Industrial Welding Services: Field, Shop, Turnaround and Maintenance Welding

Industrial welding services are the qualified, code-governed joining and repair of steel, stainless steel and aluminum in plants and commercial facilities, and Paul Industries performs them in the shop and in the field, in all 50 states, with same-day emergency response. We weld pipe, structural steel, tanks, vessels, equipment frames and supports, on planned outages and on breakdowns, and each job closes with inspection records an auditor or the next engineer can read. This page is written for the plant engineer, facility manager or general contractor about to award that work: what it involves, which code applies, how downtime is handled, what paperwork arrives at the end and what it costs.

What is industrial welding?

Industrial welding is the joining or repair of metal in a plant, mill, refinery, utility or large commercial building, carried out under a written procedure by a welder qualified to that procedure and accepted against a named code. What separates it from general fabrication is the evidence behind each joint. A failed weld in this setting can release steam or product or drop a suspended load, so the code decides the filler metal, the heat input range, who may strike an arc and how the finished joint is examined. Jobs range from one cracked pump base to thousands of pipe joints in a single outage.

Commercial welding services apply the same discipline to hospitals, campuses, warehouses and high-rise buildings: stair and rail repairs, lintels and dunnage, loading dock steel, rooftop equipment frames, and chilled water or steam piping under ASME B31.9. Occupied space changes the planning more than the metallurgy, because fume, sparks and noise have to stay away from tenants and detection systems.

What do industrial welding services include?

Industrial welding services cover on-site repair, planned outage work, ongoing plant maintenance, structural steel, code piping and shop fabrication, and each of those carries its own governing code and record set.

Contract welding services and on-call work

Contract welding services deliver welding on your site under one agreement, with machines, consumables and supervision included, priced by the shift, by the unit or as a fixed job. Paul Industries runs them for a single week of repairs, for a full outage, or as a standing arrangement under our service contracts, where agreed rates and pre-approved procedures shorten the path from work order to first arc.

On site welding services vs shop welding

On site welding services bring the welder, machine and consumables to equipment that cannot move, while shop welding brings the part to a bench where position, gas coverage and inspection are easier to control. Paul Industries does both and splits the joints at the estimate stage, so everything that can be welded ahead of time arrives ready to fit. Our pipe fabrication page covers that shop side for piping. The table below is about what changes once the arc is struck in the plant itself.

Field welding services in an operating building

Field welding services inside an occupied building or running plant add fume, smoke and fire detection to the plan. We capture fume at the arc, agree with the owner which detectors are isolated and for how long, and restore them before leaving the area. Paul Industries also runs the temporary weld power and, through our commercial electrical services, adds a permanent weld receptacle where repeat work makes one worthwhile.

Which welding process fits the job?

Welding process selection depends on material, thickness, position, wind exposure and the inspection the joint must pass, and a single joint often uses two processes, such as a GTAW root with an SMAW fill.

Under AWS D1.1, SMAW, FCAW, submerged arc and spray or pulsed GMAW can run on prequalified procedures, which saves test time when the joint fits the code’s limits. ASME work is qualified by testing or by a standard welding procedure specification. For repetitive high-purity joints, see our orbital welding services.

Stainless steel welding services, carbon steel and aluminum

Base metal sets the filler, the preheat and the main failure risk, so stainless, carbon steel and aluminum are planned as three different jobs.

Stainless. Stainless steel welding services center on heat control and on protecting the back of the joint from oxidation with an argon purge, usually with low-carbon grades such as 304L and 316L and matching filler. Fume needs its own plan: OSHA 29 CFR 1910.1026 limits hexavalent chromium to 5 micrograms per cubic meter over eight hours, with an action level of 2.5, so we extract at the arc and monitor exposure in tight spaces. Hygienic lines are covered on our sanitary welding page, and technique on our guide to how to weld stainless steel.

Carbon steel. The main risk is hydrogen cracking in the hardened zone beside the weld, and it grows with thickness, restraint and carbon content. Low-hydrogen consumables, dry joints and code-table preheat keep it under control, and heavy-wall pressure work can need postweld heat treatment with a recorded time and temperature chart.

Aluminum. Oxide has to be removed right before welding, and the heat softens tempered alloys. A 6061-T6 member at about 40 ksi tensile strength is held to a 24 ksi minimum in the as-welded condition under AWS D1.2, and that loss stays unless the part is heat treated again. A repair in the field therefore often adds section or a doubler rather than simply closing a crack.

Which welding codes apply to industrial work?

Welding code selection follows the product being welded: structural steel generally falls under AWS D1.1, pressure piping under an ASME B31 book, and pressure equipment under the ASME Boiler and Pressure Vessel Code, with Section IX supplying qualification rules for the ASME work.

