Home > About Us> Tech & Service

Electric Resistance Welded Pipe

ERW Pipe Manufacturing Process

A plate rolled to become a pipe and welded using Electric Resistance Welding process.
Typical ERW Pipe Manufacturing Process

Our manufacturing process generally involves the following stages in a step by step procedure.

ERW Pipe Manufacturing process
Slitting
HR Coils are slitted to pre-determined widths for each and every size of pipes

Round forming
Round forming
Uncoiling, End Shearing And Welding

The slitted coil is uncoiled at the entry of ERW mill and the ends are sheared and welded one after another. This results in a single endless strip.

Forming

The slitted coils are initially formed into U shape and after that into a cylindrical shape with open edges utilizing a series of forming rolls.

Welding
Welding
Welding
In this stage, the open edges are heated to the forging temperature through high-frequency, low-voltage, high current and press welded by forge rolls making perfect and strong but weld without filler materials.
 
Seam Annealing
Seam Annealing
De beading
In this stage, the weld flash on top and inside (if required) is trimmed out using the carbide tools.
Seam Annealing
If required, the welding portion and heat affected zone is put to normalizing and then are cooled down in a air cooling bed.

erw-process_Sizing-Mill
Sizing

After water quenching, slight reduction is applied to pipes with sizing rolls.

This results in producing desired accurate outside diameter.

 
Cutting
In cutting stage, the pipes are cut to required lengths by flying cut off disc/saw cutter.
End Facing And Bevelling

This is usually stage, where the pipes ends are faced and bevelled by the end facer.

All these processes are continuous with automatic arrangements. These plain ended tubes further go for processing as per the customer requirements such as galvanizing, threading, black varnishing and more.

Pipe connection

Flanged

Pipe connection is varied, the commonly used have Butt weld, Flanged, Threaded, Socket weld, Glued, Brazed and Grooved end.

 


About Sunny Steel

Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

Follow us :

Tech& Service