DOM and It’s Benefits

What is Drawn Over Mandrel?

Drawn Over Mandrel is a type of finishing process after the manufacturing process of tubular pipes.

It is considered a high-quality tube finishing method, constructed from SAE 1020 or 1026 steel grades, widely used under ASTM A513 specification. The initial stages of manufacturing are cold drawn Electric Resistance Welded Tubes.

Read about Electric Resistance Welded Tubes here.

Def:- The process of giving the finishing touch after ERW pipes which indulges removing for entire flash weld and cold drawing of tubes over a mandrel.


  • Drawn Over: To cover up something with another thing by pulling it on the top.


  • Mandrel: Mandrel is nothing but the part inside the pipe which guides, grips or clamps it and works as a shaping It is one of the components of Cold Pilgering or Cold Drawing Mill.


  • Drawn Over Mandrel: To cover up the conjunction point or welded joint by giving finishing touch, over the mandrel and inside the pipe.



Why is it necessary?

Welding leaves back the spots (known as ‘seam’ in pipe industry), on the conjunction points in ERW manufactured pipes. To clear those spots and give end result unlike Seamless Tubes and Pipes, Drawn Over Mandrel (DOM) is necessary.

The finished tubes are usually wrongly referenced as seamless tubes after DOM process but what it actually does have a seam which is almost invisible.

What exactly happens inside the Manufacturing Mill?

The seam clearing element inside the Mill is in the oscillation motion which removes the welded spots and works as a cutter.

A small amount of residue is collected after every clearing session.

Benefits of DOM process in Welded Pipes

  • High yielding
  • Provides tensile strength
  • Uniform wall thickness
  • Smooth surface
  • High-quality
  • Multiple applications
  • Free of oxide
  • 95% same as Seamless Tubes
  • Homogeneous characteristics
  • Close Tolerances
  • Less residue collection
  • Self-dependent and thus Cost-effective
  • Reliable
  • Works on a wide range of pipe sizes

Application of DOM tubing

  • Shafts
  • Cylinders
  • Axles
  • Couplings
  • Fittings
  • Steering columns

With quality outcome and reliable applications, Metamorphosis Engitech India Private Limited manufactures tubular pipes which are DOM processed. For your plant, industry, residence or any site, in particular, we can provide a bulk as well as sets of tubes. They are made out of SAE 1020 or 1026 steel grades widely used under ASTM A513 specification.

Contact us Today
+91 8237 800 381
+91 9049 990 578

About the Author

Leave a Reply