ERW Pipes And How It Differs From Other Pipes?

What is Welding?

What we see constructions workers do when they are wearing a mask and producing a spark through a device, is the process of welding.

The process in which one, two or more metal are joined at a point or whole, with the application of pressure and or heat is simply termed as Welding.

With advanced technology, the pipes are welded in companies through machines and not manually.

Types of Welding

  1. Fusion Welding: The welding in which metals are joined relying on their melting point and material composition is fusion welding. Further, it has its own techniques classified as Gas, Arc and Chemical Welding.
  2. Non Fusion Welding: The welding in which metals are joined by application of pressure and without melting the parent material is called Non-Fusion Welding. Further, it has its own techniques classified as Pressure, Cold Pressure, Cryogenic, and Electric Resistance Welding.

Our topic of study: Electric Resistance Welding (ERW)

What is Electric Resistance Welding?

The process of welding where metals’ two surfaces in contact are bonded or merged by the applied pressure and produced heat with respect to time is Electric Resistance Welding.

Application of ER Welding in the production of pipes:

First, a plain metal sheet is produced. Further, it goes to form a cylindrical pipe. The in-between process uses ERW or Electric Resistance Welding where the metal sheet’s both the ends are joined with weld rolls or roll plates by application of pressure and by passing an electric current through.

Electric currents are produced by the electrode (of the procession machine) while the heat by the contact point and friction caused by a metal sheet, in resistance with each other.

The orange-yellow rings are nothing but electrode. It is holding the sheet turned into the pipe by rolls side by.


Electric: Electricity produced by electrodes in the process.

Resistance: A force that tends to oppose the motion. Here metal sheet and electrode are in resistance.

Welding: Joining of the metal sheet.

Types of methods used to manufacture welded pipes:

  1. SAW: Submerged Arc Welding involves arc formations between the electrode and the metal sheet. A blanket of powdered flux is added to submerge the arc beneath it, keeping the arc invisible, during welding.
  2. HFW: High-frequency Welding is also known as radio frequency welding which uses higher frequency waves to heat and forms a melting point to weld.
  • EFW: Electric Fusion Welding same as electric welding which relies on melting point and not on pressure.
  1. ERW: Electric Resistance Welding

Why Electric Resistance Welded pipes in comparison to other types?

  • The welded joint is given finishing in the ERW mill itself, to clean the spots or blotches produced by heat and electricity.
  • The finishing results into the similar output as seamless pipe manufacturing, thus, the welding joint is almost invisible.
  • The low frequency welding process
  • Cost-effective
  • High production efficiency
  • Less Manual interference
  • Time-saving
  • High accuracy and precision in size and roundness
  • Smooth surface with the clear appearance
  • Endless lengthened metal sheets can be involved thus endless or desired pipe lengths can be obtained.
  • 2mm to 6.5 mm thickness of pipes ideal for application

Application of Electric Resistance Welded pipes

  • Water pipelines needed for Agriculture, irrigation, sewerage systems, industrial lines, deep tube wells, plant piping, etc
  • Gas pipelines of LPG and other non-toxic gases
  • Shallow Water applications like a canal, stream, culvert, etc.


Previously, ERW pipes were produced with unfinished welding that led leakages and accidents but Metamorphosis Engitech India Private Limited (MEIPL) manufactures defectless and flawless ERW pipes with guaranteed durability.

For enquiry regarding the pipes connect us today.

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