Underwater Welding Explained: Salary, How It Works, and Risks

Some submerged structures, such as ship hulls, pipelines, and offshore platforms, cannot be easily removed from service for repair. Underwater welding makes certain in-place repairs possible by combining commercial diving with specialized welding procedures.

Depending on the job, welding may be performed directly in the water or inside a pressurized dry habitat. Both methods require trained commercial divers, surface support, specialized equipment, and careful safety planning.

This guide explains how underwater welding works, what underwater welders do, how their pay is reported, the major risks involved, and when a different welding method may be more suitable.

What Is Underwater Welding?

Underwater welding is a specialized form of welding used to join, repair, or modify metal structures below the water surface, either directly in the water or inside an enclosed, pressurized container.

Depending on the project, the same diver may perform inspection, cutting, cleaning, installation, structural repair, or other subsea maintenance tasks. Because welding work takes place underwater, the person performing it must also have the skills required for commercial diving.

How Underwater Welding Works: Types, Uses, and Limitations

Underwater welding can take place in two main scenarios: wet welding and dry hyperbaric welding.

Wet Underwater Welding

In wet welding, the diver-welder works directly in the surrounding water, most commonly using Shielded Metal Arc Welding (SMAW), or stick welding, with a waterproofed, flux-coated electrode.

The process itself is similar to welding on land: an arc is struck between the electrode and the base metal, and the flux coating burns off to form a gas bubble that shields the weld pool from the surrounding water. A waterproof coating helps protect the electrode before and during use.

Here’s how the wet welding process is carried out:

• Inspect and prepare the joint: The diver inspects the work area, removes marine growth, rust, and debris, and checks for hazards such as trapped gases, hydrocarbons, or restricted access.
• Position the electrode and control the power supply: The diver positions the waterproof electrode against the workpiece. A surface team member in voice communication with the diver controls the direct-current power supply, using the current specified for the electrode and approved welding procedure. Under OSHA requirements, the circuit should remain open except when the diver is actively welding.
• Make and inspect the weld: The diver strikes the arc and completes the weld using short, controlled passes. Slag and debris are removed as required between passes, so the weld can be inspected before additional weld metal is deposited.

Since the weld pool is in direct contact with the water, rapid quenching from the surrounding water increases hardness and cracking risk in the heat-affected zone. Hydrogen from dissociated water molecules can get trapped in the weld metal, raising the risk of hydrogen-induced cracking. Porosity is also more common, since gas bubbles have less opportunity to escape before the metal solidifies.

For the aforementioned reasons, this approach is often selected for rapid or lower-cost repairs because it requires less supporting infrastructure than dry hyperbaric welding. However, whether it is acceptable for a structural repair depends on the qualified procedure, inspection requirements, material, and required weld class. Dry hyperbaric welding is generally preferred when greater process and quality control is required.

Dry Hyperbaric Welding

In dry hyperbaric welding, a sealed chamber or habitat is placed around the repair area and filled with gas to displace the water. The welder then works inside this dry space.

Here’s how the dry welding process goes:

• Install and seal the habitat: A small enclosure around the joint or a larger habitat for one or more workers is positioned and sealed against the structure.
• Create a controlled dry environment: Water is displaced from the habitat, which is maintained close to the surrounding hydrostatic pressure. Depending on the depth and diving system, personnel may breathe a controlled helium–oxygen mixture, while the welding process uses a separate shielding gas.
• Perform the weld: Once dewatered, the welder works in a breathable, monitored atmosphere using conventional welding processes: GTAW and SMAW are the most common, with FCAW used less often.
• Inspect the repair: The controlled environment makes it easier to monitor the weld and perform the required inspection or non-destructive testing before the habitat is removed.

As the arc and weld pool aren’t directly connected to water, the metallurgical problems that plague wet welding- quenching, hydrogen pickup, porosity- are significantly reduced, and weld quality generally approaches what's achievable on land.

However, that quality comes at a cost. Habitat construction, gas supply, and pressure management add significant time, equipment, and expense, and depth still sets a hard ceiling on what's practical. Most hyperbaric work stays within roughly 1,000 to 1,300 feet, within limits humans can psychologically endure.

