Description
Steel Electric-Welded Pipes are a type of pipe product manufactured from steel sheet or strip by forming and subsequent welding of edges. Widely used in various industries and construction due to the optimal combination of strength and cost.
Production Technology

The manufacturing process includes several stages:
1.    Strip Preparation: Steel strip (skelp) is uncoiled and straightened.
2.    Forming: In forming stands, the strip is gradually bent into a pipe of round or profile cross-section.
3.    Welding: The edges are joined by one of the methods:
o    HF Welding (induction or contact) – the most common method for general applications.
o    Arc Welding (PLASMA, TIG) – for pipes with increased requirements for weld quality.
o    Laser Welding – for production of high-precision pipes.
4.    Cooling and Calibration: The pipe is cooled, passes through sizing rolls to achieve precise geometric dimensions.
5.    Cutting and Quality Control: Cut to measured lengths and undergoes non-destructive weld testing.

Characteristics and Assortment
•    Size Range:
o    Round Electric-Welded: outer diameter from 8 to 1620 mm
o    Profile: cross-sections from 15x15 to 500x400 mm, wall thickness from 0.8 to 20 mm
•    Wall Thickness: from 0.8 to 20 mm
•    Length: measured (6-12 m) and non-measured
•    Accuracy Classes: increased and ordinary

Advantages
•    Affordable Cost compared to seamless counterparts
•    High Production Efficiency
•    Wide Assortment of sizes and cross-sections
•    Good Quality of Weld Seam
•    Ability to Produce large diameter pipes
•    Smooth Internal and External Surface

Areas of Application
•    Construction: building frames, fencing structures, trusses
•    Utilities: water supply and heating systems, gas supply
•    Mechanical Engineering: mechanism structures, vehicle components
•    Furniture Manufacturing: furniture frames, decorative elements
•    Agriculture: greenhouses, fences, livestock complex structures
•    Oil & Gas Sector: auxiliary pipelines
Normative Documentation (GOST Standards)
Main standards regulating the production of electric-welded pipes:
GOST 10704-91 – "Steel straight-seam electric-welded pipes. Assortment"
•    Establishes size ranges for round pipes
•    Defines tolerances for diameter, ovality, and curvature
•    Regulates requirements for measured and non-measured length
GOST 10705-80 – "Steel electric-welded pipes. Technical specifications"
•    Defines steel grades and mechanical properties
•    Establishes methods for weld control
•    Regulates acceptance and testing rules
GOST 10706-76 – "Steel straight-seam electric-welded pipes"
GOST 8639-82 – "Steel square pipes"
GOST 8645-68 – "Steel rectangular pipes"
•    Define the assortment and technical requirements for profile pipes
Additional Standards:
•    GOST 20295-85 – for welded pipes for main pipelines
•    GOST 31447-2012 – Welded pipes for main oil and gas pipelines
•    GOST 32569-2013 – for pipes for process pipelines