Offshore Welding Companies: Services, Codes & Hiring Guide

Open the brochure and you see a diver in a helmet, torch in hand, blue water all around. Open the contractor’s mobilization file and you see crew rotation rosters, vessel charter agreements, calibration certificates, welder qualification cards with expiry dates, and a procedure a third party still has to sign off on. That second folder decides whether the job happens. A credible offshore welding company is not a welding shop with a boat. It is a small industrial organism where people, certifications, and iron all have to line up on the same calendar day.

The People Behind a Single Weld

A productive spread carries more specialists than most clients expect. The welder-diver is the visible one, but a dozen people stand behind that arc:

• Diver-welders (welder-divers): the ones in the water, usually working in pairs with a standby diver ready.
• Diving supervisors and superintendents: run the dive plan, control the bell, and hold stop-work authority.
• Life support technicians and saturation operators: manage chamber atmosphere, gas mixes, and the slow decompression that ends a campaign.
• NDT technicians: perform UT, MPI, ACFM, or A-scan on the finished weld, ideally independent of the welding crew.
• Welding engineers and QA/QC inspectors: own the WPS, the qualification records, and the acceptance criteria.
• Project managers, HSE advisers, and marine coordinators: handle scheduling, permits, vessel interfaces, and the paperwork that keeps a classification society satisfied.

How Welder-Divers Actually Get Qualified

No one walks offshore with a welding ticket and a wetsuit. Commercial diver training comes first, covering diving physics, chamber operations, underwater tools, and emergency procedures long before welding specialization begins. In the US, dive operations fall under OSHA’s commercial diving rules, and most contractors build their programs around consensus standards from the Association of Diving Contractors International or guidance published by IMCA.

Welding is a second, separate qualification. A welder-diver usually needs both a diving qualification and a distinct welding procedure or welder qualification test, often to AWS D3.6M or ISO 15618, performed in the position, class, and material the job requires. The AWS career overview for underwater welders is blunt about this: the trade is a stack of credentials, not a single certificate. Add NDT certification through ASNT or an equivalent body, offshore survival and sea-survival training of the BOSIET/HUET type, and a current offshore medical, and you have a rough picture of one crew member’s file. For welders from a marine fabrication background, the practical skills in AJ Marine Welding: Processes, Standards, Safety and Best Practices translate well, but they do not replace dive school or a pressure-qualified test.

The Assets That Let a Contractor Say Yes

Equipment is where ambition meets capital. A real offshore welding organization owns or reliably charters dive support vessels, saturation systems, diving bells, habitats, decompression chambers, welding power sources rated for wet or chamber conditions, and ROV support. Saturation crews live in a pressurized chamber system for the duration of a campaign, often on multi-week rotations, so the chamber plant is not optional kit. It is the hotel, the workshop, and the hospital rolled into one.

Mobilization Is the Real Bottleneck

Clients often assume the hard part is the weld. It is not. Mobilization means chartering a vessel in a market where tonnage is booked months out, assembling and testing the spread, loading out consumables and spares, getting client-approved procedures in place, and arranging third-party verification, which is standard on classified assets and any work an insurer is watching closely. Each step has a lead time, and they run in parallel only if someone competent is managing them.

Crew Rotation and the Fatigue Nobody Budgets For

Offshore crews work compressed rotations, and saturation campaigns stretch them further because decompression time is built into the schedule. Fatigue degrades judgment before it degrades hands, which is the wrong order inside a habitat where a gas pocket or a stray current deserves an instant reaction. Good contractors plan rotation with rest margins and treat a tired diver as a hazard, not a staffing inconvenience. The specifics of welding and burning underwater sit in OSHA 1910.424, and the AWS D3.6M framework assumes procedures and personnel are controlled, not improvised at 3 a.m. An organization that can name its vessel, list its crew’s credential expiry dates, and show a signed procedure is the one still standing when the weather window opens.

Codes, Standards, and Compliance: What a Legitimate Contractor Must Document

Offshore welding compliance is not a vibe. It is a paper trail. Anyone can claim they “work to AWS and OSHA,” but a legitimate contractor can hand you a document set that traces every weld from the procedure that governed it, to the welder who made it, to the technician who inspected it, to the calibration certificate of the machine that measured it. That chain is what you are actually buying when you pay for a qualified offshore welding company.

