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UNDER WATER WELDING MD. ADIL 14 MEB 119 S. No. 26 GG 0540
Outlines.. • Introduction and history • Importance of underwater welding • Principle of operation • Classification • Advan...
Introduction and History.. Process of welding underwater or elevated pressures  Khrenov , a Russian engineer, In 1932 in...
Importance of Underwater welding 4
Principle of operation.. 5  Arc is an electric current flowing between two electrodes through an ionized column of gas.
Continued.. 6
Classification..  Broadly divided into two types Dry welding Wet welding 7
Dry welding  water is sucked out  Cabin is made 8
Wet welding 9  Job is performed directly in water
Advantages of wet welding  No enclosure or cabin is required.  Easily reachable to any type of portion.  Minimum amount...
Disadvantages of wet welding  Rapid quenching reduces impact strength and ductility.  Poor visibility due to contaminati...
Advantages of dry welding  Better safety of diver.  Good quality of welds.  No fear of shock for welder. 12
Disadvantages of dry welding  Higher cost of training and process.  It cannot approach to unreachable place.  Large qua...
Risks involved  Chances of electric shock.  Possibility of an explosion.  Decompression sickness. 14
Continued..  Danger of “ delta p” pressure . 15
Safety measures..  Proper training  Proper insulated suit for welder.  Avoid formation of gas bubbles to avoid explosio...
Applications.  Repairing of pipelines.  Oil is being extracted from a large depth in the sea. 17 Welding of pipeline
Continued.. 18  Repairing of ships  Maintainance of naval objects.
Live video of underwater(wet) welding. 19
Future scopes..  Development of alternate methods like friction welding ,explosion welding etc.  Proceeding towards the ...
Conclusion.. • Underwater welding is a very advanced technique. It helps up a lot in our activities. • But still it is nee...
Refrences  www.slideshare.net  www.weldpedia.com  www.wikihow.com/Weld-Underwater  www.banglajol.info/index.php/JNAME/...
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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

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UNDER WATER WELDING

  1. 1. UNDER WATER WELDING MD. ADIL 14 MEB 119 S. No. 26 GG 0540
  2. 2. Outlines.. • Introduction and history • Importance of underwater welding • Principle of operation • Classification • Advantages and Disadvantages • Risks involved and Safety • Applications • future Scope • Conclusion • Refrences 2
  3. 3. Introduction and History.. Process of welding underwater or elevated pressures  Khrenov , a Russian engineer, In 1932 invented the under- water welding.  In 1946,First water proof electrode made in Holland by Van der Willingen 3
  4. 4. Importance of Underwater welding 4
  5. 5. Principle of operation.. 5  Arc is an electric current flowing between two electrodes through an ionized column of gas.
  6. 6. Continued.. 6
  7. 7. Classification..  Broadly divided into two types Dry welding Wet welding 7
  8. 8. Dry welding  water is sucked out  Cabin is made 8
  9. 9. Wet welding 9  Job is performed directly in water
  10. 10. Advantages of wet welding  No enclosure or cabin is required.  Easily reachable to any type of portion.  Minimum amount of equipment is required.  High operating speed. 10
  11. 11. Disadvantages of wet welding  Rapid quenching reduces impact strength and ductility.  Poor visibility due to contamination of water.  Hydrogen embrittlement cracks. 11
  12. 12. Advantages of dry welding  Better safety of diver.  Good quality of welds.  No fear of shock for welder. 12
  13. 13. Disadvantages of dry welding  Higher cost of training and process.  It cannot approach to unreachable place.  Large quantity of heavy and costly equipments. 13
  14. 14. Risks involved  Chances of electric shock.  Possibility of an explosion.  Decompression sickness. 14
  15. 15. Continued..  Danger of “ delta p” pressure . 15
  16. 16. Safety measures..  Proper training  Proper insulated suit for welder.  Avoid formation of gas bubbles to avoid explosion. 16
  17. 17. Applications.  Repairing of pipelines.  Oil is being extracted from a large depth in the sea. 17 Welding of pipeline
  18. 18. Continued.. 18  Repairing of ships  Maintainance of naval objects.
  19. 19. Live video of underwater(wet) welding. 19
  20. 20. Future scopes..  Development of alternate methods like friction welding ,explosion welding etc.  Proceeding towards the automation of underwater welding. 20 Friction welding
  21. 21. Conclusion.. • Underwater welding is a very advanced technique. It helps up a lot in our activities. • But still it is needed Improvement to avoid accidents and explosion . 21
  22. 22. Refrences  www.slideshare.net  www.weldpedia.com  www.wikihow.com/Weld-Underwater  www.banglajol.info/index.php/JNAME/article/view/927/993  www.google.com/search 22
  23. 23. THANK YOU

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