Underwater welding guide covering wet welding and dry hyperbaric welding. Equipment, techniques, career paths, salary expectations, training requirements, and safety considerations for commercial diving welders.
Underwater welding splits into two categories: wet welding, where the welder and arc are exposed to water, and dry hyperbaric welding, where a pressurized chamber creates a dry environment around the joint at depth. Both require commercial diving certification on top of welding skills.
Wet welding uses stick electrodes with waterproof coatings in direct contact with the surrounding water. The water quenches the weld rapidly, which produces a harder, more brittle heat-affected zone compared to surface welding. Weld quality is lower than dry hyperbaric work, so wet welding is typically used for temporary repairs, non-critical structural members, and situations where mobilizing a habitat isn’t practical.
The standard electrodes are E6013 and E7014 types with waterproof flux coatings. DC polarity (electrode negative) is standard. Visibility, current, water temperature, and depth all affect the welder’s ability to produce sound joints.
Dry hyperbaric welding takes place inside a sealed habitat or chamber clamped around the joint. The water is displaced with gas, creating a dry environment at ambient pressure. This produces welds comparable to surface quality because the arc and molten metal behave normally. Saturation diving crews live in pressurized chambers for weeks at a time, transferring to the worksite in diving bells.
This method is used for critical pipeline repairs, offshore platform modifications, and any application where wet welding quality won’t meet the specification.
Most underwater welders start as commercial diving tenders, working the surface support role for 1-2 years before moving to diver status. Welding skills are developed in parallel. The career demands physical fitness, comfort in confined spaces, and tolerance for extended time away from home on offshore projects.
For related career information, see career paths. Back to welding applications.
Underwater welder salary breakdown. Covers surface pay, dive pay, saturation diving premiums, commercial dive school, physical requirements, and the life expectancy question.
Wet welding vs dry hyperbaric welding comparison. Covers quality differences, depth limitations, waterproof electrodes, habitat welding, cost analysis, and when to use each method.