A plant specification can go beyond any of these, so we read it before selecting a procedure and flag conflicts in writing at the estimate stage.

What paperwork comes with industrial welding?

Industrial welding paperwork proves who welded each joint, to which approved procedure, with what material, and whether the joint passed examination.

On a small repair this can be two pages. On an outage it becomes an indexed turnover package, delivered with the system rather than weeks after restart.

Weld inspection and NDE methods

Weld inspection ranges from visual examination of every completed joint to volumetric testing of a defined sample, and the code, fluid service or contract decides how much applies.

Under ASME B31.3, Normal Fluid Service sets a floor of 5 percent random radiographic or ultrasonic examination on circumferential butt welds, and Category M service asks for considerably more. AWS D1.1 starts with visual inspection of all welds and leaves further testing mainly to the contract documents, so a structural specification should say which joints get UT. We schedule NDE alongside welding so a rejected joint gets repaired inside the same window.

Hot work permits and welding in a running plant

A hot work permit is the written authorization that an area has been inspected, that fire precautions are in place, and that welding may proceed on a named object on stated dates. OSHA 29 CFR 1910.252 requires the responsible person to inspect the area first and calls for combustibles to be moved at least 35 feet away where practicable. Plants covered by process safety management must issue the permit under 29 CFR 1910.119(k). A fire watch stays for at least a half hour after the work under OSHA, and NFPA 51B has set one hour since its 2019 edition, so we work to the longer requirement that applies at the site.

Gas testing comes next on any line or vessel that has held flammable product, since 29 CFR 1910.146 treats flammable gas above 10 percent of its lower flammable limit as a hazardous atmosphere in a permit space, and oxygen outside 19.5 to 23.5 percent likewise. Argon purge gas matters here too, because it displaces oxygen in enclosed rooms and vessels. Isolation follows the plant’s lockout procedures under 29 CFR 1910.147.

Keeping production running is mostly a matter of moving hours away from the live area. We prefabricate offline, install valved connections during one short stop for use later, weld on isolated branches while the main header stays live, and plan containment so sparks cannot reach product or oil-soaked insulation. Where a connection truly cannot wait for a stop, in-service welding or a hot tap under API RP 2201 runs to a written, job-specific procedure after an ultrasonic wall check.

Turnaround welding services and shutdown planning

Turnaround welding services are welds planned weeks or months ahead and made inside a fixed outage, when isolated equipment can be opened and lines can be cut. Weld count and inch count drive crew size, so the estimate begins with a walkdown, not a headcount. The wider outage scope sits on our shutdown and turnaround services page; here is the welding sequence inside it.

Discovery work is the variable that wrecks a plan, such as a nozzle found thinner than expected once the vessel is open. An agreed unit rate and contingency hours cover it, and the outage plan carries approved procedures for every alloy in that unit.

Industrial maintenance welding between outages

Industrial maintenance welding keeps plant equipment in service through planned repairs, wear restoration and small modifications made between major outages. Typical work includes chutes, hoppers, conveyor frames, fan housings, pump bases, pipe supports and platforms, along with hardfacing on surfaces worn by abrasive product. Scheduling it against production stops, and recording each repair by asset number, turns one-off fixes into a usable history of what keeps failing. Paul Industries builds that into its industrial maintenance services, and a breakdown goes to our emergency repair service, with same-day response in all 50 states. Heat burns the coating on both sides of a repair, so the repair area needs recoating before it goes back into service.

Industrial welding and repair: weld it or replace it?

Industrial welding and repair decisions weigh remaining wall and material condition, the cause of the damage, and the downtime each route costs.

Three references settle the harder cases: API 579-1/ASME FFS-1 for fitness for service, ASME PCC-2 for repair methods on pressure equipment and piping, and AWS D1.7 for strengthening and repairing existing structures. A weld alone fixes the symptom, so we look for the cause, whether resonance, misalignment, corrosion under insulation or overload, and report it with the repair.

Structural welding services for existing steel

Structural welding services join or reinforce beams, columns, platforms, pipe racks and equipment supports to AWS D1.1 or a related structural code, following a connection design from the engineer of record. New steel is the easy part. Reinforcing a member that is already carrying load needs engineering review, because heated steel temporarily loses strength, so the sequence may call for shoring or removing load before welding. Mill certificates are often missing on old buildings, and weldability of unknown steel gets checked before a procedure is chosen. New members and assemblies come from our structural steel fabrication work.

