Inner Scarfing Remove Device for ERW Tube Mill

The Inner Scarfing Remove Device is an essential accessory for an ERW Tube Mill, designed to remove the internal weld burr generated during high-frequency welding. Installed between the welding and sizing sections, it ensures a smooth inner surface while maintaining the pipe's dimensional accuracy.

For precision steel tubes, furniture tubing, automotive tubes, and mechanical pipes, internal burr removal greatly improves product quality and downstream processing performance

What Is an Inner Scarfing Remove Device?

During the ERW welding process, the squeezed molten metal forms burrs on both the outside and inside of the tube. While the outer burr is removed by an external scarfing tool, the inner burr requires a cutting tool that works inside the pipe.

The device uses a tungsten carbide insert mounted on a scarfing rod to continuously remove only the excess weld bead without reducing the designed wall thickness.

Main Functions

• ●Remove internal weld burr continuously

• ●Improve the inside surface finish

• ●Maintain accurate pipe dimensions

• ●Protect the sizing section and downstream equipment

• ●Meet higher-quality tube production requirements

Position in the Tube Mill

The inner scarfing unit is installed immediately after welding.

Removing the burr before the sizing section helps achieve better roundness, smoother internal surfaces, and more stable product quality.

Mechanical vs Hydraulic Inner Scarfing

The most important selection is choosing between Mechanical and Hydraulic types. The choice mainly depends on the pipe wall thickness and cutting force required.

✅Mechanical Inner Scarfing Device

The mechanical type uses a manual adjustment mechanism to position the cutting insert. Its structure is simple, reliable, and easy to maintain.

It is the standard choice for most light-wall ERW tube mills.

Recommended for:

• Wall thickness: 0.5–4.0 mm

• Carbon steel and galvanized steel tubes

• Standard production speeds

• Lower maintenance cost

Advantages:

• Simple mechanical structure

• Easy adjustment

• Economical solution

• Stable performance for thin-wall tubes

✅Hydraulic Inner Scarfing Device

The hydraulic type uses hydraulic pressure to control the cutting tool, providing much stronger and more consistent cutting force during production.

For thicker pipes, the internal weld bead becomes larger and harder, making hydraulic scarfing the preferred solution.

Recommended for:

• Wall thickness: Above 4.0 mm

• Heavy-wall ERW pipes

• High-strength steel materials

• Large diameter tube mills

Advantages:

• Powerful and stable cutting force

• Better performance on thick-wall pipes

• Higher cutting accuracy

• Suitable for continuous heavy-duty production

Mechanical vs Hydraulic Comparison

Inner Burr Removal vs Outer Burr Removal

Many customers ask whether both devices are necessary. The answer depends on the final pipe application.

Outer burr removal is almost standard on every tube mill, while inner burr removal is mainly selected for products requiring a clean internal surface.

How to Choose the Right Model

Instead of selecting by diameter alone, consider these four parameters.

1. Wall Thickness (Most Important)

2. Tube Diameter

The scarfing rod and tool holder are customized according to the pipe size.

3. Material

• Carbon Steel → Standard carbide insert

• GI Steel → Wear-resistant carbide

• Stainless Steel → Premium carbide grade

4. Production Speed

Higher production speeds require stronger tool rigidity and more precise alignment, especially for hydraulic systems on thick-wall production.

Typical Technical Parameters

The configuration is customized according to the customer's ERW tube mill.

Why Choose AIS Inner Scarfing Device?

AIS provides both Mechanical and Hydraulic Inner Scarfing Remove Devices compatible with various ERW tube mill models.

Features:

• Two configurations for different wall thicknesses

• Precision tungsten carbide cutting inserts

• Stable burr removal at high production speeds

• Easy tool replacement and maintenance

• Custom design for round, square, and rectangular tube mills

Our engineers will recommend the appropriate scarfing system based on your production requirements instead of offering a one-size-fits-all solution.

Information Required for Quotation

To select the correct model, please provide:

1. Tube diameter range

2. Wall thickness range

3. Material (CR, HR, GI, Stainless Steel)

4. Maximum production speed

5. ERW tube mill model

With these specifications, we can determine whether a Mechanical or Hydraulic Inner Scarfing Remove Device is the best solution for your production line.

FAQ

Should I choose mechanical or hydraulic inner scarfing?

If your maximum wall thickness is 4 mm or below, the mechanical type is generally sufficient. For wall thickness above 4 mm, the hydraulic type is recommended because it provides stronger and more stable cutting force.

Can the cutting insert be replaced?

Yes. The tungsten carbide insert is replaceable, allowing lower maintenance costs and shorter downtime.

Is inner scarfing necessary for every ERW tube mill?

No. Standard structural pipes may only require outer burr removal. Internal scarfing is mainly used for precision tubes, automotive tubing, furniture pipes, and other products requiring a smooth internal surface.

Can it be retrofitted to an existing tube mill?

Yes. Most existing ERW tube mills can be equipped with a customized inner scarfing device after confirming the tube size, wall thickness, and installation space.