Mechanical vs Hydraulic Internal Scarfing Device

What Is an Inner Burr Removal Device?

The Inner Burr Removal Device (also called an Internal Scarfing Device or ID Burr Remover) is installed immediately after the high-frequency welding section. Its function is to accurately position the cutting knife inside the tube and continuously remove the internal weld bead during production.

Installation Position in an ERW Tube Mill

The scarfing device is positioned between the welding and cooling sections, where the weld bead is still hot and can be removed efficiently.

How Does Internal Scarfing Work?

After high-frequency welding, an internal weld bead forms along the seam of the pipe. The Inner Burr Removal Device places the knife precisely beneath the weld line and removes only the excess material while the tube moves continuously.

Working process:

1. The welded tube enters the scarfing station.

2. The knife is positioned inside the tube.

3. The internal weld bead is shaved off continuously.

4. The smooth tube proceeds to cooling and sizing.

This process improves the internal finish without affecting the wall thickness when correctly adjusted.

Mechanical vs Hydraulic Inner Burr Removal Device

The primary difference is how the knife is adjusted and maintained during production. Both systems perform the same function, but they are suitable for different production requirements.

Mechanical Inner Burr Removal Device

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

●Advantages

• Economical solution

• Simple operation

• Low maintenance cost

• Stable performance for standard production

●Recommended for

• Small and medium ERW tube mills

• Stable pipe specifications

• Lower production speeds

• Budget-conscious projects

Hydraulic Inner Burr Removal Device

The hydraulic type uses hydraulic cylinders to provide constant cutting pressure and more precise positioning. It is especially suitable for automatic production lines.

●Advantages

• Higher cutting stability

• Faster specification adjustment

• Better consistency at high speed

• Reduced operator intervention

●Recommended for

• High-speed tube mills

• Large diameter or thick-wall pipes

• Frequent size changes

• Higher quality surface requirements

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How to Choose the Right Model

Rather than choosing by price alone, consider your production conditions.

The Inner Burr Removal Knife is the consumable cutting tool installed on the scarfing device. It directly contacts the internal weld bead and determines the cutting quality of the finished pipe.

Main Features

• High wear resistance

• Precision ground cutting edge

• Stable cutting performance

• Easy replacement

• Suitable for carbon steel, GI steel, and stainless steel

Typical Specifications

The knife size can be customized according to the customer's tube mill model.

The Knife and Scarfing Device Are Matched Together

The Inner Burr Removal Knife is not selected independently. It must match the scarfing holder, support bar, cooling system, and tube mill design.

If you already have an existing tube mill, simply provide the machine model or scarfing device drawing, and the correct knife can be recommended.