7-Axis Rail-Mounted Welding Robot
For H-beams, columns, crane runway beams and curved beams, with their stiffeners, corbels and cleats.
- Width ≤ 1,500 mm
- 12 m rail, 10.63 m travel
- STEP / IFC import
Welding robots for steel structures
Robotic Welding Systems for Structural Steel
Two main robotic welding systems cover most structural steel: a rail-mounted robot for beams and columns, and a cantilever robot for wide plates and bridge units. Both plan their own weld paths from your 3D model.
Factory-direct pricing from the manufacturer, and a free evaluation of your parts before you decide.
Our Two Main Welding Robots
8-Axis Cantilever Welding Robot
For bridge plate units, diaphragms and wide stiffened plates, welded from above.
- Width ≤ 3,500 mm
- Stiffeners ≤ 600 mm
- With or without drawings
| Compare | 7-Axis Rail-Mounted | 8-Axis Cantilever |
|---|---|---|
| Typical parts | H-beams, columns, crane runway beams, curved beams, corbels and cleats | Bridge plate units, diaphragms, stiffened and wide planar plates |
| Robot position | On a travelling ground-rail carriage beside the part | Suspended from a travelling cantilever above the part |
| Workpiece width | Up to 1,500 mm | Up to 3,500 mm |
| Effective travel (standard) | 10.63 m on a 12 m rail | 12 m on a 15 m frame |
| Programming | From a STEP/IFC model; scan-based for flat stiffened plates | From a STEP/IFC model; scan-based or parametric without drawings |
| Staffing | One operator runs 3–6 stations | One operator runs 3–6 stations |
Which Welding Robot Do You Need?
Start from the parts you weld most. If they fall into more than one group, send us a typical part of each.
Beams and columns
7-Axis Rail-Mounted Robot
Long members up to 1,500 mm wide, welded from the side and from above.
Wide plates and bridge units
8-Axis Cantilever Robot
Flat assemblies up to 3,500 mm wide, welded across the full width from above.
Box columns, full-penetration seams
Submerged Arc Station
Root, fill and cap passes on box columns and H-sections, with seam tracking.
Not sure yet
Free Part Evaluation
Send a drawing, model or photo. Our engineers recommend a system and quote it.
Compare rail-mounted, cantilever and gantry layoutsOther welding robot systems6, 7, 8 or 9 axes: which do you need?Submerged arc welding robotBeam and column weldingBridge steel weldingPEB steel building welding
From One Station to a Steel Structure Welding Line
You can start with one robotic welding station and add more as your volume grows. In our parent company’s plants, rows of rail-mounted and cantilever stations form complete steel structure welding lines.
- Each robot typically welds 70–120 m per day shift.
- Parts are loaded by QR code from your 3D models, with no teach programming per part.
- Welded length is logged per part and can be reported to your ERP or MES.
Other Welding Robot Systems
6-Axis Welding Robot Systems
A robot on a fixed base, for parts you can bring to the station. Send us the part and we plan how it is positioned so the torch can reach each joint.
Ask about this systemCrawler Welding Robots
A compact welding robot that travels on the workpiece itself, for long seams on large components that cannot easily be brought to a fixed station.
Ask about this systemGantry Welding Systems
One or more robots hang from a gantry over the work area, for parts that are best welded from above. Send us the part and we propose the gantry size and the number of robots.
Ask about this systemPortable / Lightweight Welding Robots
A compact robot and its welding equipment on one trolley, taken to large or awkward parts that cannot come to a station.
Ask about this system7-Axis Cantilever Welding Robot
A 7-axis cantilever welding robot for steel structures: the robot hangs upside down from a cantilever that travels along the station and welds parts from above.
A simpler overhead layout for parts that need an approach from above but not the full reach of the 8-axis station.
Ask about this system9-Axis Welding Robot Systems
An inverted cantilever layout that moves the robot along a 9 m rail, 2.5 m across and 2.5 m up and down (standard), for three-dimensional frames and box structures such as equipment frames and transformer tanks.
It also suits parts without drawings: a large line scanner captures the part for reverse modelling.
See the 9-axis cantilever robotSubmerged Arc Welding Robot Station
A rail-mounted station with a 50 kg-payload robot and a 1,250 A submerged arc power source, for full-penetration root, fill and cap passes on box columns and H-sections. Single-wire and twin-wire versions.
Real-time seam tracking; 12 m rail with 10 m effective travel (standard); model import or reverse modelling.
Ask about this systemCustom Welding Robot Stations
When none of the standard layouts fits your parts, we build the station around them: travel range, number of robots and mounting are adapted to the job.
Send a drawing or photo of the part and the welds, and our engineers propose a layout.
Ask about this systemWhat We Need to Recommend a Layout
Send one typical part — a drawing, model or photo — and mark the welds you want to automate. If your parts differ a lot, send one of each type.
We check torch access, supports and loading together. These decide the layout, not the rail length or the number of axes.
Teachless Programming on Every Station
Both main systems are teachless: import a STEP or IFC model and the software finds the welds, plans the path and checks it for collisions. Flat stiffened plates can also be scanned at the station when there is no drawing.
Operators load parts and start jobs rather than programming the robot, and learn to run the station in 1–5 days.
Downloads
- Robotic Welding Systems for Structural Steel2 pages · 251 KB · PDF
- 7-Axis Rail-Mounted Welding Robot for H-Beams2 pages · 235 KB · PDF
- 8-Axis Cantilever Welding Robot for Bridge Steel & Plates2 pages · 273 KB · PDF
- 9-Axis Inverted Cantilever Welding Robot1 page · 42 KB · PDF
- Submerged Arc Welding Robot for Box Columns and H-Beams2 pages · 138 KB · PDF
Not Sure Which System Fits?
Send a drawing, model or photo of a typical part. Our engineers recommend a system and prepare a factory-direct quotation — free of charge. We reply within one business day.
Or email sales@steelweldingrobot.com