under water welding

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

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UNDER WATER WELDINGMD. ADIL14 MEB 119S. No. 26GG 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 Refrences2

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..

5Arc is an electric current flowing between two electrodes through an ionized column of gas.

Continued..

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Classification..

Broadly divided into two types

Dry weldingWet welding7

Dry welding water is sucked out Cabin is made

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Wet welding

9Job is performed directly in water

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

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. 12

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.16

Applications. Repairing of pipelines. Oil is being extracted from a large depth in the sea.

17 Welding of pipeline

Continued..

18Repairing of shipsMaintainance of naval objects.

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.20

Friction welding

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

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