Welded structures

Bridging tradition and innovation, for nearly 80 years, we have specialized in small-batch production of technologically demanding welded structures and assemblies.

Precision welding for demanding projects

Since its founding, OSTROJ has focused on manufacturing machinery and components for the most challenging industrial sectors. Over the years, we have contributed to numerous complex projects—from extreme-condition mining and demolition equipment to the energy sector.

Our services go beyond welding and manufacturing medium and heavy structures up to 50 tons. We also provide optimal production process design, surface treatments, precision machining, and final assembly. By combining automated processes with the expertise of our skilled welders, we ensure exceptional quality and durability. We work with high-strength steel materials, including S355, S690, and S960, with all welding processes overseen by certified IWE/EWE welding supervision.

Our customers

Why choose OSTROJ?

80 years of experience

Leveraging decades of expertise and know-how in underground mining.

In-house production

From development to quality control, everything happens under one roof.

Cutting-edge technologies

Robotics, virtual reality, 3D printing, and skilled manual craftsmanship.

Management system

All operations are carried out in compliance with applicable standards and legislation.

Thorough technical inspection

The zero-defect strategy is our standard. Thanks to modern quality management systems and technical inspection, we ensure precision throughout the entire production process. We are equipped with state-of-the-art 3D measuring stations and advanced non-destructive testing methods.

Pressure testing
Balancing
Dimensional inspection – 3D measurement
Non-destructive testing of internal welds using ultrasound
Non-destructive testing of internal welds using magnetic testing
Comparative analysis – augmented reality
IWE/EWE welding supervision

Wet painting

We provide a wide range of surface treatments. We achieve the highest quality in industrial painting, which includes high-pressure degreasing with optional phosphating, steel grit blasting, filling, and surface preservation. We apply coatings using both standard air and high-pressure spraying techniques.

Comprehensive documentation of the entire process is standard – including process flow, time records, temperatures, thickness of individual layers, and roughness measurements after blasting.

Dimensions up to 1900×500×400 mm
Weight up to 50 t
Blasting with a quality rating of up to Sa3 and an anchoring profile of 30–60 µm

References

For nearly 80 years, we have been manufacturing equipment for work both above and deep below the surface. Explore our reference projects.

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Radek Juchelka
Head of Sales, Machinery Division

OSTROJ a.s.
Tesinska 1586/66
746 01 Opava, CZ