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ERW (Electric Resistance Welding) in the pipe mill (Tube Mill Machine) is mainly used for the manufacture of high-frequency welded pipes, the core process is as follows:

Forming Stage

The steel strip is gradually rolled into a round tube through several sets of rolls, and the edges of the two sides are aligned to form the welded seams to be welded.

Welding stage

High-frequency current: High-frequency current is passed to the seam through electrodes or induction coils, utilizing the resistive thermal effect to instantaneously heat the edges of the steel strip to a molten state.

Pressurized Welding: At high temperature, the rolls apply pressure to fuse the molten edges to form a continuous weld seam without additional welding consumables.

Post-processing

Cooling and sizing: After cooling the welded pipe, the outer diameter and roundness are adjusted by sizing rolls to ensure dimensional accuracy.

Weld seam treatment: On-line non-destructive testing (e.g. ultrasonic) or regrinding is possible to ensure the strength and surface quality of the weld seam.

Advantages and Uses

High efficiency and low cost: fast continuous production speed, suitable for high volume manufacturing.

Reliable strength: weld seam strength is close to that of the base material, suitable for oil and gas transportation, building structures, etc.

High flexibility: steel pipes of different diameters (usually φ20-φ600mm) and thicknesses can be produced, with materials covering carbon steel, alloy steel, etc.

Summarize: ERW achieves high efficiency welding by resistance heat in pipe mill, combined with forming and sizing process, to produce cost-effective LSAW pipes, which are widely used in industrial and infrastructure fields.

Get more information about ERW in tube mill machine:https://erwpipemills.com/what-is-electric-resistance-welding-principles-types-and-applications/