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UNDER WATER WELDING
MD. ADIL
14 MEB 119
S. No. 26
GG 0540

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Outlines..
• Introduction and history
• Importance of underwater welding
• Principle of operation
• Classification
• Advantages and Disadvantages
• Risks involved and Safety
• Applications
• future Scope
• Conclusion
• Refrences
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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
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Importance of Underwater welding
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Principle of operation..
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 Arc is an electric current flowing between two electrodes through an
ionized column of gas.

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Continued..
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Classification..
 Broadly divided into two types
Dry welding Wet welding
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Dry welding
 water is sucked out
 Cabin is made
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Wet welding
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 Job is performed directly in
water

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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.
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Disadvantages of wet welding
 Rapid quenching reduces impact strength and ductility.
 Poor visibility due to contamination of water.
 Hydrogen embrittlement cracks.
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Advantages of dry welding
 Better safety of diver.
 Good quality of welds.
 No fear of shock for welder.
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Disadvantages of dry welding
 Higher cost of training and process.
 It cannot approach to unreachable place.
 Large quantity of heavy and costly equipments.
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Risks involved
 Chances of electric shock.
 Possibility of an explosion.
 Decompression sickness.
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Continued..
 Danger of “ delta p” pressure .
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Safety measures..
 Proper training
 Proper insulated suit for welder.
 Avoid formation of gas bubbles to avoid explosion.
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Applications.
 Repairing of pipelines.
 Oil is being extracted from a
large depth in the sea.
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Welding of pipeline

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Continued..
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 Repairing of ships
 Maintainance of naval
objects.

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Live video of underwater(wet) welding.
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Future scopes..
 Development of alternate methods like friction welding ,explosion
welding etc.
 Proceeding towards the automation
of underwater welding.
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Friction welding

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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 .
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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
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THANK YOU