ERW Galvanized Steel Pipe

What is ERW?

Electric Resistance Welding (ERW) is a method used to manufacture steel pipes. In this process, a flat steel strip is rolled into a cylindrical shape, and the edges are welded together using electrical resistance. This method produces a continuous and uniform seam, resulting in a strong and smooth pipe surface. ERW pipes are known for their efficiency in production and consistent quality.

ERW steel pipes are manufactured by low-frequency or high-frequency resistance "resistance". They are round pipes welded from steel plates with longitudinal welds. It is used to transport oil, natural gas and other vapor-liquid objects, and can meet various requirements of high and low pressure. At present, it occupies a pivotal position in the field of transportation pipes in the world.

During ERW pipe welding, heat is generated when current flows through the contact surface of the welding area. It heats the two edges of the steel to the point where one edge can form a bond. At the same time, under the action of the combined pressure, the edges of the tube blank melt and squeeze together.

Galvanization Process

Galvanization involves coating the surface of the steel pipe with a protective layer of zinc to prevent rust and corrosion. There are two primary methods of galvanization:

• Hot-Dip Galvanization: The steel pipe is dipped in molten zinc, forming a thick protective layer.
• Electro-Galvanization: A thinner, more uniform zinc coating is applied through an electroplating process.

Galvanization greatly improves the pipe's durability, especially in environments exposed to moisture, chemicals, or harsh weather conditions.

Key Features of ERW Galvanized Steel Pipe

• Corrosion Resistance: The zinc coating protects it from rust, making it suitable for outdoor and wet environments.
• Strength and Durability: ERW pipes have a strong weld seam, providing structural integrity in various applications.
• Cost-Effective: They offer long-term durability at a lower cost compared to other corrosion-resistant materials.
• Smooth Surface: The ERW process produces pipes with a smooth surface, ideal for applications requiring smooth fluid flow.

Applications of ERW Galvanized Steel Pipes

• Construction: Used in scaffolding, structural frames, fences, and handrails.
• Water and Gas Supply: Commonly used in plumbing systems for transporting water, gas, and other fluids.
• Automotive Industry: Used in the manufacturing of automotive components and exhaust systems.
• Agriculture: Used in irrigation systems, greenhouse structures, and fencing for farms.
• Electrical Conduits: Used as conduits for electrical wiring, protecting against damage and corrosion.

Sizes and Specifications

ERW galvanized steel pipes come in various sizes, thicknesses, and lengths, depending on the application. Standard sizes range from small-diameter pipes for plumbing and electrical work to large-diameter pipes for industrial applications.

Advantages

• Long Lifespan: The protective zinc coating ensures the pipe lasts longer in harsh environments.
• Easy to Install: Lightweight and easy to handle, they can be installed quickly with standard tools.
• Low Maintenance: The zinc coating reduces the need for regular maintenance, saving time and costs.
• Environmentally Friendly: Galvanized pipes are recyclable, making them an eco-friendly choice.

Conclusion

ERW Galvanized Steel Pipes are a versatile, durable, and cost-effective solution for various industrial, commercial, and residential applications. Their excellent corrosion resistance, strength, and ease of installation make them a preferred choice in industries such as construction, agriculture, and plumbing.

For pipes or tubes size 4 inch (10.2mm) OD and below, strip is fed into a set of forming rolls which consists of horizontal and vertical rollers so placed as to gradually from the flat strip in to a tube which is then allowed to pass the welding electrodes. The electrodes are copper disks connected to the secondary of a revolving transformer assembly. The copper disk electrodes make contact on each side of the seam and temperature is raised to the welding point. Outside flash is removed by a cutting tool as the tube leaves the electrodes, inside flash is removed either by an air hammer or by passing a mandrel through the welded tube after the tube has been cooled. This is termed as Electric Resistance Welded or ERW tube/pipe.

Steel Pipes manufacturers and Exports huge range of ERW Galvanized Steel Tubes & Steel Pipes. For pipes or tubes size 4 inch (10.2mm) OD and below, strip is fed into a set of forming rolls which consists of horizontal and vertical rollers so placed as to gradually from the flat strip in to a tube which is then allowed to pass the welding electrodes. The electrodes are copper disks connected to the secondary of a revolving transformer assembly. The copper disk electrodes make contact on each side of the seam and temperature is raised to the welding point.

Outside flash is removed by a cutting tool as the tube leaves the electrodes, inside flash is removed either by an air hammer or by passing a mandnel through the welded tube after the tube has been cooled. This is termed as Electric Resistance Welded or ERW tube/pipe.

Welded pipes specification and size