Pipe welding services for plant systems

Pipe welding services join carbon steel, stainless and alloy lines by butt, socket and branch welds under ASME B31.1, B31.3 or B31.9, depending on the service. Most plant work is tie-ins and replacements rather than new runs, which makes line clearing, drain-down and gas testing a real share of the hours. Our process piping page covers design and installation of complete systems. When a joint sits on an in-service line, flowing product pulls heat away quickly, which raises the hardness of the weld zone, so the procedure accounts for flow and wall thickness.

How much do industrial welding services cost?

Industrial welding services are priced by the hour, by the unit or as a fixed job, and published consumer cost guides list general welding labor at roughly $60 to $125 an hour, with field and plant work above that. Plant turnaround crews budget higher, at about $105 to $185 per person per hour depending on region and trade, with nights and weekends at 1.5 to 2 times. All of these are labor-only planning figures: materials, NDE, scaffold, equipment and engineering are extra, and a real budget comes from the scope.

What moves the number: alloy and wall thickness, joint count and position, NDE percentage, preheat and heat treatment, permit and fire watch time, night or weekend windows, confined space entry, scaffold, and the record package required. Paul Industries gives a budget range from comparable scope early on, then a firm price once drawings, photos or a walkdown define the job.

What to expect from an industrial welding contractor

An industrial welding contractor should put procedures that match the job, qualified welders, an inspection plan and an isolation plan in front of you before the first arc. Those four items reveal whether the material, thickness and position on your drawings were actually read. Choosing an industrial welding company on that evidence works better than comparing hourly rates, since a rejected joint late in an outage can quickly erase a small rate difference. With Paul Industries, welding, inspection, test, coating and records all sit under one contract and one schedule, so you have a single accountable name when the restart date is close.

Who provides industrial welding services nationwide?

Paul Industries provides industrial welding services nationwide, in the shop and in the field, in all 50 states, with same-day emergency response. Our service area covers every state, from pharmaceutical, food, data center and oil and gas plants to commercial buildings.

What Paul Industries welds, and how to start

Paul Industries welds carbon steel, stainless steel and aluminum pipe, structural steel, tanks, vessels, ducts and equipment, and supplies the design, material, fabrication, installation, inspection, testing, coating and maintenance around those welds. You can buy this three ways: supply-only fabricated assemblies shipped to your site, design-build where we engineer and build the connection or system, or complete installation through turnover. As your industrial mechanical contractor, we can take a single repair or a full plant shutdown under one contract. Send drawings or photos, material, thickness, the code or plant specification and your window through request a quote, and we will return a budget range, then a firm price once the scope is defined.

Standards referenced: AWS D1.1 · AWS D1.2 · AWS D1.3 · AWS D1.6 · AWS D1.7 · AWS D1.8 · ASME Section IX · ASME Section VIII · ASME B31.1 · ASME B31.3 · ASME B31.9 · ASME BPE · ASME PCC-2 · API 510 · API 570 · API 653 · API 1104 · API RP 2201 · API 579-1/ASME FFS-1 · National Board Inspection Code · NFPA 51B · OSHA 29 CFR 1910.119 · OSHA 29 CFR 1910.146 · OSHA 29 CFR 1910.147 · OSHA 29 CFR 1910.252 · OSHA 29 CFR 1910.1026

Frequently asked questions

What is commercial welding?

Commercial welding is code-governed metal joining and repair for buildings and businesses rather than process plants. Stair and rail repair, rooftop frames, lintels and heating or cooling piping are typical examples, and schedule, tenants and fire protection usually shape the job as much as the joint itself.

Is industrial welding dangerous, and how is the risk controlled?

Industrial welding carries real hazards: metal fume, ultraviolet radiation, electric shock, burns, fire, and oxygen displacement in enclosed spaces. Permits, extraction, arc and respiratory protection, insulated leads, atmospheric testing and a fire watch keep those risks controlled, and a running plant adds process hazards such as residual product in lines.

Who performs turnaround welding for refineries and chemical plants?

Paul Industries performs turnaround welding for refineries, chemical plants and other process facilities in all 50 states. At sites under OSHA process safety management, a contract employer must train its people in the process hazards and the facility's safety rules and keep a record of that training, and we build that into the outage plan.

Who repairs cracked equipment frames and machinery bases on site?

Paul Industries repairs them in place. We locate the crack ends with dye penetrant or magnetic particle testing, gouge out the full length, weld under a qualified procedure, and add a stiffener or gusset where vibration or overload caused the crack, then check alignment on any machine that was disturbed.

How quickly can a welder respond to a plant breakdown?

Paul Industries offers same-day emergency response in all 50 states. A photo of the damage, the material and thickness if known, what the line carried, and whether it is isolated lets us have the right procedure, filler and equipment on the first shift.

