Underwater Welding
One of the highest-paying and highest-risk specializations in the industry — combining commercial diving with structural welding on subsea platforms, pipelines, and hulls.
Two Methods: Wet vs Hyperbaric (Dry)
Underwater welding splits into two fundamentally different techniques, each suited to different depths and repair types.
Wet Welding
The welder is directly submerged in water, using waterproof electrodes (typically SMAW with specially coated rods). It's faster to deploy — no habitat needs to be built — making it the go-to for emergency repairs and shallower depths, typically 30–400 ft. The tradeoff is weld quality: rapid cooling from surrounding water increases the risk of hydrogen embrittlement and porosity, so wet welds are generally not used for critical structural repairs without follow-up inspection and, often, replacement once feasible.
Hyperbaric (Dry) Welding
A sealed, pressurized habitat is built around the work area and purged of water, letting the welder work in a dry, controlled atmosphere at ambient pressure matching the surrounding water depth. Weld quality approaches that of a surface weld and can be X-rayed and inspected to the same structural standards. This is the method used for critical pipeline tie-ins, platform jacket repairs, and anything requiring code-quality welds. It's used down to roughly 1,000 meters in saturation diving operations, though most commercial hyperbaric welding happens well shallower than that extreme.
The Diver-Welder Combination
Underwater welders are, first and foremost, commercial divers. The welding certification (AWS D3.6M — Underwater Welding Code) is only half the qualification; the diving side requires certification through the Association of Commercial Diving Educators (ACDE) or an ADCI (Association of Diving Contractors International) accredited program, covering surface-supplied air diving, mixed-gas diving, and — for the deepest and highest-paying work — saturation diving.
Realistic Pay Expectations
Entry-level underwater welders, often working inland or in shallower inspection/light-repair roles, earn roughly $60,000–$80,000/year. Experienced offshore underwater welders performing hyperbaric structural work can earn $100,000–$150,000+, with saturation divers on extended offshore contracts sometimes exceeding this through depth pay and bonus structures. Pay is often structured around day rates plus depth pay, rather than flat salary — meaning income can vary significantly year to year depending on contract volume.
How to Get Into It
The typical path is to become certified and experienced in one discipline first — usually welding via standard welding certifications — then attend a dedicated commercial diving school with an underwater welding program, several of which combine both curricula into a single 7–10 month course. From there, most divers start with inland or inspection work to build hours before moving into offshore hyperbaric welding roles.