Under water welding ppt
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Hyperbaric welding is the process in which a chamber is sealed around the structure to be welded and is filled with a gas ( He and Oxygen) at the prevailing pressure.
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Underwater welding
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Underwater welding is an important technique used for underwater fabrication. There are two main types: wet welding, where welding is performed directly under water using a special electrode, and dry welding, where an enclosed chamber is used to displace water and allow welding in a dry environment filled with gas. Wet welding is more common due to greater freedom of movement but has higher risks, while dry welding has higher costs but lower risks. Underwater welding requires higher currents than air welding due to water cooling the weld. It is used in offshore construction, ship repair, and salvage operations. Underwater welders require commercial diving certification and welding qualifications.UNDER WATER WELDING
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This document provides an overview of underwater welding, including a brief history, the two main types (wet and dry welding), advantages and disadvantages of each, applications, risks involved, safety rules, and future developments. It discusses how underwater welding was pioneered in the 1930s in Russia and how the techniques have evolved. Wet welding is done directly in water while dry welding uses an enclosed chamber. Underwater welding is used to repair ships, offshore platforms, and pipelines and allows construction in underwater environments. Safety is important due to risks like electric shock and gas explosions. The future of underwater welding may include increased automation and new techniques like friction welding.Under water welding
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Underwater welding is used for repairing offshore structures like oil rigs and pipelines. There are two main types: wet welding, where welding occurs directly in water using techniques like MMA; and dry welding, where a chamber is created to weld in a dry environment, with techniques like GTAW and GMAW. Wet welding is cheaper but results in poorer weld quality due to quenching, while dry welding produces higher quality welds but requires more complex and expensive equipment like hyperbaric chambers. Proper insulation and ventilation are needed to address risks like electric shock and gas accumulation. Underwater welding is an important but challenging field with ongoing research into deeper diving capabilities.Under water welding PPT
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the paper presentation which we fetched information through refering more ppts and journals. hope it may be useful guys. Underwater welding
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The document discusses underwater welding technology. It describes how underwater welding was first developed by the British Admiralty and then special waterproof electrodes were created. It discusses the different types of underwater welding including wet welding, dry welding using hyperbaric chambers, and different habitat sizes. It outlines the challenges of underwater welding including costs and equipment needs. It also discusses the welding processes, necessary equipment, safety considerations, and developing automation trends in the field.under water welding
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This document discusses two types of underwater welding: dry welding and wet welding. Dry welding takes place inside a sealed chamber filled with gas that is pressurized to the surrounding water pressure. It has advantages like welder safety and good weld quality but high costs. Wet welding occurs directly in water and is cheaper and faster but results in lower weld strength due to rapid cooling in water. The document provides details on the types, advantages, and disadvantages of each underwater welding method.Under water welding.smnr
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The document discusses underwater welding. It begins by explaining that underwater welding involves processes that join steel on offshore structures, pipelines, and ships underwater. It then covers the principles of underwater welding, classifications of wet and dry underwater welding, advantages and disadvantages of each method, risks and safety considerations, and applications of underwater welding such as offshore construction and ship repair. It concludes by discussing future developments in automation and new techniques like friction welding.UNDER WATER WELDING
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underwater welding is the process of welding at elevated pressures, normally underwater. Hyperbaric welding can either take place wet in the water itself or dry inside a specially constructed positive pressure enclosure and hence a dry environment. It is predominantly referred to as "hyperbaric welding" when used in a dry environment, and "underwater welding" when in a wet environment. The applications of hyperbaric welding are diverse—it is often used to repair ships, offshore oil platforms, and pipelines. Steel is the most common material welded.