This section walks through the standards that govern the work, and then the specific documents a buyer should demand before mobilization. If you are a welder rather than a buyer, read it as a map of the qualifications that will be asked for at the dock.

The US Baseline: OSHA 29 CFR 1910 Subpart T

In the United States, commercial diving sits under OSHA’s commercial diving operations standard, 29 CFR 1910 Subpart T. It covers the dive team composition, safe practices manual, equipment inspection, decompression procedures, and recordkeeping. It is a performance-oriented standard: it tells you what must be achieved and documented, not exactly which brand of hat to buy.

Two provisions matter specifically for welding. First, 1910.424 addresses welding and burning operations directly, including the requirement that the dive team include a designated person to tend the welding leads and that the welding circuit be isolated or de-energized when not in use. Second, 1910.422 requires procedures covering the tasks at hand, which is where the dive plan, risk assessment, and welding procedure all have to line up.

The part people miss is the electrical prohibition. Underwater welding power sources must not be energized with the electrode holder in the water unless welding is actively being performed, and switches must be under the positive control of the welder-diver. Improvised setups — a surface machine run straight into the water, a return path through the structure instead of a dedicated cable, an impressed current cathodic protection system left live — are the classic shortcuts that turn a repair job into a fatality report.

AWS D3.6M: The Underwater Welding Rulebook

AWS D3.6M:2017 is the specification for underwater welding. It sets out qualification requirements for procedures and welders, weld classes, inspection criteria, and acceptance standards. When a specification says “Class A,” “Class B,” or “Class O,” it is referencing this document.

The class is the single most consequential line on the drawing. Class A is the most demanding, requires the most extensive qualification and inspection, and is generally associated with critical structural joints where fitness for purpose must approach surface-welded quality. Class B covers less critical work. Class O is for applications where serviceability is judged by other means — often temporary or non-structural repairs. The class you select dictates the welding method, the NDT extent, and therefore the price.

Reminder from the earlier section: “Class A” gets thrown around in sales conversations far too loosely. It should be written into the specification, not agreed verbally.

International Diver-Welder Qualification: ISO 15618-1 and 15618-2

Outside the US, and often alongside AWS in the US, qualification follows ISO 15618. Part 1 covers wet welding and part 2 covers dry hyperbaric welding. Both qualify a welder for specific conditions, and neither is a general licence to weld anything underwater. If your project is in the North Sea, West Africa, or the Middle East, expect ISO 15618 to be the reference rather than AWS alone.

Classification Societies and Flag States

For classed mobile offshore units, FPSOs, and many fixed installations, classification societies such as ABS, DNV, Lloyd’s Register, and Bureau Veritas can require survey and approval of repairs. That means the repair procedure may need class review before work starts and class attendance at defined hold points. Skipping that step produces a sound weld on an asset that is technically out of class — an expensive outcome at the next survey.

Flag state and coastal state requirements sit on top of that, and in US federal waters the Bureau of Safety and Environmental Enforcement governs offshore operations. Pipeline work commonly references API standards and client specifications, which frequently exceed the code minimums.

Industry Guidance: IMCA and ADCI

Diving contractors typically align with IMCA guidance internationally or ADCI consensus standards in the US. These are not laws, but they define what a professional diving operation looks like — crew competency, equipment auditing, and incident reporting conventions that insurers and clients expect to see.

The Document Set to Demand

For welders building a career offshore, the qualification path is cumulative: a recognized welding foundation, then diver-welder training, then class-specific qualification. Guides such as Aluminium Welding Course: What You Learn, Costs & Careers are a useful reminder that the aluminium skills common in marine and boat work transfer less directly to offshore structural steel than people assume.

One practical habit separates good buyers from lucky ones: read the WPS yourself rather than trusting the cover sheet. Check that the qualified thickness range covers the actual member, that the depth range covers the actual water depth, and that the class on the WPS matches the class on the drawing. That five-minute review catches more problems than any amount of contractor reassurance.

