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Welding. UNDER WATER. Objectives…. Identify the equipment for underwater welding. Describe the underwater welding process. List the reasons for welding underwater. . Why Would You Weld Under Water?. It saves time. It can be cheaper. How Is It Done?. There are 3 main ways:

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welding

Welding

UNDER WATER

objectives
Objectives…
  • Identify the equipment for underwater welding.
  • Describe the underwater welding process.
  • List the reasons for welding underwater.

Welding: Underwater

why would you weld under water
Why Would You Weld Under Water?
  • It saves time.
  • It can be cheaper

Welding: Underwater

how is it done

How Is It Done?

  • There are 3 main ways:
  • Preparing an enclosure filled with gas (helium) under pressure and have the welder fitted with protective equipment.
  • Wet underwater method, where the power of the arc generates a bubble of mixture of gases and the welding is done, more or less, normally, with special electrodes.
  • Build a pit, near where the welding will occur and take the water out.
slide5
BUT…
  • The welder may need to learn how to dive first.

Welding: Underwater

disadvantages

DISADVANTAGES

Electric ShockDangerous GasesUnderwater Hazards

new processes

New Processes

A relatively new underwater welding process is “Friction Stud Welding”, which is used for military and commercial use.

questions
QUESTIONS?

Information courtesy of TWI & other sources.

Welding: Underwater

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