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ERW Pipe Manufacturing Process

Typical ERW Pipe Manufacturing Process

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

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.

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

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

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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