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Welded Steel Tube from Coil (ERW)
Most everyday steel tube is electric-resistance welded (ERW). Steel strip slit from a coil is bent cold through a row of shaped rolls until its edges meet as a round tube; a current passed across the edges heats them, and rolls squeeze them together into a weld with no filler metal. The bead squeezed out is trimmed off, sizing rolls bring the tube to its final diameter, and a flying saw cuts it to length. Low-frequency current was used from the 1920s until 1970, when high-frequency welding replaced it because it gives a better seam.
Advanced
Continuous (industrial)
Instructions
1
1
Slit the coil
Slit the coil
The steel coil is slit into strip as wide as the tube's circumference.
Materials for this step:
Steel Coil1000 kg2
2
Roll-form
Roll-form
The strip passes a series of shaped rolls that curl it, step by step, into an open round tube.
Tools needed:
Tube Roll-Forming Mill3
3
Weld the seam
Weld the seam
High-frequency current, induced by a coil or fed by contacts, heats the two edges and squeeze rolls press them together into a solid seam.
Tools needed:
High-Frequency Tube Welder4
4
Trim, size and cut
Trim, size and cut
A cutting tool right after the welder planes off the outside bead; the tube cools, sizing rolls set the diameter, and a flying cut-off cuts it to length while it moves.
Tools needed:
Tube Roll-Forming Mill5
5
Check
Check
Diameter and wall thickness are measured; the seam is tested.
Tools needed:
Digital Caliper 6-InchMaterials
1- 1000 kgPlaceholder
Tools Required
3- Placeholder
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