Given its difficulty in attempting and higher costs, hyperbaric welding is reserved almost only for critical structural repairs: pipeline tie-ins, primary structural members, anything where a weld failure would be catastrophic.

Where Is Underwater Welding Used?

Underwater welding is used wherever a structure is too large, fixed in place, or costly to remove from service for repair on land.

Common applications are presented in the following table:

In each case, the alternative: draining, dry-docking, or disassembling the structure is usually slower and far more expensive than sending a welder down to it directly.

Weld Quality and Limitations

In the U.S., underwater welds are classified under AWS D3.6, the Underwater Welding Code, which sorts welds into distinct classes based on how critical the application is:

• Class A: A quality level comparable to conventional above-water welding, used where the weld carries real structural load
• Class B: Allowed for less critical applications where some limited discontinuities are acceptable
• Class O: Designed to meet the requirements of another separately designated code or specification

Underwater welding is indeed necessary for structural and emergency underwater repairs. However, the underwater environment introduces several limitations that can restrict how and where a repair can be performed.

• Visibility and access: Murky water, silt, low light, and marine growth can leave a diver-welder with limited visibility and make it difficult to reach or manipulate the electrode around the joint. Tight joint geometry can also restrict the welding position.
• Water conditions: Strong currents, cold temperatures, waves, and contamination from fuel, chemicals, or other substances can make repairing unsafe or impractical. Marine growth may also need to be removed before welding.
• Material and thickness constraints: Not every material, thickness, or joint configuration is suitable for wet welding. Rapid cooling and hydrogen exposure can increase the risk of hardening and cracking in susceptible steels. For critical repairs, dry hyperbaric welding may provide better control.
• Limited process selection: Wet underwater welding is dominated by shielded metal arc welding (SMAW) because specially designed electrodes can operate in water. Processes such as GTAW and FCAW can be used in suitable dry hyperbaric environments. Laser welding has a limited usage too, though research on making it viable is ongoing.
• Dive bottom time: A diver's available working time is limited by depth, breathing gas, decompression requirements, and the diving system used. This limits how much welding can be completed during a single dive and can make larger repairs time-consuming.

Salary and Career: How Much Does an Underwater Welder Make?

Underwater welding is one of the highest-paying careers a welder can enter without a college degree, with salaries reported at two to three times a standard shop welder. Experienced offshore and saturation divers make around six figures a year.

What Does an Underwater Welder Actually Do?

Underwater welders perform maintenance, repairs, and construction on submerged metal structures. Their day-to-day job involves structural repairs on ships, pipeline welding, and cutting or installation work on offshore platforms. The job may also include inspection, rigging, cleaning, and other commercial diving duties that have nothing to do with striking an arc.

Most people in this field are commercial divers with specialized welding skills, rather than welders who occasionally work underwater. Safe diving practices, equipment handling, communication, and pressure management are fundamental to the job, while welding may account for only part of their working time.

The path to becoming an underwater welder looks like this:

Basic Welding Certification → Commercial diver certification → AWS Welding certification (Pipe/Structural Welding) → Wet and dry welding training

You may also see terms such as underwater diver welder, dive welder, scuba welder, subsea welder, and deep-sea welder, which are often used interchangeably to describe the same type of work.

Underwater Welding Salary and Employment

The U.S. Bureau of Labor Statistics does not publish a separate salary category for underwater welders. Instead, these workers are generally included under commercial divers, a broader occupation covering underwater inspection, repair, installation, cutting, and welding work.

Payment can be separated into 2 kinds: project based and full time jobs.

*Note: Annual income is sourced AWS official underwater welding career page; reflects the US wages. The hourly rate is estimated based on annual income and average salaries listed in ZipRecruiter. Sourced in August, 2026. Find more details in our welder salary guide by state and location.

Is Underwater Welding a Stable Career?

It is a niche trade, but a stable one for those who complete the training. Demand tracks closely with offshore energy development, pipeline maintenance, and aging marine and civil infrastructure.

Underwater welding jobs concentrate heavily around Gulf Coast states, coastal shipbuilding hubs, and areas with active offshore oil and gas operations. In the U.S., California and Florida show the highest demand for underwater welders. The Gulf Coast, particularly Louisiana and Texas, is also a major employment hub with high welding rates. Other opportunities exist in offshore regions of Australia, Norway, the Middle East, Singapore, and Brazil.

