The manufacturing process is completely automatic and has an optimum capacity to produce 15000 metric tones per annum. The company is using widely accepted high frequency induction resistance welding process under which the current is made to flow through contract resistance to fuse the metals that are held firming together by mechanical pressure.

This process has so many advantages like :-

It is possible to manufacture high polished tubes without any mark scratches or distortion on the surface which is inherent with other manufacturing process using surface contacts. Better welding is assured because the stitching effect which is inherent with a lower frequency welding is eliminated. Steel tubes manufactured by this process are most suitable for subsequent processing. With the high welding speed, heating time is considerably reduced. Thus removing the risk of the structure of the metal undergoing basic structural changes.

Process:


Slitting

CR Coils are slitted to predetermined widths for each size of tubes as per the outer diameter.

Uncoiling & Welding

Slitted coil is uncoiled at the entry of ERW mill and the ends are sheared and welded one after another to make it a single endless strip.

Forming

When slitted coil is passed through the ERW tube mill then at the initial stage it is bended from center and the coil obtains the U shape and then into a cylindrical shape with open edges using a series of forming rolls.

Welding

The open edges of the slitted coil are heated to the forging temperature through high frequency low voltage high current and high frequency induction resistance welding process under which the current is made to flow through contract resistance to fuse the metals that are held firming together by mechanical pressure.

Debeading

Weld flash on top is trimmed out through carbide tools.

Cooling

The steel tube formed is passed from the cooling block so that at the last roles the accurate shape can be formed. The final shape is given by the last roll sets.

Cutting

Steel tubes are cut to required lengths by flying cut off disc/saw cutter.