U-rib internal welding machine for deck plates up to 16 m long, with 1–6 ribs per plate. Extended 60-month warranty and installation included.
| Deck plate width | 4500 mm |
| Base plate length | 16000 mm |
| Base plate thickness | 12–40 mm |
| U-rib height | 260–320 mm |
| U-rib width | 300–350 mm |
| U-rib thickness | 6–12 mm |
| Bevel angle | 46° |
| Number of U-ribs on the base plate | 1–6 |
| Distance between U-rib centrelines | ≥400–1100 mm |
| Automatic welding speed | 200–1000 mm/min |
| Working carriage travel speed | 200–5000 mm/min (continuously adjustable) |
| Fillet weld penetration | ≥5 mm |
| Straight-line repeatability | ±0.3 mm/10 m |
| Welding power source current | 0–1250 A |
| Equipment dimensions | 40 × 8 × 7 m |
If you fabricate deck plates for steel bridges, U-rib internal welding is the hardest operation to do by hand: the seam is made in the closed space inside the rib, where the welder has no direct access and cannot see the weld pool. LAZIRON UHN is the machine dedicated to this operation. The internal probe enters the rib, positions the torch automatically and makes a consistent seam along the full length of the base plate, up to 16000 mm. It is designed for steel structure plants that produce deck plates stiffened with U-ribs, in series.
In the production flow, the machine comes after the ribs are assembled and tacked onto the base plate, and it works together with external welding and panel straightening. It replaces manual welding inside the rib, which is slow and hard to control, with an automated process with stable parameters from one end to the other. It is part of the range of U-rib machines for bridges, alongside the assembly, external welding and straightening machines.
• Access where the welder cannot reach: the flexible arm of the internal probe enters the rib and adjusts the torch position automatically, so U-rib internal welding is done without the operator working in the enclosed space.
• Automatically metered flux: in submerged arc welding, the flux layer must be uniform for the arc to stay covered. The machine automatically controls flux placement, so the welding regime stays stable along the full length of the plate.
• Controlled penetration: the fillet weld reaches a penetration of at least 5 mm, a clear value you can enter in the welding procedure and verify at quality control.
• Up to 6 ribs on the same plate: the machine works on deck plates 4500 mm wide, with 1–6 U-ribs and centreline spacings of 400–1100 mm, so it covers different deck configurations with the same equipment.
• Adjustable speeds: automatic welding runs at 200–1000 mm/min, and the working carriage travels at 200–5000 mm/min, continuously adjustable, for fast moves from one rib to the next.
• Repeatable straight path: a repeatability of ±0.3 mm/10 m keeps the welding head on the same line, and consistent welding produces minimal distortion, so less work at panel straightening.
• Less labour: the high degree of automation shortens production cycles and frees qualified welders for the operations where they are really needed.
| Parameter | Value |
|---|---|
| Model | LAZIRON UHN |
| Deck plate width | 4500 mm |
| Base plate length | 16000 mm |
| Base plate thickness | 12–40 mm |
| U-rib height | 260–320 mm |
| U-rib width | 300–350 mm |
| U-rib thickness | 6–12 mm |
| Bevel angle | 46° |
| Number of U-ribs on the base plate | 1–6 |
| Distance between U-rib centrelines | ≥400–1100 mm |
| Automatic welding speed | 200–1000 mm/min |
| Working carriage travel speed | 200–5000 mm/min (continuously adjustable) |
| Fillet weld penetration | ≥5 mm |
| Straight-line repeatability | ±0.3 mm/10 m |
| Welding power source current | 0–1250 A |
| Equipment dimensions | 40 × 8 × 7 m |
The main purpose of the UHN machine is producing U-rib deck plates for steel bridges: road and rail bridges with a steel superstructure, overpasses and viaducts. The deck of a steel bridge consists of several panels, each with several ribs, and internal welding is repeated on every one of them. What matters here is that each seam is identical to the previous one, and an automatic machine does exactly that, panel after panel.
Besides bridges, the equipment suits shipbuilding workshops, the construction of offshore platforms and wind turbine structures, pressure vessel fabrication, process plant engineering, general steel construction and mechanical construction contractors. Wherever you work with long plates stiffened with closed profiles, automated U-rib internal welding reduces dependence on manual welding.
The machine is built with CE-certified components, in line with the requirements of the Machinery Directive 2006/42/EC, which simplifies the line's conformity documentation. If you also need the seams on the outside of the same ribs, see the LAZIRON machine for external U-rib welding, which completes the flow.
1. The base plate, with the U-ribs already assembled and tacked, is placed on the workstation. The machine accepts base plates of 12–40 mm and ribs 6–12 mm thick.
2. The parameters are set for the panel configuration: the number of ribs (1–6), the distance between their centrelines and the welding speed, between 200 and 1000 mm/min.
3. The working carriage is positioned at the first rib, and the internal probe enters the rib. The flexible arm automatically brings the torch into welding position, on the joint bevelled at 46°.
4. Flux is metered automatically onto the joint, and the welding power source, with a current of 0–1250 A, makes the fillet weld along the full length of the plate, with a penetration of at least 5 mm.
5. At the end of the stroke, the carriage moves to the next rib, at a travel speed of up to 5000 mm/min, until all the ribs on the panel are welded.
6. The welded panel moves on to external welding and straightening, then to the assembly of bridge sections.
• Delivery, installation and commissioning, with operator training on your own parts.
• 60-month warranty and service with on-site response in under 24 hours in Romania (24–72 hours in other countries).
• Technical documentation for EU-funded, PNRR and public procurement projects.
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All delivered equipment meets European quality standards and the DNSH principle, is eligible for acquisitions through EU and PNRR funding, and includes interactive AI-powered manuals for operation, maintenance and operator training.
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