Underwater welding, also known as hyperbaric welding, involves welding at elevated pressures. The welding can either take place in the water itself (known as wet welding) or in a dry, pressurised enclosure (known as dry welding), with steel being the most commonly welded material. The term ‘hyperbaric welding’ is usually used when referring to dry welding and ‘underwater welding’ for wet environments. Dry welds tend to be better quality than wet welds because of the greater control over the weld

Underwater Welding Dangers and Safety | WelditU