Northern Manufacturing fabricates custom stainless steel I-beams, plate girders, and built-up structural sections from plate at our Oak Harbor, Ohio shop. Web and flange blanks are cut on a 12 kW Trumpf TruLaser 5040 Fiber laser (stainless plate to 1.25 inches), welded in robotic cells with laser vision seam tracking, and finished by AWS-certified welders working to AWS D1.6 qualified procedures. If the grade exists as plate, the beam can exist: 304L, 316L, duplex 2205 and 2507, AL-6XN, Hastelloy, and carbon steel.
ISO 9001:2015 certified by AVU Registrations (IAS-accredited, certificate #00157-4). AWS Certified Welding Inspector (CWI) on staff, weldment tolerances to ISO 13920, and a 60+ welder department behind the robots. Robotic stitch welding is what makes a one-off section price-competitive with standard shapes: automation takes the labor hours out of the long repetitive seams.
Why Fabricate the Beam Instead of Buying It
Sourcing stainless structural sections is a three-way squeeze. Mills roll a short list of stainless shapes, specialty grades are rarely rolled at all, and the sections that do exist carry distributor pricing and minimum buys sized for stockists rather than projects. An engineer who needs four duplex beams at a custom depth is not the customer that supply chain was built for.
Building the beam from plate changes the constraint set:
- Material flexibility. Plate is stocked and traded in every grade we run. A beam in 2205, AL-6XN, or Hastelloy C-276 starts from the same plate supply as our tanks and frames, with MTRs traced by heat number.
- Design freedom. Depth, flange width, and web thickness are variables in your model, not fixed catalog rows. Tapered webs and variable-depth profiles cost a cut file, not a custom mill run.
- One vendor, one standard. The beam, the frame it bolts into, and the assembly on top of it can all come off the same floor under the same ISO 9001:2015 system.
What We Build
I-beams and wide-flange equivalents in custom dimensions, plate girders for spans and loads the rolled catalog skips, tapered and variable-depth members, and built-up sections with stiffeners, bearing plates, copes, and bolt patterns already in place. Connection details are cut into the flat blank on the laser, so holes land where the model says instead of where a magnetic drill wandered.
We fabricate to your engineer’s print. Section sizing, load calculations, and code design responsibility stay with the engineer of record; our job is to produce the member exactly as drawn and prove it with documentation.
How a Beam Gets Built
| Step | Machine or process | What happens |
|---|---|---|
| Web and flange blanks | Trumpf TruLaser 5040 Fiber, 12 kW | Cut from plate to 1.25 in with weld preps, copes, and bolt patterns in the flat |
| Fit-up and tacking | Fixtured fit-up by our craftsmen | Web set square to flanges, camber built in where the drawing calls for it |
| Web-to-flange seams | Robotic stitch welding with laser vision | Stitches placed on the actual joint, heat balanced side to side |
| Continuous heavy seams | Submerged arc welding (SAW) | Full-length girder welds at high deposition with a consistent bead |
| Details and tie-ins | Manual GTAW / GMAW | Stiffeners, end plates, and bearing details to AWS D1.6 WPS |
| Verification | Leica AT960 laser tracker, ISO 13920 | Camber, sweep, and connection locations checked against the CAD model |
The robotic cells are the reason this process beats a milled section on cost for so many jobs. A beam is long, repetitive welding, which is exactly what a robot does best, and the laser vision system adapts each stitch to the joint as built rather than the joint as programmed. Fit-up variation and heat distortion get absorbed instead of becoming rework.
Straight Beams Are a Heat Problem
Every weld on a beam pulls it. Lay all the stitches down one side and the member sweeps like a banana; stack heat too fast and it twists. Our approach treats straightness as a welding-sequence parameter: stitch patterns alternate sides to balance heat input, interpass discipline comes from the same procedure culture as our stainless welding department, and alignment is checked during fabrication rather than discovered at final inspection.
Tolerances follow ISO 13920, with Class B/F as the shop default and Class A/E available for precision weldments. On critical members we put a Leica AT960 laser tracker on the finished beam and report camber, sweep, and hole locations against your model. That measurement discipline is the same one that held a 100-foot stainless trough straight within 1/8 inch.
Quality Documentation
Every fabricated beam ships with a package built for a structural file:
- Material Test Reports (MTRs) traced by heat number for web, flange, and detail material
- Weld maps tying each joint to its WPS and welder
- AWS D1.6 WPS and WPQ packages for the procedures used on the member
- NDE reports (VT, PT, RT, UT) as specified on the drawing, performed in-house
- Dimensional records, including laser tracker reports when specified
- Certificate of Conformance to your purchase order
If your spec calls for PMI on specialty alloys or ferrite measurement on duplex members, both run in-house and the records go in the same package.