The fatality-rate myth

One figure that never seems to die is the widely quoted “15% lifetime fatality rate” for underwater welders. The problem with it is simple: it’s an extrapolation from limited data, not an official statistic. There is no single, reliable denominator that tracks every diver-welder, the exact hours they logged, or how long they stayed in the trade. Grouping wet welding, saturation diving, and other exposures together only makes those numbers less accurate.

That doesn’t downplay the danger at all. It means extrapolated lifetime-risk claims are a poor substitute for incident data from regulators and industry bodies. For a more realistic view, it’s far more worthwhile to look to resources from the Bureau of Safety and Environmental Enforcement (BSEE), IMCA, or ADCI. Even safety-focused industry commentary, such as the AWS Welding Digest, puts its focus where it belongs: prevention and controls, not internet scare quotes.

Insurance, liability, and why paperwork gets strict

Behind every hold point, calibration record, and procedure review is an underwriter. Offshore welding insurance is expensive, and insurers are often the ones driving specification strictness. One serious incident can exceed the value of an entire contract, so they push for verifiable controls before a single amp is turned on.

This affects both sides. For a contractor, a vague scope, expired certificates, or untraceable equipment is an uninsurable risk. For the client, contractor liability doesn’t remove their own duty to define defect criticality, weld class, and acceptance criteria. The more ambiguous either of those are, the more expensive the job becomes. A legitimate contractor won’t see this paperwork as a nuisance, they’ll see it as the price of keeping their crew and their spread insurable.

How to judge a safety culture before you sign

Certificates prove someone passed a test. Culture is proven when things start going wrong. Before awarding a job, look for tangible signs. Is stop-work authority actually used by the crew, or only written in a safety manual? Are near-misses reported without fear of punishment? Can they show gas monitor calibrations, bell or chamber checks, standby diver readiness, and their most recent emergency drill? Most importantly, ask for a reference call about a repair that didn’t go to plan, not just the ones that did.

Pay attention to the human factor as well. Fatigue is one of the most underrated safety variables on an offshore spread. Long transits, back-to-back mobilizations, shift work, and crew rotation all eat away at reaction time. A contractor that actively plans for this is buying margin for error, not losing productivity. These are the exact discipline-based controls that are reinforced in guides covering AJ Marine Welding, where safety is treated as a procedure, not a personality trait.

At the end of the day, offshore welding will never be zero-risk. The mark of a professional isn’t bravado, it’s restraint. The best contractors don’t try to talk a job into being safe. They can point to their lockout points, their gas readings, their chamber readiness, and above all, their willingness to say no when the conditions won’t allow a safe repair.

How to Vet and Hire an Offshore Welding Company: A Due-Diligence Checklist

Vetting an offshore welding contractor is not a personality test. It is an evidence test. The company that answers emails fastest is rarely the one that can put a qualified diver-welder into a habitat at 90 feet with a validated procedure behind him. Work through five stages in order, and stop the process the moment a stage fails.

Stage 1: Define the Scope Before You Shop

You cannot compare quotes for a defect you have not described. Before contacting anyone, write down the defect type and dimensions, the criticality of the affected member, the weld class you require, the governing code, acceptance criteria and NDT extent. Then ask the harder question: is a weld even the right repair? Sometimes a mechanical clamp, a grouted sleeve or a bolted doubler is faster, safer and easier to document. If your specification is vague, contractors will fill the gaps with their cheapest assumption, and you will pay for that assumption later.

Stage 2: Capability Screen

• Comparable references — same depth band, same weld class, same material, same asset type. A shallow topside specialist is not a hyperbaric contractor.
• Vessel access — owned, chartered or “we can get one.” The third answer is a schedule risk, not a capability.
• In-house versus subcontracted diving — either is legitimate, but you need to know who actually holds the dive plan and the liability.
• Welder qualification validity — current, in date, and matched to position, class and material.
• Independent NDT — verification separate from the welding contractor is a standard control on classified assets, and it removes the obvious conflict of interest.
• Welding engineer on staff — not a consultant who appears at kickoff and vanishes at the first NDT failure.

