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Specialty Welding

Code-qualified field and shop welding for structural steel, pressure piping, vessels, and industrial equipment — including exotic alloys, weld overlay, heat treatment, and repairs in refineries, power plants, and other facilities where weld quality is critical. Find specialty welding contractors near you and connect with local providers through Scaffold Exchange.

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What Is Specialty Welding?

Definition: Specialty welding is welding performed to engineering codes and specifications on critical components — such as pressure piping, boilers, vessels, structural steel, and pipelines — or with specialized materials and processes. It is carried out by welders qualified under written welding procedures for the specific process, material, and position, and is typically inspected and tested to verify the weld meets the code's requirements.

A weld on a high-pressure steam line, refinery piping, or a structural connection carries real consequences if it fails. That is why critical welding is governed by codes such as ASME for boilers, pressure vessels, and piping, AWS D1.1 for structural steel, and API 1104 for pipelines. Specialty welding contractors develop qualified welding procedures, qualify their welders to those procedures, control materials and filler metals, and document each weld for inspection.

Specialty welding also covers difficult materials and techniques — stainless steels, chrome-moly, nickel alloys, and other exotic metals; weld overlay and hardfacing to protect against corrosion and wear; orbital welding; and pre-heat and post-weld heat treatment. Much of this work happens in the field during shutdowns and outages, often at height on pipe racks, boilers, and structures, using scaffolding for safe, stable access. Through Scaffold Exchange, you can find specialty welding contractors across the U.S. and compare their capabilities and availability.

What Specialty Welding Services Include

Service offerings vary by contractor, but most specialty welding firms provide the following capabilities.

Piping

Code Pipe & Pressure Welding

Welding of process piping, boiler tubes, and pressure components to applicable codes with qualified procedures and welders.

Structural

Structural Steel Welding

Field and shop welding of beams, columns, connections, and repairs to structural welding codes and project specifications.

Alloys

Exotic & Alloy Welding

Welding of stainless steels, chrome-moly, duplex, nickel alloys, and other specialty metals requiring precise control.

Protection

Weld Overlay & Hardfacing

Corrosion-resistant overlay and wear-resistant hardfacing applied to boiler tubes, vessels, and equipment to extend service life.

Quality

Heat Treatment & Testing

Pre-heat, post-weld heat treatment, and coordination of non-destructive testing to verify weld quality and code compliance.

Common Applications & Facilities

Specialty welding is performed across energy, industrial, and infrastructure facilities throughout the United States.

Refinery and petrochemical turnarounds

Power plant boiler tube repair and replacement

Pressure vessel and heat exchanger repair

Process piping fabrication and installation

Structural steel erection and retrofit

Pipeline construction and repair

Pharmaceutical and food-grade stainless piping

Mining, pulp and paper, and heavy industry equipment

Specialty welding often works alongside other industrial specialty services. Here is how it compares and which situations each suits best.

Refractory

Heat-resistant linings

  • Lines furnaces, boilers, and heaters
  • Requires welded anchors on the shell
  • Often scheduled with welding in outages
  • Best for high-temperature equipment
Industrial Linings

Interior protection for tanks and vessels

  • Polymer and rubber lining systems
  • Applied after weld repairs are complete
  • Chemical and corrosion resistance
  • Best for tanks, vessels, and containment
Specialty Welding ← You are here

Code-qualified critical welding

  • Pressure piping, vessels, and structural steel
  • Exotic alloys, overlay, and hardfacing
  • Qualified procedures, welders, and testing
  • Best for critical repairs and installations
Corrosion Under Insulation (CUI)

Finding and stopping hidden corrosion

  • Finds wall loss on insulated equipment
  • May lead to weld repairs or replacement
  • Coatings and reinsulation after repair
  • Best for refinery and plant integrity programs
General Skilled Labor Services

Skilled trade labor support

  • Flexible crews for many tasks
  • Fit-up, rigging, and helper support
  • Scaled to project needs
  • Best for general construction support

Find Specialty Welding Contractors Near You

Use the Scaffold Exchange map to search by location, filter by service type, and connect directly with local contractors that provide code-qualified and specialty welding.

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OSHA Compliance & Safety Standards

Welding is regulated by OSHA standard 29 CFR 1910.252, which sets general requirements for welding, cutting, and brazing, including fire prevention, hot work authorization, and protection of personnel, with construction requirements in 29 CFR 1926 Subpart J. Welding in plants typically requires hot work permits, fire watches, and atmospheric testing, and welding fumes from stainless steel and other alloys may require additional exposure controls. Welding at height must be performed from scaffolds that meet OSHA requirements.

  • Hot work permits issued before welding in facilities
  • Combustibles removed or protected, with a fire watch posted
  • Atmospheric testing where flammable vapors may be present
  • Ventilation and respiratory protection for welding fumes
  • Eye, face, and skin protection for welders and nearby workers
  • Scaffold planks and netting protected from sparks and heat
OSHA Standard 29 CFR
1910.252

Welding, Cutting, and Brazing — General Requirements — U.S. General Industry Regulations

OSHA Interpretations & Rulings →

Frequently Asked Questions

Specialty welding is welding performed to engineering codes on critical components — such as pressure piping, vessels, boilers, pipelines, and structural steel — or with specialized materials and processes. It uses qualified procedures and welders and is inspected and tested to verify quality.
Common codes include ASME for boilers, pressure vessels, and pressure piping, AWS D1.1 for structural steel, and API 1104 for pipelines. Project specifications identify which codes apply, and welding procedures and welder qualifications must meet those codes.
Post-weld heat treatment heats a welded area to a specified temperature and holds it there for a set time before controlled cooling. It reduces residual stresses and improves the properties of the weld and surrounding metal, and is required by code for certain materials and thicknesses.
Use the Scaffold Exchange vendor map to search by your location and filter by service type. You can see which local contractors provide code-qualified and specialty welding, compare their capabilities, and contact them directly through the platform.
OSHA 29 CFR 1910.252 covers general welding, cutting, and brazing requirements, including fire prevention and hot work, and construction welding falls under 29 CFR 1926 Subpart J. Fume exposure, PPE, and scaffold standards also apply. Visit the OSHA website for full interpretations and rulings.
Yes, and it often is during outages and on structures. Scaffolds used for welding must meet OSHA requirements, and wood planks, netting, and wraps must be protected from sparks and heat with fire-resistant blankets or shields. A fire watch should cover the area below the work.

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