Welding processes have become increasingly important in almost all manufacturing industries and for structural application.[5] Although a large number of techniques are available for welding in atmosphere, many of these techniques cannot be applied in offshore and marine application where presence of water is of major concern
Under water welding
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This document discusses underwater welding. It begins with an introduction stating that underwater welding allows for the assembly or repair of structures underwater. It then discusses the origin of underwater welding in the 1930s by a Russian metallurgist. There are two main types: dry welding using an enclosed chamber with elevated gas pressure, and wet welding directly exposed to water using special electrodes. Advantages include safety for dry welding and versatility for wet welding. Applications include offshore construction, shipbuilding, pipelines, salvaging sunken vessels, and oil refineries. The document concludes by discussing future areas of automation, mechanization, inspection techniques, and new welding methods.Underwater welding 1[1]![Underwater welding 1[1]](https://cdn.slidesharecdn.com/ss_thumbnails/underwaterwelding11-180325142223-thumbnail.jpg?width=560&fit=bounds)
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This document provides an overview of underwater welding, including its history, classifications, working principles, advantages, disadvantages, and applications. Underwater welding can be classified as either wet welding, where the welder works directly in water, or dry welding, where welding occurs inside a pressurized chamber. While wet welding is faster and cheaper, it produces lower quality welds compared to dry welding. Underwater welding is used for repairs of ships and structures and construction of pipelines and offshore oil rigs.Underwaterwelding 121020023417-phpaaa
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This document provides an overview of underwater welding. It discusses two main types: wet welding, which is performed directly in water using specialized electrodes, and dry welding, where a chamber is created to allow welding in a dry environment. Wet welding is cheaper and faster but results in lower quality welds due to poor visibility and rapid cooling in water. Dry welding allows for higher quality welds but is more expensive due to specialized equipment needs. Underwater welding has applications in offshore construction, ship repair, and salvage operations where it provides a means for metal fabrication and joining underwater.Technical seminar
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Underwater welding is a process similar to normal welding but performed underwater. It can be done through two methods - wet welding, which is done directly in water using waterproof electrodes, or dry welding, which uses a pressurized chamber filled with gas. Wet welding has advantages like minimal equipment needs and speed but risks like quenching and hydrogen embrittlement. Dry welding is safer but more complex and costly. Precautions must be taken to mitigate risks like electric shock, oxygen depletion, and pressure changes when underwater welding. Automation is increasingly being used to perform underwater welding.Dry welding and wet welding
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The document discusses two methods for underwater welding: wet welding and dry welding. Wet welding involves welding directly in water and has advantages such as being the cheapest and fastest method, but disadvantages such as poor visibility and risk of hydrogen embrittlement. Dry welding involves welding in a pressurized chamber and has advantages like better weld quality and worker safety, but higher costs associated with the complex equipment required. The document compares the pros and cons of each welding method.Underwater welding
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Welding processes have become increasingly important in almost all manufacturing industries and for structural application. Although a large number of techniques are available for welding in atmosphere, many of these techniques cannot be applied in offshore and marine application where presence of water is of major concern. In this regard, it is relevant to note that a great majority of offshore repairing and surfacing work is carried out at a relatively shallow depth, in the region intermittently covered by the water known as the splash zone. Though numerically, most ship repair and welding jobs are carried out at a shallow depth, the most technologically challenging task is repair at greater depths, especially in pipelines and repair of accidental failure. The advantages of underwater welding are largely of an economic nature, because underwater-welding for marine maintenance and repair jobs by passes the need to pull the structure out of the sea and saves valuable time and dry docking costs. It is also an important technique for emergency repairs which allow the damaged structure to be safely transported to dry facilities for permanent repair or scrapping. Underwater welding is applied in both inland and offshore environments, though seasonal weather inhibits offshore underwater welding during winter. In either location, surface supplied air is the most common diving method for underwater welders. Underwater welding is an important tool for underwater fabrication works.
Underwater hyperbaric welding was invented by the Russian metallurgist Konstantin Khrenov in 1932.
Hyperbaric welding is the process of welding at elevated pressures, normally underwater. Hyperbaric welding can either take place wet in the water itself or dry inside a specially constructed positive pressure enclosure and hence a dry environment. It is predominantly referred to as "hyperbaric welding" when used in a dry environment, and "underwater welding" when in a wet environment. The applications of hyperbaric welding are diverse—it is often used to repair ships, offshore oil platforms, and pipelines. Steel is the most common material welded.Under water welding
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Underwater welding can be classified as dry welding, which uses sealed chambers, or wet welding, which is performed directly in water. Dry welding produces higher quality welds but requires more complex and expensive equipment. Wet welding is more economical but results in lower weld quality due to water's quenching effect. The underwater environment affects welds by introducing hydrogen that causes embrittlement and oxygen that increases porosity. Weld quality declines with increasing depth due to higher pressures. Proper welding equipment and techniques can help reduce these negative impacts.Underwater welding
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Frictional welding is a solid-state welding process that uses relative motion and high force between two contacting workpieces to generate heat through friction and form a joint. There are different types of frictional welding processes defined by the motion used - linear, rotary, stir, radial, and orbital friction welding. Frictional welding produces joints with low surface impurities and narrow heat-affected zones. It can join similar and dissimilar metals for applications in automotive, aerospace, consumer products, medical, and other industries.Friction welding 