Why Is Underwater Welding So Dangerous?

Underwater welding is consistently ranked among the deadliest professions in the maritime industry, with a fatality rate that dwarfs onshore welding and other industrial jobs. There are the inherent hazards of commercial diving along with the risk of running an electrical arc in a conductive, submerged environment.

Diving and Environmental Hazards

Diving-associated risks include:

• Drowning: It’s the leading cause of death (around 70%) in this profession, caused by entanglement in hoses or umbilicals, differential pressure trapping a diver against an opening, loss of orientation in low visibility, or equipment failure cutting off breathing gas
• Decompression sickness: An improperly managed ascent after working at depth allows nitrogen bubbles to form in the bloodstream, which can be fatal without prompt treatment
• Hypothermia: The cold water pulls heat from the body faster than air, and extended exposure can lead to metabolic failure even with insulated gear
• Lung overexpansion: At depth, divers breathe gas under increased pressure. Ascending too quickly can cause the expanding gas in the lungs to overexpand the lungs and cause serious injury.
• Strong currents and poor visibility: Currents can make it difficult for a diver to maintain position around pipelines, piers, and offshore structures. Murky water can further reduce visibility.

Welding-Specific Hazards

Welding risks elevate in watery conditions, with common ones being:

• Electrocution: Water conducts electricity far more readily than air, so improperly insulated equipment or a compromised waterproof seal can send a fatal shock through the diver
• Explosions: The welding arc breaks down surrounding water into hydrogen and oxygen gas, which can pool in enclosed or overhead spaces and ignite
• Arc burns and thermal injury: Direct contact with the arc or heated metal remains a serious hazard, even underwater

What Is the Death Rate for Underwater Welders?

The lifetime underwater welding death rate is around 15%. By some comparisons, it is roughly 1,000 times more dangerous than the average industrial job and about 40 times deadlier than commercial diving as a whole, a field that's already considered high-risk.

Choosing the Right Welding Solution for Different Working Environments

The right welding process depends less on the metal and more on where the work has to happen.

Underwater welding solves the access problem. It prioritizes getting a repair done in place, under extreme environmental constraints, even at the cost of process complexity or weld quality.

Workshop fabrication starts from the opposite need: speed, precision, repeatability, and controlled heat input in a stable environment where the process can be optimized rather than merely made possible.

For that setting, laser welding can be a better fit. Among the available options, xTool MetalFab is a versatile system designed to make metal fabrication more accessible, combining fast welding with low heat input and reduced distortion. For workshops that don't need to fight the ocean to get the job done, it offers a simpler way to handle precise, repeatable welds.

Conclusion

Underwater welding makes critical repairs possible where conventional welding cannot reach, Though it is the highest paying welding job, one needs to consider the physical required fitness, rigorous trainings for both commercial diving and welding, and associated life risks before getting into it.

FAQs

1. How Do You Become an Underwater Welder?

Start with basic welding skills, earn a commercial diving certification from an accredited dive school, get AWS certifications (structural/pipe) and finish underwater welding-specific training to AWS D3.6 standards.

2. How Long Does It Take to Become an Underwater Welder?

Around 6 months to 2 years, for those with some basic welding and diving skills. For others, the journey could take 2 to 5 years including apprenticeships and specialized trainings.

3. Is Underwater Welding School Worth It?

Worth it if you're committed to the trade; accredited programs bundle the certifications employers actually require and connect graduates directly to hiring companies, cutting down the trial-and-error of piecing it together yourself.

4. How Deep Do Underwater Welders Go?

Most work happens between 30 – 130 feet, though offshore and saturation divers can go past 1,300 feet on the deepest jobs.

5. How Many Hours Can You Weld Underwater?

Bottom time per dive typically runs 2 to 6 hours depending on depth, but offshore schedules can add up to 40 – 80 hours of underwater work a week across multiple dives.

6. Can Laser Welding Be Used Underwater?

Yes, but only in controlled research settings so far. Mainly local-dry laser welding, where a gas shield displaces water at the joint. It produces strong, precise welds at shallow depths but remains an active research area, not yet a standard commercial technique