ERW steel pipe full form

Straight seam electric resistance welded pipe, commonly known as ERW, is used to transport vapor and liquid objects like oil and natural gas, catering to various high and low-pressure requirements. ERW pipe production boasts high efficiency, low cost, material savings, and ease of automation, making it widely applicable in industries such as aviation, aerospace, energy, electronics, automobiles, and light industry. It is a crucial welding process, playing a significant role in global transportation pipelines.

Characteristics of ERW Pipe

ERW stands for "high-frequency electric resistance welded steel pipe." Unlike ordinary welded pipes, the ERW high-frequency welding process involves forming hot-rolled coils with a forming machine. The skin effect and proximity effect of high-frequency current heat and melt the pipe blank edges, which are then pressure welded using extrusion rollers. This method forms the weld seam by melting the base material of the steel strip, resulting in a mechanical strength superior to that of ordinary welded pipes.

Production Process of ERW Pipe

The production of ERW pipes involves several stages:

Slitting

Uncoiling

Strip Leveling

Head and Tail Shearing

Strip Butt Welding

Loop Storage

Forming

Welding

Deburring

Sizing

Flaw Detection

Flying Cutting

Initial Inspection

Steel Pipe Straightening

Pipe Section Processing

Hydraulic Test

Flaw Detection

Printing and Coating

Finished Product

Main Factors Affecting ERW Steel Pipes

Several factors influence the quality and performance of ERW steel pipes:

Heat input

Welding pressure

Welding speed

Opening angle

Resistor placement

Applications of ERW Welded Pipe

ERW welded pipes are versatile and used in various applications, including:

Boilers

Automobiles

Ships

Light-structure doors and windows for construction

Furniture

Various agricultural machinery

Scaffolding

Wire conduits

High-rise shelves

Containers

In summary, ERW pipes are essential in numerous industrial applications due to their efficiency, strength, and adaptability to different pressure requirements.