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Friction welding is a solid state joining process that uses mechanical friction to fuse materials together without melting. There are several types of friction welding including spin welding, linear friction welding, friction surfacing, and friction stir welding. The process involves rotating or oscillating one material against another under pressure to generate heat and plasticize the surfaces. Friction welding produces high quality welds with small heat affected zones and without the need for filler metals. It has advantages over other welding methods like lower heat input and cost. However, it is generally limited to flat geometries and small parts.Seminar on welding
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Underwater welding has been developed and improved over several decades. Some key developments include the first underwater welds by the British Admiralty in the 1940s, specialized waterproof electrodes created in the 1970s, and qualification of an underwater wet welding procedure to AWS standards. There are two main types of underwater welding - wet welding, which is done directly in the water, and dry welding, which uses pressurized habitats. Underwater welding is used for offshore construction, ship repair, salvaging sunken vessels, and repairing underwater pipelines. While it enables work in places not accessible otherwise, it also presents risks like hydrogen embrittlement and decompression sickness that require safety precautions.Underwaterwelding 
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Underwater welding is a specialized process that involves welding while submerged in water or in a pressurized environment. There are two main types of underwater welding - wet welding, which is done directly in water, and dry welding, which uses a pressurized habitat or chamber. Welding must account for the risks of hydrogen embrittlement, rapid quenching effects on material properties, and risks to the welder's health from changes in pressure. Precautions include adequate electrical insulation, venting of gases and voids, and monitoring the welder's safety. Automation of certain underwater welding tasks is also being developed to reduce risks.More Related Content
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Welding processes have become increasingly important in almost all manufacturing industries and for structural application. Although a large number of techniques are available for welding in atmosphere, many of these techniques cannot be applied in offshore and marine application where presence of water is of major concern. In this regard, it is relevant to note that a great majority of offshore repairing and surfacing work is carried out at a relatively shallow depth, in the region intermittently covered by the water known as the splash zone. Though numerically, most ship repair and welding jobs are carried out at a shallow depth, the most technologically challenging task is repair at greater depths, especially in pipelines and repair of accidental failure. The advantages of underwater welding are largely of an economic nature, because underwater-welding for marine maintenance and repair jobs by passes the need to pull the structure out of the sea and saves valuable time and dry docking costs. It is also an important technique for emergency repairs which allow the damaged structure to be safely transported to dry facilities for permanent repair or scrapping. Underwater welding is applied in both inland and offshore environments, though seasonal weather inhibits offshore underwater welding during winter. In either location, surface supplied air is the most common diving method for underwater welders. Underwater welding is an important tool for underwater fabrication works.
Underwater hyperbaric welding was invented by the Russian metallurgist Konstantin Khrenov in 1932.
Hyperbaric welding is the process of welding at elevated pressures, normally underwater. Hyperbaric welding can either take place wet in the water itself or dry inside a specially constructed positive pressure enclosure and hence a dry environment. It is predominantly referred to as "hyperbaric welding" when used in a dry environment, and "underwater welding" when in a wet environment. The applications of hyperbaric welding are diverse—it is often used to repair ships, offshore oil platforms, and pipelines. Steel is the most common material welded.Under water welding
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Liquid penetration testing involves applying a penetrant to the surface of a component to reveal surface-breaking flaws. The penetrant is drawn into flaws by capillary action and then removed from the surface and developed to highlight the flaws. The process involves cleaning, applying penetrant, removing excess penetrant, applying a developer, and visual inspection. It can detect small surface flaws but only on non-porous surfaces where the penetrant can enter flaws.Plastic welding
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Frictional welding is a solid-state welding process that uses relative motion and high force between two contacting workpieces to generate heat through friction and form a joint. There are different types of frictional welding processes defined by the motion used - linear, rotary, stir, radial, and orbital friction welding. Frictional welding produces joints with low surface impurities and narrow heat-affected zones. It can join similar and dissimilar metals for applications in automotive, aerospace, consumer products, medical, and other industries.Friction welding
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Underwater welding has been developed and improved over several decades. Some key developments include the first underwater welds by the British Admiralty in the 1940s, specialized waterproof electrodes created in the 1970s, and qualification of an underwater wet welding procedure to AWS standards. There are two main types of underwater welding - wet welding, which is done directly in the water, and dry welding, which uses pressurized habitats. Underwater welding is used for offshore construction, ship repair, salvaging sunken vessels, and repairing underwater pipelines. While it enables work in places not accessible otherwise, it also presents risks like hydrogen embrittlement and decompression sickness that require safety precautions.Underwaterwelding
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Underwater welding is a specialized process that involves welding while submerged in water or in a pressurized environment. There are two main types of underwater welding - wet welding, which is done directly in water, and dry welding, which uses a pressurized habitat or chamber. Welding must account for the risks of hydrogen embrittlement, rapid quenching effects on material properties, and risks to the welder's health from changes in pressure. Precautions include adequate electrical insulation, venting of gases and voids, and monitoring the welder's safety. Automation of certain underwater welding tasks is also being developed to reduce risks.underwaterwelding-121020023417-phpapp01.pptx.pdf
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Underwater welding can be classified as wet welding or dry welding. Wet welding is done directly in the water, while dry welding is done inside a sealed chamber filled with gas at the water pressure. The first underwater welding was done in Britain to seal ship rivets. Special electrodes were later developed to allow underwater welding. Dry welding produces high quality welds but is more expensive due to complex equipment needed. Wet welding is cheaper and faster though welds have lower strength due to rapid quenching. Precautions must be taken to prevent dangers like gas explosions and electric shock when underwater welding.Under water welding
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1) Underwater welding is used to repair structures like ships, oil rigs, and pipelines. It can be done wet in water or dry within a pressurized chamber.
