Welded beam is mainly used to manufacture metal structures.

Welded beams are cost-effective in the construction of buildings and structures.

Welded beams are used in the construction of floor decks, coatings, support pillars, working platforms, scaffold bridges, bridges, crane beams and other steel structures.

Welded beams are especially effective in long span structures of industrial buildings, shops and other facilities.

Welded flange beams are the most common sections, widely used in construction and engineering industry, and T-sections are commonly used in shipbuilding industry.

Welded beams are used as structural metal frames that allow not only to facilitate the construction members possessing unnecessarily large safety factor, but also to create more cost-effective form of supports and cross-sections of individual members, thus reducing the weight of the metal structure.

Welded beam is a welded sheet steel construction with mechanical parameters similar with those of beams made of hot-rolled metal in accordance with GOST 26020-83 hot or STO ASCHM 20-93.

Our company warrants that the calculated mechanical properties of welded beam are as good as those of than the corresponding size of the hot-rolled beam.

The limit deviations in the size and shape of the cross-section are in accordance with STO ASCHM 26020-83 or GOST 20-93.

The welded beam produced by “Poltavaspetsmontazh LLC” is manufactured with wall height (H) from 300 to 1200 mm, wall thickness (s) from 6 to 14 mm and shelves (t) from 8 to 20 mm, a width of the shelves (B) from 150 to 500 mm and a length of 14 m.

The theoretical weight is indicated with the accuracy of +/- 3%. The final weight is determined upon the production

  • In the process of welded beams manufacturing the sheet 12 meters long is used allowing to eliminate cross joints along its length.

  • Ultrasound check of butt welds and T-shaped welds is performed by agreement with the customer.

  • Welded beams are made according to individual customer’s drawings or replace a similar hot-rolled beam up to 14 m long.

In process of welded beams manufacturing steel flat products are mainly used (steel grade

  • 3SP5/SP5

  • 09G2S)

The manufacturing process of welded beam consists of the following stages:

  • Cutting of metal sheet into strips of desired length and width by means of CNC machine for plasma cutting.

  • Machining process of the strip ends by means of end-milling machine or edge planer. Clean and smooth edges ensuring the improvement of further welding quality are obtained from this process.

  • Assembling of welded construction from three prepared steel members on-machine be means of cranes. Tack welds are fitted from one side to ensure strength and stiffness of the beam during its transferring to the place welding work performance.

  • Welding of straight butt welds, longitudinal joints, fillet welds and girth seam under a uniform flux layer. The main seams are welded in total.

  • Tapping die of welded beam tapes through the specific roll system, resulting in recovering of their geometry and loss of “mushroomlikeness”.

  • Drilling of holes of the desired diameter in the walls of the beam for the fitting of rivet joints and screw connections. Before this procedure the location of future holes are accurately marked with single-points perforation followed by expansion by method of drilling.

  • Overlapping of the beam with anti-corrosion coating by airless spraying and further drying of the construction.

ADVANTAGES of welded beams

Metal structures including a welded flange beam a welded double-tee beam, provide tangible economic benefits in the construction of various structures and buildings different in their type.

The use of welded flange beams in the composition of framed metallic structures can significantly alleviate the members of these structures with increased safety factor.

In addition, the use of welded beams enables the creation of cost effective forms of supports.

This in turn reduces the metal consumption of buildings and structures.

  • The manufacturers of rolled metal products do not produce rolled beams larger than 60B. Therefore, welded beams are used in cases of the necessity for constructions the severity and strength of which exceed the capacity of rolled sections.

  • The use of different steel grades in the process of the beam manufacturing (bi-steel beam) allows to reduce the cost of the beam by mean of manufacturing the most stressed beams sections from high-strength steel and less stressed sections – of mild steel. The possibility to use different types of steel for manufacturing the plates and walls of the beam. It ensures the reducing of the welded beam cost.

  • The possibility to manufacture welded beams with holes and openings, as well as to manufacture perforated beams.

The perforated wall of the beam is formed by cutting the wall of an I-beam in a zigzag line, followed by a shift of halves and butt welding of the parts of the I-beam on the walls relief.

The bearing capacity of the cross-cutting I-beams exceeds the carrying capacity of the original I-beam, as achieved by their higher altitude.

The main advantage of welded beam is the decrease of cost and timing necessary for INSTALLATION WORKS THROUGH:

  • reduction of the structural mass (compared with r/k beams), by:

    • possible optimal selection of composite section as compared with rolled sections, thereby the weight of the structure can be reduced up to 15%;

    • possible use of different types of steel in the beam section for the walls and plates;

    • possibility of manufacturing of asymmetrical sections;

    • higher carrying capacity;

  • increase of the width of building bays by mean of the production of beams of greater length (compared to g/k);

  • minimize of waste during construction and installation by mean of the production of welded beam with required length, which allows to abandon the factor 1.2 to waste determined by the manufacturers in the engineering of buildings from rolled sections;

  • periodic stock-out of the welded beam and the limitation of its nomenclature


  • Welded beam with sloping internal faces – without the letter (not manufactured);

  • Welded beam with sloping internal faces for overhead runway system – M (not manufactured);

  • Welded beam with parallel faces of plates – a narrow plated – U;

  • Welded beam with parallel faces of plates – column – К;

  • Welded beam with parallel faces of plates – a broad – plated – Sh;

  • Welded beam with parallel faces of plates – standard – B;

  • Welded beam with parallel faces of plates – medium-plated – D;

  • Welded beam for equipping of mine shafts with sloping internal faces not exceeding 16% – C (not manufactured).


Cross-section of flange welded beam should correspond the cross-section specified in the figure.

Н– beam height; h– height of the beam wall; s– wall thickness; t– plate thickness; В– plate width.

Welded beam dimensions, cross-sectional area, the weight of 1 meter of the beam and geometric values for the axes are shown in Table 1.

Welded flange beam is manufacturing in length from 3 to 14 m in accordance with the order.

Table 1


Analogue of rolled beam

Dimensions (mm)

Cross-sectional area (cm2)

Weight of 1 m (kg)

Reference values for the axes

Note (cross-section analogue in the context of document)

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