Weld groove milling machine for shells 3000–15000 mm in diameter, 75 kW spindle and 120 mm cutting depth. Extended 60-month warranty included.
| Workpiece diameter | 3000–15000 mm |
| Workpiece length | 2000–4000 mm |
| Cutter | Φ950 mm, cutting depth 120 mm, optionally 150 mm |
| Spindle drive | 75 kW servo motor, output torque >9600 Nm |
| Spindle speed | 0–70 rpm (continuously adjustable) |
| Milling accuracy | ≤±2 mm, depending on shell movement |
| Power supply | AC 380 V / 50 Hz, 85 kW |
| On-site movement | By crane or forklift |
| Dimensions | Approx. 4.6 × 2 × 2 m |
| Weight | Approx. 12 t |
On thick-walled shells, the quality of the external weld depends on the groove you prepare beforehand. A weld groove milling machine creates this groove by machining, with constant depth and profile, instead of manual work with the arc and the grinder. LAZIRON NF75 automatically mills the grooves for external welds, in the 4 o'clock position, on cylindrical and conical shells and pipes 3000–15000 mm in diameter and 2000–4000 mm long.
In the shell production flow, NF75 steps in between internal welding and external welding: it prepares the external groove for filling, along the entire length of the seam. It replaces air-arc gouging and manual grinding, operations that are noisy, smoky and whose result depends on the operator's hand. A uniformly milled groove is also the condition for high-deposition welding technologies, and a weld groove milling machine delivers it the same way on every shell in the batch. See also the other auxiliary equipment for shell and heavy structure fabrication.
• Automatic operation: the groove is milled automatically along the full length of the weld, on cylindrical and conical shells, without the operator guiding the tool along the seam.
• Powerful spindle, high torque: the 75 kW servo motor, coupled with a gearbox drive, gives an output torque of over 9600 Nm, so the Φ950 mm cutter cuts efficiently even at great depths.
• Laser-controlled depth: a laser distance measuring device keeps the milling depth uniform, for an accurate groove from one end to the other.
• Tools made to the weld profile: the cutter disc is designed to the weld profile, and tools for other groove angles can be made on request. The standard configuration is a disc for milling U-grooves.
• Continuously adjustable speed: the spindle runs at 0–70 rpm, continuously adjustable, so you can adapt the cutting regime to the material and depth.
• Easy to move: the machine is moved on site with a crane or forklift, so you can bring it to the shell, on the turning rolls line, instead of moving the part. For a shell weighing several tonnes, this means fewer overhead crane manoeuvres and less time lost between operations.
• Groove ready for high-deposition welding: a U-groove with a constant profile allows filling with multi-wire automatic welding processes, which require uniform geometry along the entire length of the seam.
• No fumes and no carbon: mechanical milling avoids the fumes and carbon deposits of air-arc gouging, and the groove comes out clean, ready for welding.
| Parameter | Value |
|---|---|
| Model | LAZIRON NF-75 |
| Workpiece diameter | 3000–15000 mm |
| Workpiece length | 2000–4000 mm |
| Cutter | Φ950 mm, cutting depth 120 mm, optionally 150 mm |
| Spindle drive | 75 kW servo motor, output torque >9600 Nm |
| Spindle speed | 0–70 rpm (continuously adjustable) |
| Milling accuracy | ≤±2 mm, depending on shell movement |
| Power supply | AC 380 V / 50 Hz, 85 kW |
| On-site movement | By crane or forklift |
| Dimensions | Approx. 4.6 × 2 × 2 m |
| Weight | Approx. 12 t |
The best-known application is the fabrication of monopiles for wind turbines, especially for offshore farms: large-diameter, thick-walled shells, welded longitudinally and circumferentially. On an offshore wind turbine, the foundation carries large loads throughout its service life, and the weld grooves must be prepared uniformly on every shell. A weld groove milling machine does this the same way on every part in the batch.
The same machine suits pressure vessels, including high and very high pressure vessels, vessels for the chemical and nuclear industries, thick-walled steel tanks, as well as submarine construction and the defence industry. Wherever the groove is deep and its profile is set by the welding procedure, mechanical milling brings repeatability. The machine also suits plants that produce pressure equipment, vessels for the chemical industry or heavy components for energy, where groove preparation takes up a significant share of fabrication time.
The machine is built with CE-certified components, in line with the requirements of the Machinery Directive 2006/42/EC. After the U-groove is milled, the seam can be filled with a multi-wire welding system; see the LAZIRON multi-wire welding system for longitudinal and circumferential seams.
1. The machine is brought next to the shell by crane or forklift, and the shell is placed on the turning rolls, with the seam to be milled in the working area.
2. The cutter is positioned on the external seam, in the 4 o'clock position, and the laser measuring device picks up the distance to the shell surface.
3. As the shell moves, the cutter works automatically along the entire length of the seam, and the depth is kept constant by laser measurement.
4. The milled groove, clean and uniform, goes on to external welding, without further preparation.
Unlike a workshop metal milling machine, where the part comes to the tool, here the tool comes to the part: the shell stays on the turning rolls line, and the machine is placed next to it. For parts thousands of millimetres in diameter, this eliminates heavy and risky handling between stations.
Milling accuracy is ≤±2 mm and depends on the shell's movement, so stable turning rolls matter as much as the machine. We check your existing turning equipment together with your team before commissioning, so the weld groove milling machine works at the required parameters from day one.
For operators, the work comes down to preparing the tool, setting depth and speed and supervising the process. There is no more need for hours of gouging and grinding in awkward positions, with a mask and hearing protection, and the time saved moves to welding, which is where value is created.
• 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.
with a 3-in-1 laser machine (welding + cleaning + cutting) and a smart capital decision
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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„We do stainless-steel metal fabrication dedicated to restaurant kitchens. The UZINEX equipment was a radical change: modernization, an increase in production and quality.”
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