Multi-head U-rib welding machine with automatic seam tracking, fillet weld penetration of at least 5 mm on bridge decks. 60-month warranty.
| Base plate (panel) width | ≤4500 mm |
| Base plate length | ≤18000 mm |
| Base plate thickness | 12–40 mm |
| U-rib height | ≤320 mm |
| U-rib width | 300–550 mm |
| U-rib thickness | 6–12 mm |
| Angle between U-rib and base plate | 106° |
| Bevel angle | 46° |
| Number of U-ribs on the base plate | 1–6 |
| Distance between U-rib centrelines | 500–900 mm |
| Automatic welding speed | 200–1000 mm/min |
| Fixture carriage travel speed | 200–5000 mm/min (steplessly adjustable) |
| Fillet weld penetration | ≥5 mm |
| Straight-line repeatability | ±0.3 mm/10 m |
| Welding power source current | 0–630 A |
| Equipment dimensions | 44 m × 8.6 m × 8 m |
A U-rib welding machine decides the quality of an orthotropic bridge deck: the fillet welds between the ribs and the deck plate are what carry the repeated traffic loads, year after year. LAZIRON UH welds the external seams of U-shaped ribs with several heads simultaneously, with automatic seam tracking and a fillet weld penetration of at least 5 mm. It works with base plates up to 4500 mm wide and 18000 mm long and with ribs 300–550 mm wide, for plants that produce deck panels in series.
In the production flow, UH comes after the ribs are assembled on the deck plate and before internal welding and panel straightening. It replaces semi-automatic welding with tractors moved from one rib to the next, where penetration and bead appearance depend on each welder and where a long panel keeps a whole team busy. See the full range of machines for U-ribs and bridge decks, covering assembly, welding and straightening.
• Several welding heads simultaneously: the U-rib panel is welded with several heads at the same time, so the time per panel drops compared with welding rib by rib.
• Automatic seam tracking: the heads follow the joint by themselves along the full length, and the bead stays in position even if the panel has small assembly deviations.
• Welding in the boat position: the tilting clamping frame inclines the part so that the U-rib fillet weld is made in the boat position. Penetration is stable and the bead looks good.
• Penetration of at least 5 mm: a U-rib welding machine with controlled parameters ensures a fillet weld penetration of at least 5 mm, the requirement that counts at deck inspection.
• Straight line over long lengths: a straight-line repeatability of ±0.3 mm/10 m keeps the heads on track on panels up to 18 m.
• Dual servo-driven gantry: smooth, even travel, without jerks that would spoil the bead.
• Adjustable speeds: automatic welding at 200–1000 mm/min, while the fixture carriage travels at 200–5000 mm/min, steplessly adjustable.
• Ready for the digital factory: the reserved MES interface allows the machine to be connected to production tracking systems.
| Parameter | Value |
|---|---|
| Model | LAZIRON UH |
| Base plate (panel) width | ≤4500 mm |
| Base plate length | ≤18000 mm |
| Base plate thickness | 12–40 mm |
| U-rib height | ≤320 mm |
| U-rib width | 300–550 mm |
| U-rib thickness | 6–12 mm |
| Angle between U-rib and base plate | 106° |
| Bevel angle | 46° |
| Number of U-ribs on the base plate | 1–6 |
| Distance between U-rib centrelines | 500–900 mm |
| Automatic welding speed | 200–1000 mm/min |
| Fixture carriage travel speed | 200–5000 mm/min (steplessly adjustable) |
| Fillet weld penetration | ≥5 mm |
| Straight-line repeatability | ±0.3 mm/10 m |
| Welding power source current | 0–630 A |
| Equipment dimensions | 44 m × 8.6 m × 8 m |
The dimensions of 44 m × 8.6 m × 8 m show that UH is a machine for a hall dedicated to deck panels, designed to work in line with the assembly machine and the straightening machine.
The main application is the orthotropic deck of a steel bridge, road, rail or pedestrian. The fillet welds between the U-ribs and the deck plate are the areas most exposed to fatigue, and insufficient or uneven penetration becomes, over time, the starting point for cracks. For plants that supply panels for steel bridges, a U-rib welding machine with automatic seam tracking and controlled penetration means panels that pass weld inspection without repairs.
The same type of stiffened panel also appears in offshore construction, wind turbines, heavy steel structures, mechanical works contractors, process plants, pressure vessels, shipbuilding and industrial equipment. This means road and rail infrastructure projects, but also shipyards and the plants working for offshore wind farms. The equipment is delivered with CE-certified components, in line with the requirements of the Machinery Directive 2006/42/EC.
UH is part of a complete bridge construction flow. Before it works the U-rib assembly machine, which ensures the small gap between rib and plate, and after it come internal rib welding and panel straightening.
The flow on a U-rib welding machine is built around the tilting frame and the multi-head gantry:
1. Loading the panel: the assembled panel, with 1–6 U-ribs tacked to the base plate, is brought onto the machine's clamping frame.
2. Tilting into the boat position: the tilting frame inclines the panel so that the fillet weld between rib and plate is in the boat position.
3. Positioning the heads: the welding heads are brought onto the rib joints, at the panel's centreline spacing (500–900 mm).
4. Welding with seam tracking: the gantry travels along the panel at 200–1000 mm/min, and the heads automatically track the seam, with a penetration of at least 5 mm.
5. Changing sides: the frame tilts for the other side of the ribs, and the process is repeated.
6. Discharge: the externally welded panel moves on to internal welding and straightening.
The difference from semi-automatic welding shows in non-destructive testing. With manually moved tractors, each bead depends on how the welder positioned it and how steady the travel was. With automatic seam tracking and the boat position, all seams on the panel are made with the same parameters, and penetration stays within limits along the entire length.
Productivity matters too. Several heads weld simultaneously, and the carriage repositions quickly, at up to 5000 mm/min. An 18 m panel no longer ties up a team for a whole day, and the pace of the deck line can be planned by the week.
There is one more aspect bridge clients follow closely: traceability. Automatic welding with controlled speed, current (0–630 A) and path produces comparable seams from one panel to the next, and the reserved MES interface allows parameters to be linked to each panel. When a U-rib welding machine works like this, the deck's quality dossier is much easier to build, and discussions with inspectors move from repairs to confirmations.
• 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.
Products and services that have earned the appreciation and trust of clients across industry.
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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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Six technology directions we integrate turnkey: from plug & play IIoT sensors, to cobots, predictive maintenance, optical inspection, MES connectivity and custom industrial software.
See in real time how much each machine produces and how long it sits idle. We fit sensors on any equipment, new or old, and within a few hours you have the OEE dashboard on your phone. No complex wiring, no production downtime. The first concrete step toward digitalization, with ROI visible from the very first month.
Solve your labor shortage without tripling your costs. The cobot works safely alongside your people (palletizing, feeding the CNC, welding) while you recover the investment in 12-18 months. Prices 30-40% below European distributors, with installation and programming included from us.
Stop waiting for things to break. Our algorithms analyze sensor data and tell you exactly which part will fail and when, and we bring it to your production line before the breakdown. Zero unplanned downtime, zero contractual penalties, complete operational peace of mind.
Eliminate defects before they reach the customer. Our cameras inspect every part at speeds no operator can match, detecting sub-millimeter defects. They mount onto your existing line, with no modifications. Ideal if you produce for export and have strict quality clauses.
Connect your machines to your office, regardless of brand or age. Our gateway automatically translates the data from any machine into your ERP's format: no manual entry, no paper forms, no human error. The manager sees production live, the operator receives digital instructions.
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