Dupill Group certified welder at work
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Specialty Welding

Specialty welding, field machining, and heat treating for boilers, pressure vessels, and piping — across nuclear, power generation, pipeline, petrochemical, and industrial markets.

NBIC "R" Stamp certified

We don't just weld.

We restore confidence in your critical equipment. As an NBIC "R" Stamp certified repair organization, we deliver expert welding, repairs, and alterations for boilers, pressure vessels, and piping that meet the industry's most rigorous safety and quality standards — precision workmanship with rapid turnaround to keep your operations running.

NBIC "R" StampASME NQA-1Nuclear · Fossil · Industrial
Dupill Group welder on a large-component field weld
Welded, repaired & altered to code · In the shop & in the field
Certified welding on a critical component
Welding & piping

Proven expertise.

Process piping, piping-component fabrication, and field installation — built to spec and to code. Hover any term for a plain-English definition.

Automated / Orbital Welding iA mechanized process where the welding arc travels a full 360° around a fixed pipe or tube, producing uniform, repeatable, high-purity welds — ideal for critical and high-purity piping. Tip Tig — P91 iTip Tig is an advanced hot-wire TIG process for faster, higher-quality welds. P91 is a creep-strength-enhanced alloy steel used in high-temperature, high-pressure power piping. High-Purity P-8 iP-8 covers austenitic stainless steels (ASME grouping). High-purity welding keeps the weld interior contamination-free — critical for pharma, semiconductor, and nuclear fluid systems. Done automated, autogenous (no filler), or manual. GTAW · SMAW · GMAW · FCAW iThe four core arc-welding processes: GTAW (TIG), SMAW (stick), GMAW (MIG), and FCAW (flux-cored) — each suited to different metals, positions, and code requirements. Valve Seat Replacements — Gate · Globe · Check iCutting out and welding in a new sealing seat when the original is beyond repair — on gate, globe, and check valves. Closure Welds iThe final weld that seals a component or system closed — often the most inspected weld on the job, made under strict quality hold points. Exotic Materials iHigh-alloy and specialty metals — such as Inconel, titanium, and duplex stainless — that require specialized, qualified welding procedures. Boilers & Pressure Vessels
Beyond the arc

Field machining, heat treating & more

Machining

Field Machining

Pipe beveling, pipe cutting, milling & drilling, flange facing, and valve ID repair — on site, in the field.

Heat Treating

Pre & Post-Weld Heat Treating

Pre- and post-weld heat treating through induction or resistance methods — stress relieving, normalizing, tempering, and precipitation hardening.

Mechanical

Specialty Mechanical

Technical bolting and tensioning, isolation test plugs, and hot taps / line stops / isolation bag stops — plus staff augmentation for your outage. On-site repairs, modifications, and improvements.

"R"
NBIC stamp certified
4
Arc processes
P91 · P-8
Specialty alloys
24/7
Rapid turnaround

Restore confidence in your equipment.

Boilers, pressure vessels, piping — welded, repaired, and altered to code. Tell us about your project.

We'll get back to you within 24 hours