Stage 3: Documentation Review

Ask for the paperwork before you ask for a price. A legitimate contractor will send it without a fight: approved WPS and supporting PQR, welder certificates with expiry dates, equipment calibration records, NDT procedures and technician certifications, insurance certificates, and dive plans aligned with OSHA 1910.424 and, where applicable, AWS D3.6M qualification requirements.

HSE statistics need defusing before they mean anything. Recordable, lost-time and near-miss rates are only comparable when both sides use the same definitions and the same exposure hours. Ask for the definitions in writing.

Stage 4: Commercial Terms

Lump sum transfers productivity risk to the contractor, who will price contingency into it. Day rates leave productivity risk with you. Schedules of rates sit in between and are the easiest to audit line by line. Whatever the structure, nail down weather downtime provisions, standby rates, mobilization and demobilization costs, and the mechanics of change orders. On most offshore campaigns, weather and standby provisions dominate commercial risk far more than welding labor does. A crew sitting on standby in a weather window costs nearly what a crew welding costs.

Stage 5: Pre-Mobilization

The last stage happens before anything leaves the dock. Hold a procedure review meeting with the welding engineer, superintendent and client inspector in the same room. Then insist on a mock-up or trial weld on a representative test piece. This is a common risk-reduction step for critical offshore repairs, and it exposes fit-up, access and parameter problems while they are still cheap to fix. Agree hold points, third-party verification scope and concession routes in writing. For process-level background on marine work, see AJ Marine Welding: Processes, Standards, Safety and Best Practices.

Short Note: ADCI and IMCA membership, plus a willingness to share audit findings, are useful signals of a mature diving organization — but they are supporting evidence, not substitutes for the documents in Stage 3.

The through-line is simple: scope first, capability second, paper third, money fourth, trial last. Contractors who resist that order are telling you something important about how they will behave once the vessel is on hire and the weather is turning.

Cost, Contracts, and Schedules: Where the Money Actually Goes

Nobody publishes a price list for offshore welding. A contractor who hands you a clean per-weld number in the first meeting is either quoting a scope they have not fully read or pricing a risk they do not intend to carry. The honest answer to “what will this cost?” is that you are not buying welding: you are buying vessel time, chamber time, engineering, verification, and a weather window.

The Cost Drivers That Actually Move the Number

Vessel and spread day rates dominate everything. A saturation spread carries substantially higher day rates than a surface-oriented diving spread because it drags along a larger vessel, a deck decompression chamber complex, bells, gas storage, and a much bigger crew on rotation. That fixed cost runs whether a diver is in the water or the swell has shut operations down. Depth compounds it: deeper work means longer decompression, more gas, tighter limits, and shorter productive bottom time per shift.

Then come the quieter multipliers: water temperature and visibility that slow every task, welding class that dictates method and NDT extent, engineering and procedure development, third-party verification, mobilization distance, permits, and the season you chose. A Class A hyperbaric procedure with full NDT is not a slightly more expensive wet patch; it is a different project. Topside work such as structural repairs on aluminum superstructures brings its own consumable and procedure nuances, which is why AJ Marine Welding: Processes, Standards, Safety and Best Practices is worth reading before assuming one yard can handle steel and aluminum with the same crew.

Why Three Quotes for the Same Scope Differ by Multiples

Contract exclusions and assumed methods, not hourly welding rates, are the most common reason competing quotes diverge. One bidder assumed wet welding at a temporary class; another priced a habitat and a permanent repair. One included NDT; two excluded it and would bill it as a variation. One included weather standby; another assumed calm seas for the whole window. One holds a vessel under charter and can mobilize in days; another must source one and has priced the scarcity in. Line the quotes up item by item and the four-fold spread usually resolves into method, exclusion, and risk.

Contract Structures and Who Carries the Risk

• Day rate: the client carries productivity risk. Cheap when work goes well, brutal when it does not. Needs strong supervision and clear daily reporting.
• Lump sum: the contractor carries it and prices contingency in. Good for well-surveyed scopes; dangerous when the defect is only partly characterized.
• Schedule of rates: unit prices per weld, per anode, per meter. Works for repetitive campaigns only if units and method assumptions are pinned down in writing.
• Target cost with gain-share: both sides share upside and downside, rewarding planning over variation-finding.

