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ERW Pipe Manufacturing Process

ERW pipes means Electric Resistance Welded Pipes. A plate rolled to become a pipe and welded using Electric Resistance Welding process. Usully for for high diameter. (cheapest process avaiable)
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

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.
Round forming
Round forming
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.
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De beading
In this stage, the weld flash on top and inside (if required) is trimmed out using the carbide tools.
Seam Annealing
Seam Annealing
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.

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.

Galvanizing

Galvanizing Line
Continuous Hot-Dip galvanizing mill roll out galvanized coils of International quality. These lines are supported with on line tension leveling, trimming lines and skin pass mills, to take care of special requirements of customers in terms of coating mass, width, thickness etc..
Sheet Corrugation
Corrugation machine (Sheet-to-Sheet type) capable of profiling Galvanized sheets upto 3 meters length with maximum dimensional accuracy.

All these facilities are also supported by a service center, which tailor makes the coils to customer- requirements by slitting & cutting and by delivering sheets/ coils to customer specifications.
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