Can welding be done without stopping production?

Often, yes. Supports, platforms and equipment outside the process boundary can usually be welded with production running, given containment and a permit. Branches that can be valved off are worked on while the header stays live, and a connection welded in at one short stop can serve later tie-ins with no further outage.

Can a pipe be welded while it is still in service?

Yes, under a written procedure, and with extra attention to two risks. Thin wall can burn through, and flowing product chills the joint fast enough to produce a hard, crack-prone zone. Wall thickness, flow and fluid are all reviewed, and some fluids rule out the method for that line, so an isolated tie-in gets used there instead.

How long must a fire watch stay after welding ends?

OSHA requires at least a half hour. The 2019 edition of NFPA 51B sets one hour and lets the person authorizing the permit add monitoring for up to three more hours. The edition adopted locally and the site's own permit rules decide what applies, and those rules can be stricter than either.

Why would a plant want to review a welding procedure specification?

A review lets the plant engineer confirm that base metal, filler, preheat and code match the service before anything is cut. The specification is the set of working instructions for the joint, and its supporting qualification record shows test coupons built to those instructions passed.

How long does a welder's qualification stay valid?

Under ASME Section IX a performance qualification stays in effect while the welder keeps using that process, and it lapses after six months without doing so. It can also be revoked when there is a specific reason to question the person's ability, and AWS D1.1 applies a similar six-month activity test.

When does carbon steel need preheat before welding?

Preheat becomes necessary as thickness, carbon content and joint restraint rise, or when the steel is cold or damp. Minimum temperatures come from tables in AWS D1.1 and the piping codes, organized by steel grade and thickness. Slowing the cooling rate gives hydrogen time to escape and lowers the risk of cracking beside the weld.

Which welding process handles wind outdoors?

SMAW and self-shielded flux core make their shielding from the flux itself, so they tolerate moving air better than gas-shielded methods. GTAW, GMAW and gas-shielded flux core need a shelter that holds air movement near the arc to 5 mph or less under AWS D1.1.

Can aluminum be welded on site?

Yes, using AC GTAW or pulsed GMAW with dry, freshly brushed metal and stainless brushes kept for aluminum only. Common fillers for 6061 are 4043 and 5356, chosen for service conditions. Field conditions rule out re-heat-treating the part, so the design has to work at as-welded strength.

Can cast iron machinery be repaired by welding?

Often, using nickel-based filler with short beads and peening, or with controlled preheat on the whole casting, depending on its shape and service. Slow, even cooling matters because cast iron cracks easily under shrinkage stress. Bore and alignment checks follow the repair on any gear or pump housing.

Is a field weld as strong as a shop weld?

A field weld is held to the same code and acceptance criteria as a shop weld, and when it meets them it performs the same. Position, wind and access make those criteria harder to hit, which is why field joints get more preparation, shelter and in-process checks.

What do you need from us to price a welding job?

Useful inputs are drawings or photos, material and thickness, the governing code or plant specification, approximate joint count, location in the plant, permit rules, the required inspection level and the available window. A partial list is enough to produce a budget range from comparable scope.

Do repaired welds get inspected again?

Yes. A repaired joint is re-examined by the method that found the flaw, and under ASME B31.3 random sampling a reject also widens the sample to more of that welder's joints. Repairs to a pressure boundary normally go through the system's leak test as well.

Can welding be booked by the shift for a plant project?

Yes. Paul Industries takes welding work by the shift on a time and materials basis, with machines, consumables and supervision included and daily tickets signed by your representative. Site orientation and procedure approval are handled before the first shift so paid hours go into welding.

Does welding damage the paint or coating next to a joint?

Yes. Heat burns the coating on both faces of the steel, usually well past the visible weld. We strip it back before welding, then prepare the surface and apply a coating system that matches the original, including inside tanks and on galvanized steel, where a zinc-rich repair product restores protection.

How long does a weld repair take on site?

A small accessible crack can close within a single shift, and much of that time goes to permit, isolation, gas testing and fire watch rather than arc time. Heavy wall, preheat, heat treatment and radiography can stretch the same repair over several shifts, and we give the duration with the budget.

What is the difference between industrial and structural welding?

Industrial is the broad term for welding in plants, covering pipe, vessels, tanks, machinery and steel. Structural refers to load-carrying steel under a structural code such as AWS D1.1, so it sits inside industrial work in a plant while also applying to buildings and bridges.

Related: Sanitary Welding · Orbital Welding Services for Sanitary Pipe · Pipe Fabrication · Structural Steel Fabrication · Plant Shutdowns & Turnarounds · Pressure Vessel Fabrication · Request a quote