Whatever the structure, read the standby rates, mob and demob terms, and change-order mechanics before signing. Mob and demob can consume a significant share of total campaign cost on short scopes, which is why batching repairs into one spread beats five separate callouts. Fixed completion dates shift weather risk onto the contractor, who will price it in. Every offshore operation also sits inside a regulatory frame: OSHA’s commercial diving requirements and IMCA’s diving guidance both shape what a compliant spread must carry, and compliance carries cost.

An Illustrative Cost Structure (Planning Heuristic, Not a Quote)

Treat those bands as a way to sanity-check a bid, never as a price. If a quote shows mobilization at 3% on a two-week scope, ask what was left out.

Budgeting Contingency and Avoiding the Cheap-Trap

Carry contingency for two things: weather and discovery. Weather standby is not an unlikely extra; it is a scheduled feature of offshore work. Discovery, meaning a second crack, worse corrosion, or a member that will not take the planned weld, is equally normal. Ten to twenty percent is a reasonable starting point for a well-surveyed scope, more when inspection data is thin. Schedules should also list the standby rate explicitly, because a cheap day rate with an expensive weather clause only looks cheap.

Finally, cheapest-per-weld is frequently the most expensive per-asset outcome. A low bid that buys a temporary repair, skips NDT, or pushes a weld class down the ladder hands you a re-repair, a lost production window, and a documentation gap an auditor will find. Price the asset life, not the arc time.

Common Mistakes, Failure Modes, and Practical Troubleshooting

Most offshore weld failures don’t begin at the arc. They begin in a document: a hurried specification, a certificate nobody date-checked, a verbal change that moved scope without moving paperwork. The arc just finishes the job. Treat this as a pre-mobilization review or a post-failure autopsy.

Specification Mistakes

• Wrong weld class. “Good underwater welds” is not a specification. AWS D3.6 weld classes set quality requirements, inspection extent, and acceptance criteria, and several can be met by more than one method. Pick the class from criticality, not the quote.
• Missing acceptance criteria. If the spec never defines rejection, the contractor’s own procedure becomes the de facto standard. That isn’t a standard.
• WPS used outside its qualified range. A procedure qualified at 30 m in still water on 12 mm plate does not cover 90 m, another steel grade, another position, or an unseen repair groove. Qualification range is a boundary, not a suggestion.
• Temporary repairs treated as permanent. Wet weld repairs are often accepted as interim. Five years on, nobody remembers the caveat and the clamp is still there. Mark them physically and in the asset register.

Contractor Mistakes

These surface in a third-party audit, or three years later in a fatigue assessment.

• Uncalibrated equipment. Power sources, gas analyzers, and NDT instruments drift. Records with valid dates are non-negotiable.
• Expired welder certificates. Diver-welder qualifications to AWS D3.6M or ISO 15618 carry validity periods and limits on position, class, and material. Check the certificate, not the CV.
• Inadequate gas monitoring. Oxygen and combustible gas monitoring in a habitat is life safety, not formality. OSHA’s commercial diving rules under 29 CFR 1910 Subpart T and the welding provisions at 1910.424 exist because this gets skipped under schedule pressure.
• Poor fit-up. Excessive gap, misalignment, or an undressed root face forces the welder to compensate with more heat and more metal. Both raise cracking risk.
• Welding wet surfaces. At the margins this is nearly unavoidable underwater, which is why the procedure specifies surface prep and the diver-welder must be allowed to stop and re-prep.
• Skipping preheat or post-weld controls. The procedure either specifies them or justifies their exclusion in engineering terms, not for convenience.

Client Mistakes

• Late NDT. Inspection after demobilization turns a quality issue into a logistics crisis.
• Unclear hold points. If nobody agreed in writing where work stops, work doesn’t stop.
• No independent verification. A contractor inspecting its own welds is a conflict of interest, not a conspiracy. Use separate NDT.
• Pressure to skip qualification. “We’ve done this before” is experience; a PQR is evidence.
• Undocumented verbal changes. The most expensive sentence offshore is “just go ahead and do it.”

