How do you prevent iron contamination on structural stainless projects?

By separation, not cleanup. Stainless structural work runs through our 40,000 sq ft stainless-only production space with dedicated tooling, handling equipment, and controlled raw material storage. No carbon steel enters that room. Iron particles embedded by shared grinding wheels or carbon fixtures compromise the passive layer and show up later as rust staining on a member that was specified precisely to avoid it.

What is your approach to controlling weld distortion in large stainless assemblies?

Proactive, not reactive. We minimize and balance heat input through qualified WPSs, plan weld sequences such as backstepping before the first arc strikes, and hold components in alignment with fixtures and strongbacks during welding and cooling. Our on-staff CWI oversees the process, and dimensional inspection confirms the result against your drawing.

Are your welding procedures compliant with AWS D1.6?

Yes. AWS D1.6 (Structural Welding Code, Stainless Steel) is the primary code for our stainless fabrication, and our welding procedures and personnel are qualified in accordance with AWS codes and ASME BPVC Section IX. Welder qualification records and WPS/PQR packages are available during the bid process.

When does duplex 2205 make sense for structural members?

When strength and corrosion resistance are both driving the design. Duplex 2205 carries roughly twice the yield strength of 316L, which can mean thinner sections and lighter members, and its chloride stress corrosion cracking resistance suits coastal structures, de-icing salt exposure, and process areas where austenitic grades are marginal. We will tell you when the duty does not justify the upgrade.

Can you fabricate Architecturally Exposed Structural Steel (AESS)?

Yes. AESS combines structural requirements with finish requirements: welds, grind marks, and forming impressions are all visible in the final installation. We fabricate AESS canopies, trusses, and columns where weld appearance and surface finish are controlled alongside dimensional tolerance, and our architectural stainless work includes large-scale public installations.

What tolerances do you hold on structural weldments?

Unless your drawing specifies otherwise, weldments are held to ISO 13920 general tolerances (Class B linear, Class F flatness), with precision Class A/E work quoted when the design requires it. Requirements tighter than Class A get an engineering review before we commit, so the quote reflects what the part actually needs.

Structural Stainless Steel Fabrication for Load-Bearing Applications

Stainless wants to move when you weld it and rust where carbon touches it. We fabricate structural stainless to AWS D1.6 with CWI-overseen distortion control and a stainless-only bay, so your members arrive spec-ready.

Northern Manufacturing fabricates structural stainless steel for load-bearing service: custom beams, columns, and trusses, pipe racks and equipment supports, access platforms, walkways, monumental staircases, and Architecturally Exposed Structural Steel (AESS). Weldments are built to AWS D1.6 (Structural Welding Code, Stainless Steel) by 60+ AWS-certified welders in our 160,000 sq ft indoor facility in Oak Harbor, Ohio, with stainless work segregated in a 40,000 sq ft stainless-only production space.

ISO 9001:2015 certified (AVU Registrations). Welding procedures and personnel qualified per AWS D1.6 and ASME BPVC Section IX, with a Certified Welding Inspector (CWI) on staff overseeing structural weld quality. In-house laser cutting, forming, rolling, and pickling/passivation keep the work start to finish under one roof and one quality system.

Why Structural Stainless Is Harder Than Carbon Steel

Specifying stainless for structural members is a lifecycle decision: corrosion resistance without coatings, decades of service in environments that eat painted carbon steel. But the same metallurgy that delivers that lifecycle makes the fabrication harder, and a shop that treats stainless like carbon steel builds the problems into your members.

Weld-induced distortion. Austenitic stainless has a coefficient of thermal expansion up to 50% higher than carbon steel and thermal conductivity roughly one-third as high. Weld heat stays trapped in a narrow zone, the metal expands hard, and the cooling contraction warps and bows members that started straight. On long structural welds, uncontrolled heat input turns a straight beam into a rejected one.

Work hardening. Austenitic grades harden significantly as they deform, which complicates forming, bending, and machining. Holding a bend angle or a machined surface takes more tonnage, sharper planning, and operators who know how the material behaves on the second hit, not just the first.

