Electric Resistance Welded Tube
General information on ERW tubes
Steel tubes can be manufactured using common hot and cold rolling techniques, or through electric resistance welding. The finished product of which is commonly shortened to ERW tube. Although light weight, ERW tubes have great structural performance and are therefore applied in variety of industrial and non-industrial sectors. Like round hollow sections, ERW tubes have more stiffness in twisting and are often used for low and medium pressure applications such as the transportation of liquids and gasses.
How are ERW tubes manufactured?
ERW tubes are manufactured from steel sheets. The steel is passed through a mill system, whose rollers bend the sheet until its edges meet. Then, high frequency electric resistance welding progressively fuses the longitudinal seam shut (adding no filler material in the process). The majority of the heat for the welding process is generated by the electrical resistance of the material, hence the name ERW.
Which industries utilise ERW tubes in their manufacture?
ERW tubes are versatile in application and hence utilised for:
- Electrical engineering
- Display/Shop fittings
What are the benefits of ERW tubes?
ERW welding can be applied when manipulating both high and low strength materials.
Welding tube using the electric resistance method creates a very uniform, straight end product with one continuous weld. Hence no re-straightening is required.
High- frequency electrically welded tubes can be produced at high speeds.
Additional benefits of ERW tubes:
- high carrying capacity
- easy manipulation
- aesthetically appealing