Underwater welding requires an intensive combination of skills and training that requires an individual to be certified as both, a certified welder and a commercial diver.

What is Welding?

Welding is a fabrication process that melts metal pieces and adding a filler material, creating a pool of molten material, also known as the weld puddle, which cools to become a strong joint.

Welding is different from soldering as soldering involves the melting of materials with a lower melting point material.

Using the techniques of underwater welding, it helps provides the opportunity for subsea engineering, such as the repairing of damaged structures or vessels, without surfacing the vessel.

The other aspect of a underwater diver is about demolition underwater and for that topic you can read what is underwater demolition.