Operator forming a stainless steel bracket on a press brake at Northern Manufacturing

Cross-contamination. Iron particles from carbon steel tools or a shared workspace embed in the stainless surface, compromise the passive layer, and emerge as rust staining and localized pitting in service. On structural stainless the defect is not cosmetic: the member was specified for corrosion performance the contamination just took away.

How We Keep Weldments Dimensionally True

Distortion control at Northern is planned before the first arc strikes, not ground out afterward. Qualified WPSs limit and balance heat input. Weld sequences, including backstepping on long seams, distribute heat instead of concentrating it. Fixtures and strongbacks hold components in alignment through welding and cooling. Our on-staff CWI oversees the process from fit-up through final inspection, and dimensional inspection verifies every member against your drawing before it ships.

Unless your drawing specifies otherwise, weldments are held to ISO 13920 general tolerances (Class B linear, Class F flatness). Precision Class A/E work is available when the design requires it, and anything tighter than Class A gets an engineering review before we quote it.

What We Fabricate

Custom stainless beams, columns, and trusses. Laser-cut and welded profiles, including custom stainless beams in section sizes and geometries mills do not roll.
AESS elements. Canopies, trusses, and columns where weld appearance and surface finish are controlled alongside structural requirements. See our architectural stainless work.
Support structures for glass curtain walls and skylights. Tight field-alignment tolerances on members that stay visible for the life of the building.
Pipe racks and equipment supports. Corrosion-resistant racks and skid frames for process plants where painted carbon steel is a recurring maintenance cost.
Access platforms, walkways, and monumental staircases. Load-bearing fabrications for plant access and public spaces.
Structural components for bridges and infrastructure. Pedestrian bridges and coastal structures where de-icing salt and spray exposure rule out carbon steel.
Frames and supports for processing lines. Washdown-rated structural work for food and beverage and other sanitary environments.

Batch of identical stainless steel pipe manifold frame assemblies crated for shipment in the Northern Manufacturing laydown yard

Material Selection for Structural Service

Most structural stainless is 304L or 316L, with duplex 2205 earning its premium where strength or chlorides drive the design:

Grade	When to specify it
304L	General structural work in dry, sheltered, or low-chloride environments
316L	Washdown areas, coastal exposure, de-icing salts, and chemical process environments
Duplex 2205	Roughly twice the yield strength of 316L for thinner, lighter members; chloride SCC resistance

We stock 316/316L structural shapes (angle, tubing, pipe) with 5-day availability from our distributor network, and 316/316L plate from 20-gauge through 1 inch ships to us in 2 days. Duplex 2205 is sourced per project in sheet, plate, pipe, and tube, typically within three weeks.

Where Structural Stainless Earns Its Cost

Structural stainless pays for itself in environments where coating and replacing carbon steel is the alternative:

Water and wastewater. Pipe racks, access platforms, ladders, and supports for clarifiers and tanks that live above corrosive basins. See our water and wastewater fabrication.
Power, energy, and chemical. Equipment skids, pipe supports, and structures exposed to process chemicals and washdown. See our power, energy, and chemical work.
Pulp and paper. Platforms and supports in the most aggressive zones of the mill, where uptime depends on structure that does not corrode. See our pulp and paper fabrication.
Architecture, engineering, and construction. AESS and long-life infrastructure where the structure is also the finish.

Identical stainless steel cylindrical link assemblies with pin-eye end plates staged outdoors on wood cribbing

Quality Documentation

Every structural project ships with a documentation package assembled under our ISO 9001:2015 quality system:

Material Test Reports (MTRs) traced by heat number from mill cert to final assembly
Weld maps with WPS references for every joint, plus welder continuity logs
Dimensional inspection reports to your drawing tolerances
Pickling and passivation certification per ASTM A380/A967 where specified
Certificate of Conformance (CoC) to your purchase order requirements

When the EOR asks which welder made a moment connection and under which procedure, the answer is already in the binder.