Metallurgical and Quality Failure Modes

Hydrogen-assisted cracking is the headline risk in wet welding. Rapid cooling in water plus hydrogen picked up in the weld zone creates a hard, crack-susceptible microstructure, and cracks often appear hours or days after the diver surfaces, long after inspection passed.

Lack of fusion and porosity are the two discontinuities underwater NDT finds most often on repair welds. Both trace to access, visibility, surface condition, and technique under bad positioning. Neither is exotic, so the inspection plan should assume them.

Others worth naming:

• Undercut reduces section at the toe, a fatigue initiation site.
• Arc strikes leave untempered martensite outside the weld. On sour or high-strength steel, one stray arc can be a rejection item.
• Hardness excursions pass visual and some NDT, then fail survey limits.
• Coating damage and corrosion is the quiet killer. Coating or CP damage around a finished weld builds a corrosion cell that undermines a sound repair. Budget coating and anode restoration into the same scope, not a later campaign.

For a deeper process-level look, see our guides on marine welding standards and practice and alloy steel electrode selection.

Practical Troubleshooting

When NDT fails: don’t grind first and think later. Map the indication against the acceptance criteria for the specified class. A rounded porosity cluster and a planar lack-of-fusion indication demand completely different responses.

Repair or cut out: a discontinuity within fitness-for-service limits can sometimes be accepted, but only through documented evaluation by a qualified party. Anything planar, transverse to principal stress, or in a fatigue-sensitive detail argues for cut-out and reweld.

When to switch from wet to habitat: if the joint is Class A, the steel is crack-sensitive, depth is pushing the practical limit, or the first wet attempt failed NDT for hydrogen-related reasons, stop. Habitat welding costs more per weld and less per failure.

The through-line is unglamorous: write the class down, verify the paperwork, inspect independently, log every deviation. Everything else is recoverable. Documentation failures come back years later with interest.

The Future of Offshore Welding Companies — and Key Takeaways

Whether you are buying welding services, building a career in them, or approving the invoices, it helps to know which way the market is moving. The direction of travel is clear: more work, more documentation, and less tolerance for contractors who cannot prove what they claim.

Six Trends Reshaping the Sector

• Decommissioning is becoming a steady workload. Aging offshore oil and gas infrastructure is being retired in volume, and the decommissioning of offshore facilities is a multi-year, multi-billion-dollar global activity. All of it generates sustained cutting, welding, and structural scope: platform removals, conductor severance, pile cutting, and temporary sea-fastening.
• Offshore wind is widening the addressable market. Monopiles, transition pieces, and jacket foundations need repair and retrofit work that oil and gas contractors are well placed to deliver. The welding challenges differ: thicker sections, different fatigue regimes, tighter coating interfaces, and support vessels like the aluminum-hulled crew transfer fleet that keep the site running.
• Remote and unmanned intervention is growing. ROV-deployed tooling, digital twins, and remote inspection reduce the number of people exposed offshore. It does not remove welders, but it shifts the skill mix toward technicians who can interpret data and verify work remotely.
• Digital traceability is becoming an expectation. Asset owners and classification societies increasingly want weld procedures, qualifications, and inspection results captured digitally rather than in a scanned folder. A contractor whose records live in one searchable system is easier to audit and easier to trust.
• Wet welding consumables keep improving. Better electrodes and tighter process control are broadening the realistic envelope for wet welds, though they have not eliminated the hydrogen-cracking trade-offs that still push critical joints into habitats.
• Competency scrutiny is tightening. Operators, insurers, and bodies such as IMCA are asking harder questions about who actually performed the weld, on what procedure, and under whose supervision.

What This Means for Careers

The people who will thrive are not simply good welders or good divers. The core differentiator is dual competency: a commercial diving qualification, a weld procedure qualification tied to the code you work under, and the documentation discipline to prove both. Add NDT literacy or welding engineering and you move from technician to the person clients want on the call.

If you are planning the training route, treat it as a multi-year build rather than a single course. An aluminium welding course or a diving certification is one brick, not the wall. The underwater welder career path is real and rewarding, but it rewards people who can read a WPS as comfortably as they read a dive table.

