ban_erw

Electric Resistance Welded (ERW) tubes are formed by rolling steel coils and welding along the length of the tube. We manufacture ERW precision steel tubes from mild and carbon steel alloys that conform to various industrial standards as desired by our customers from Automobile, transportation, furniture and general engineering sectors.

Size Range and Specification

SIZE RANGE:

Particulars OD Thickness
ERW 15.88 mm to 88.90 mm 1.0 mm to 6.50 mm

Note : ID Scarfed(Fincut) ERW Tubes are also available on Request
We also offer Square/Rectangular sections, Elliptical, Oval, Oblong and Triangular Tubes in desired Grades.

SPECIFICATIONS:

Particulars American Japanese
ERW / APH – IS:3074 ERW1, IS:4923, BS:6323, DIN:2393; BS:3059 ERW / APH – ASTM 423 ERW / APH – JIS 3445
Click here for detailed specification.

ERW steel hollow sections are manufactured by the High Frequency Induction Welding (HFIW) process. The process, also known as the Cold Process, uses HR strips, which are manufactured by great players like TATA Steel, ESSAR, and JSL ISPAT etc.

In the HFIW process, the slit HR coil goes through the MIG welder, while a steady flow is assured from the horizontal coil accumulator. The tubes then progressively form as the strip passes through successive rolls and is followed by the high frequency induction welding at the edges to complete the weld.

External beads due to weld deposition on the outer surface of the tubes are then scarfed to ensure a smooth surface finish.

Following the welding process, an eddy current non-destructive testing machine screens out the imperfectly welded tubes.

Tubes that pass the test are cut into required lengths by saw, which gives a smooth burr-less square cutting edge.

Tubes are then finally Inspected , Packed & Dispatched to the customer.

Following is the diagrammatic representation

erw_process_flow