells. These Robotic W...
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I want this video to be my intro video to robotic underwater welding.  Because it has music.  It shows the consistency of a robot.  The speed of a robot.  And the precision of a robot.

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David Virshup's comment, February 26, 2014 8:10 AM
2>I want this video to be my intro video to robotic underwater welding. Because it has music. It shows the consistency of a robot. The speed of a robot. And the precision of a robot.
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Nitrogen Narcosis vs Decompression Sickness - Scuba Diving Information

Nitrogen Narcosis vs Decompression Sickness - Scuba Diving Information | underwater robots & dangers | Scoop.it
In scuba diving, nitrogen narcosis and decompression sickness are both caused by nitrogen gas. However, the two conditions have very different symptoms and treatments. Learn the difference between nitrogen narcosis and decompression sickness in scuba diving.
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David Virshup's comment, March 28, 2014 7:56 AM
dangers 9. Nitrogen narcosis and Decompression sickness are both caused by nitrogen but the nitrogen is in two different places. In Nitrogen Narcosis the nitrogen is breathed in. The symptoms are similar to feeling drunk or tipsy. Drinking and diving is not a good mixture. So you can see the risk on might be in if he/she has this during a dive. The deeper you go the more nitrogen you breathe in and the more loopy you can feel. Decompression sickness is when nitrogen bubbles form in the divers blood. The bubbles can block blood flow. The nitrogen comes from the tank you breathe.
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Shark Attack Scuba Diver Caught on video - YouTube

'http://divingaccidents.net/ http://www.facebook.com/divingaccidents Shark Attack Scuba Diver caught on video.
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David Virshup's comment, March 27, 2014 10:13 AM
Dangers 7.A shark attack video is a great example of dangers. The water creates big and small can hurt you. This is at the extremes of what an underwater welder might face. But it is still possible. Dangers aquatic animals are something to watch out for.
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Underwater Welding Dangers

Underwater Welding Dangers | underwater robots & dangers | Scoop.it
If you are interested in a career as an underwater welder, you will want to learn about the dangers of underwater welding to help you decide if this is the right career choice for you.
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David Virshup's comment, March 26, 2014 10:19 AM
dangers 5. This article seems to say that the underwater explosions from hydrogen and oxygen doesn't happen in wet welding. It happens in hyperbaric welding. The hydrogen builds up and heats up and causes an explosion. The explosion would be huge because hydrogen is highly explosive. I thought the risk was in wet welding in the heating of the water and turning it into gas that explodes. But it happens more in hyperbaric welding because the hydrogen and oxygen have no where to escape to.
Bedorian Thompson's curator insight, September 16, 2015 8:41 AM

If you're interested in something challenging...

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Underwater Welding Death Rate - FloridaMedicalMalpracticeLaws.com

Underwater Welding Death Rate - FloridaMedicalMalpracticeLaws.com | underwater robots & dangers | Scoop.it
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David Virshup's comment, March 26, 2014 8:05 AM
Dangers 3. The death rate is 13-17%. The average is 30 out of 200 die on the job. When welding underwater you need electric current. This is dangerous underwater but all risks can be eliminated by testing equipment. Possibility of hydrogen explosion from steaming water. Decompression sickness is a divers sickness where nitrogen is forces into the body by decreasing pressure(when your coming up from a dive). It's not really a problem with a hyperbaric chamber on site. Break down of dental amalgam may result in a metallic taste in your mouth. It is caused by being close to a magnetic field. Hearing impairment is a big risk I may run into. Cognitive issues is an injury from decompression sickness that may effect the memory and verbal reasoning. Drowning is only a problem you have have faulty equipment. The last danger is to encounter dangerous animals but the CDA instructor seemed to say that the aquatic life would stay away just like animals in the woods stay away from campers.
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underwater-welding.pdf

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David Virshup's comment, March 24, 2014 7:58 AM
dangers 1. Underwater welding is dangerous be cause it combines welding and diving. Both dangerous by themselves. But together they more then double the risk of death. The first danger is electricity and water do not mix. The second danger is water is made of H2o. The water is heated by the arc of the weld and creates steam bubbles. Those steam bubbles can explode because hydrogen (H) is highly explosive. The other danger is a diving risk. Nitrogen cause be forced into the blood by pressure of water surrounding you. There is a expectable amount of nitrogen that you can have. Also there is to much and to solve this nitrogen problems you can go into a decompression chamber.
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FP7339.PDF

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David Virshup's comment, March 10, 2014 7:56 AM
9. The article seems to say that in nuclear reactors there are problems in the tanks of water that surround the nuclear reactor. This water is not safe for human interaction because of radioactive waste so they need robots to do the laser welding repairs. The lazer had an advantage of a very small heat effected zone. This is good because it is underwater and the weld will cool down rapidly. So if you heat a big area of metal up and rapidly cool it you can have cracks. One of the great parts is know we don't need to drain the water from nuclear reactors to fix these cracks
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Underwater robots in Stavanger to get new workshop - Ruukki's delivery shortened construction time - Ruukki

Underwater robots in Stavanger to get new workshop - Ruukki's delivery shortened construction time - Ruukki | underwater robots & dangers | Scoop.it
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David Virshup's comment, March 7, 2014 8:02 AM
7. This article is good to show demand for the future. This article is about norwegian oil business. They had 400 diving jobs in 1970. 66 of those 400 lost there lives. The death rate was at 16.5%. They gradually replaced all the divers with robots, saving many lives.
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Hyperbaric Welding - YouTube

North Sea subsea hyperbaric welding ops.
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David Virshup's comment, March 6, 2014 8:16 AM
5.This video was already used in the other cutting edge topic of hyperbaric underwater welding. But the video also has a robot doing the weld in the hyperbaric chamber. The diver goes down and sets up this machine to weld the pipe. It welds a perfect bead because robots don't make mistakes. The robot held the filler metal consistantly a far distance away. Also it weaved constitantly to make a perfect weld.
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Underwater_robots_Tariq.pdf

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David Virshup's comment, March 5, 2014 10:07 AM
3. The robot that would be useful is the Nozzle inspection robot witch makes it way threw the inside of the pipe. The only trouble I see is if the robot its to big for the pipe it needs to inspect. The robot video tapes the inside of the pipe. This will help for visual inspection of the open root pass. I think you could put x ray equipment on it and use it for x raying from the inside of the pipe.
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wj0810-166.pdf

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David Virshup's comment, February 21, 2014 8:16 AM
Robotic welding1.This pfd by AWS(American Welding Society) states there is a high need for hot taping in gas and oil pipelines. But also that it is very dangerous. The paragraph goes on to say how robots perform better than humans. No human has the repeatability of a robot to make the perfect weld. Therefor I think it is logical to have robots do all underwater welding. But robots are not perfect. Because the electricity flows threw the whole rod were you start will metal slower then the end of the rod. If the robot travels at the same speed it will be putting to much metal at the end of the rod. Also the machines weren't getting good penetration. This combined with travel speed may cause the arc to go out. Also a welder must keep the rod after striking the arc to 1/8 away. Any more then that you might brake your arc or get defects in your weld. Any closer and you might stick you rod. This will cause a few problems having to throw away that rod or run the metal that has no flux on it. And having to clean the part you need to restart on. A robot again can hold the 1/8 away better than a human can.