Ten Things to Remember

1. Define the weld class and acceptance criteria before you shop for a contractor.
2. An offshore welding company is a project-management and logistics business as much as a welding one.
3. Wet, habitat, and dry hyperbaric welding are not interchangeable; criticality picks the method.
4. A certificate is a claim about a specific test on a specific day. Verify scope, position, class, and material match.
5. Mobilization, not welding speed, is usually the real bottleneck.
6. Ask for WPS, PQR, welder qualifications with expiry dates, and calibration records, then read them.
7. References should include the repair that went wrong and how it was handled.
8. Day rate and lump sum carry very different risk allocations. Know which one you are buying.
9. Weather windows and planned campaigns beat emergency callouts on cost per weld, every time.
10. The cheapest quote is a hypothesis, not a price.

Put simply: an offshore welding company is a specialized contractor that performs welding, burning, and structural repair on offshore energy infrastructure, using diver-welders in wet or hyperbaric conditions or topside welders on deck and in yards. The client still owns the specification, the code selection, and the acceptance decision. Choose a contractor who can mobilize a real spread, document the work to a standard that survives audit, and tell you when the procedure is wrong.

Frequently Asked Questions

What is an offshore welding company?

It is a specialized contractor that performs welding, burning, and structural repair on offshore infrastructure such as platforms, pipelines, FPSOs, and wind foundations. Most combine commercial diving capability with welding engineering, NDT, and marine logistics. Some also operate fabrication yards that support offshore installation.

Are offshore welding companies the same as underwater welding companies?

Not exactly. Underwater welding is one service line. An offshore welding company may also do topside welding, habitat welding, pipeline tie-ins, and fabrication support, and may subcontract the diving portion. Always confirm whether the diving capability is in-house or brokered.

What is AWS D3.6 and why does it matter when hiring a contractor?

AWS D3.6M is the Underwater Welding Code, covering qualification requirements, inspection criteria, and acceptance standards for wet and dry hyperbaric welding. It gives you a shared language for weld class and acceptance. Ask any contractor to show that their procedure and welders are qualified to the class your asset requires.

Is wet welding allowed for permanent offshore repairs?

Sometimes, but it depends on criticality, the required weld class, and the applicable code and client specification. Wet welding is more prone to hydrogen cracking and reduced ductility, so it is often restricted to non-critical, temporary, or specifically qualified applications. Critical structural repairs more often call for habitat or dry hyperbaric welding.

How much do offshore welding services cost?

There is no meaningful single number. Cost is driven by vessel and spread day rates, depth, method, weld class, NDT scope, mobilization distance, season, and contract structure. Short emergency scopes can cost several times more per weld than planned campaign work because mobilization is not spread across many joints.

What documents should I request from an offshore welding contractor?

At minimum: welding procedure specifications and their qualification records, current welder qualification certificates, equipment calibration records, NDT procedures and technician certifications, dive plans and risk assessments, insurance certificates, and HSE incident data with defined terms. For classed assets, add classification society approvals.

How long does it take to mobilize an offshore welding spread?

It varies widely with vessel availability, location, and permitting. Planned campaigns are typically scheduled weeks to months ahead, while emergency callouts rely on spot vessel availability and can be constrained by weather. Realistic clients plan the weather window before they plan the weld.

Do offshore welding companies handle inspection too?

Many offer NDT as part of the package, but for critical work clients often insist on independent inspection to avoid a contractor grading its own work. Clarify in the contract who performs NDT, to which procedure, and who holds acceptance authority.

Is offshore welding a good career in 2026?

It can be lucrative but it is physically demanding, weather-dependent, and requires dual competency in commercial diving and welding plus strong documentation habits. Demand is sustained by aging infrastructure, decommissioning, and offshore wind, but entry requires formal dive training and welder qualification, not just welding skill.

What is the biggest mistake buyers make when selecting an offshore welding company?

Shopping on price before defining the weld class, acceptance criteria, and inspection scope. Without that specification, quotes are not comparable, and the lowest number often reflects a cheaper method, narrower scope, or unstated exclusions rather than better value.