2) Wet welding is simpler but produces lower quality welds due to quenching from water and hydrogen embrittlement. Dry welding allows better control but requires more complex equipment.
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Under water welding presentation.pptxARAVALI INSTITUTE OF TECHNICAL STUDIES
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1932 : soviet engineer Konstantin Khrenov made the first under water weld
in lab tests.
First under water welding was carried out by British Admiralty – Dockyard for
sealing leaking ships rivets below water line, in 1946.
In 1946, special waterproof electrodes were developed in Holland by
‘Van der Willingen’
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ESIT135 Problem Solving Using Python Notes of Unit-3 Under water welding ppt
- 1. Seminar On Underwater welding Submitted to: submitted by: Department of Mechanical MOHAN BIHARI engineering 12EEJME029 1
- 3. • First under water welding by British Admiralty – Dockyard • In 1946, special waterproof electrodes were developed in Holland by ‘Van der Willingen’ • 1970s: Whitey Grubbs and Dale Anderson of Chicago Bridge & Iron (CB&I) qualified an underwater wet welding procedure to American Welding Society (AWS) standards. 3
- 5. We cant lift ship and then repair it. Hence comes the use of underwater welding 5
- 6. •Wet welding •Dry welding 6
- 7. Hyperbaric welding is the process in which a chamber is sealed around the structure to be welded and is filled with a gas ( He and Oxygen) at the prevailing pressure. 7
- 8. Dry welding can be of two types •Large habitat •Mini habitat Mini habitat for underwater welding. 8 Large habitat for underwater welding
- 9. 9 Large habitat underwater welding
- 10. •Welder /diver safety •Good weld quality •Surface monitoring 10 • Higher cost of process, training, etc • Large quantity of costly and complex equipments • More deep, more energy requirement. • Cant weld if weld spot is at unreachable place
- 11. • Simply means that job is performed directly in the water • It involves using special rod and is similar to the process in ordinary air welding 11
- 12. 12
- 13. • Cheapest • Fastest • Tensile strength is high • Ease of access the weld spot • No waste of time in constructing habitat 13
- 14. • Rapid quenching decreases impact strength, Ductility. • Hydrogen embrittlement. • Poor visibility in water. • Higher energy density of hydrogen, higher efficiency. 14
- 15. 15
- 16. 16  Offshore construction for tapping sea resources.  Temporary repair work caused by ship’s collisions or unexpected accidents.  Salvaging vessels sunk in the sea.  Repair and maintenance of ships.  Construction of large ships beyond the capacity of existing docks. Repair and maintenance of underwater pipelines.
- 17. • Hydrogen and oxygen are dissociated from the water and will travel separately as bubbles • Oxygen cutting is about 60 percent efficient • Above river beds, especially in mud, because trapped methane gas in the proper concentrations can explode. 17
- 18. • There is a risk to the welder/diver of electric shock. • There is a risk that defects may remain undetected • The other main area of risk is to the life or health of the welder/diver from nitrogen introduced into the blood steam during exposure to air at increased pressure 18
- 19. • Start cutting at the highest point and work downward • By withdrawing the electrode every few seconds to allow water to enter the cut • Gases may be vented to the surface with a vent tube (flexible hose) secured in place from the high point where gases would collect to a position above the waterline. 19
- 20. • Precautions include achieving adequate electrical insulation of the welding equipment • Areas and voids must be vented or made inert 20
- 21. • Development of alternative welding methods like friction welding, explosive welding, and stud welding. • Present trend is towards automation. THOR – 1 (TIG Hyperbaric Orbital Robot) is developed where diver performs pipefitting, installs the track and orbital head on the pipe and the rest process is automated. 21
- 22. 22