What Is an External Burr Scraper? Types, Benefits & Applications in Tube Mills

Mar . 31, 2026 14:01

In modern ERW tube and pipe production, surface quality is one of the key factors that determines product value. During the welding process, excess metal is squeezed out and forms burrs on the outer surface of the pipe.

This is where the external burr scraper becomes essential.

carbide inserts CNC steel pipe burr blade

What Is an External Burr Scraper?

An external burr scraper is a tool used in an ERW tube mill to remove the outer weld bead (external burr) formed during high-frequency welding.

After the strip edges are heated and pressed together, molten metal is squeezed out along the weld seam. If not removed, this burr will:

Affect pipe appearance
Interfere with downstream processing (galvanizing, coating, etc.)
Reduce product quality

👉 The scraper trims this excess material smoothly, ensuring a clean and uniform pipe surface.

Where Is It Used in a Tube Mill?

The external burr scraper is typically installed:

➡️ After the welding section
➡️ Before sizing or cooling section

Process flow:

Uncoiling → Forming → Welding → External Burr Removing → Cooling → Sizing → Cutting

Types of External Burr Scrapers

External burr scrapers come in different designs depending on pipe size, production speed, and precision requirements.

1. Four-Sided External Burr Scraper

🧩Features:

Uses 4 cutting edges
Simple structure
Easy to install and maintain

📝Advantages:

Cost-effective
Suitable for small to medium tube mills
Quick replacement

🔍Limitations:

Lower precision compared to multi-edge designs
More frequent tool changes

2. Six-Sided External Burr Scraper

🧩Features:

Equipped with 6 cutting edges
More stable cutting performance

📝Advantages:

Longer service life
Better surface finish
Higher efficiency for continuous production

🔍Best for:

Medium to high-speed production lines
Customers requiring better pipe surface quality

3. Multi-Edge / Adjustable Scraper Systems

🧩Features:

Adjustable tool holders
Replaceable inserts

📝Advantages:

High precision
Flexible for different pipe sizes
Reduced downtime

🔍Used in:

High-end tube mills
Automated production lines

What Does It Work With?

The external burr scraper does not work alone. It is part of a complete weld seam treatment system.

Commonly used together with:

1. Internal Burr Remover (Scarfing Tool)

Removes burr inside the pipe
Ensures smooth inner surface

2. HF Welder (High Frequency Welder)

Generates the weld seam where burr is formed

3. Sizing Mill

Final shaping after burr removal

4. Cooling System

Stabilizes pipe shape before further processing

👉 Together, these systems ensure both inner and outer weld quality.

Why Is External Burr Removal Important?

Using a high-quality external burr scraper helps to:

✔ Improve pipe appearance
✔ Ensure smooth downstream processing
✔ Reduce defects in coating or galvanizing
✔ Increase product value
✔ Meet international quality standards

How to Choose the Right External Burr Scraper?

When selecting a scraper, consider:

Pipe diameter range
Wall thickness
Production speed
Material type (carbon steel, stainless steel, etc.)
Required surface quality

👉 For high-speed lines, a six-sided scraper is usually the better choice.
👉 For cost-sensitive projects, a four-sided scraper is often sufficient.

Pervious

14 Inch 355mm API Tube Mill: Complete Guide to Structure and Production Process

Finding Reliable ERW Tube Mill Suppliers for Successful Projects

Related News

2026-08-13 10:50:44

Double Head Uncoiler for Tube Mills: Continuous Coil Loading and Faster Production

Double Head Uncoiler is an efficient coil feeding machine designed for ERW tube mills, pipe mills, and coil processing lines. With two hydraulic expanding mandrels, it allows one steel coil to run while the next coil is prepared, reducing coil changeover time and production downtime. The hydraulic drive provides stable and reliable coil unwinding, making the double head uncoiler an ideal solution for medium and large-size tube mills, heavy steel coils, and high-production applications.

2026-08-12 10:17:44

Buying a Steel Slitting Line? 8 Key Specifications You Should Know

Looking for a reliable Steel Slitting Line for your tube or pipe production? Our Coil Slitting Machine is designed to convert wide steel coils into accurate narrow strips for ERW Tube Mills, roll forming lines and other applications. From HR, CR and galvanized steel to different coil widths, thicknesses and weights, the slitting line can be customized to your requirements. ⚙️ Learn how to select the right slitting capacity, strip width, coil weight and production speed for your business.

2026-08-11 09:25:01

Conveyor and Run Out Table for ERW Tube Mill | Pipe Conveying & Discharge System

Conveyor and Run Out Table is an important pipe handling system in an ERW Tube Mill, mainly installed after the flying saw or cold saw. It supports, conveys, aligns, buffers, and discharges finished pipes smoothly to the next process. A properly designed run out table can reduce manual handling, protect pipe surfaces, and improve production efficiency. With customized roller layout, conveying speed, table length, and discharge design, it can be matched with different pipe sizes, production speeds, and downstream stacking or packing systems.

2026-08-10 10:07:47

3 Inch–5 Inch Tube Mill: The Most Popular Size Range for ERW Pipe Production

3–5 Inch ERW Tube Mill is one of the most popular choices for steel pipe manufacturers. This tube mill size range is widely used for producing round, square, and rectangular steel tubes for construction, machinery, furniture, automotive, and structural applications. With flexible tube diameter and wall thickness options, a 3 inch, 4 inch, or 5 inch tube mill can meet different production requirements. Learn how to choose the right ERW tube mill based on your products, target market, production speed, and future demand.

2026-08-06 09:50:37

Cold Roll Forming Machine with Punching: A Complete Guide for Custom Metal Profiles

A Cold Roll Forming Machine with Punching combines precision roll forming and automatic punching in one efficient production line. It can produce C channels, U channels, garage door struts, solar mounting profiles, and many other custom steel sections with round holes, slots, or special cutouts. The punching system improves production efficiency, reduces secondary processing, and ensures accurate hole positioning. AIS Machinery provides customized roll forming solutions based on your profile drawings and production requirements.

2026-08-05 09:48:14

Automatic vs Semi Automatic Shear and Welder: Which Coil Joining System Is Best for Your Tube Mill?

Our Automatic and Semi Automatic Shear and Welder systems are designed for reliable coil joining in ERW tube mills. Both machines use TIG welding technology to produce strong, smooth butt welds that pass easily through the accumulator and forming section. Whether you need a fully automated solution for high-volume production or a cost-effective semi automatic model, AIS Machinery offers customized systems to match different strip widths, thicknesses, and production capacities.

2026-08-04 11:10:21

Cold Saw for ERW Tube Mill: Why More Manufacturers Are Upgrading from Friction Saw

Flying Cold Saw is an advanced cutting solution for modern ERW tube mills, designed for continuous online pipe cutting with high accuracy. Driven by a servo system and controlled by PLC, it delivers smooth, burr-free pipe ends, low noise, and stable performance. Compared with traditional friction saws, Cold Saw improves product quality while reducing secondary processing. It is widely used for cutting round, square, and rectangular steel tubes in high-speed tube production lines.

2026-08-03 11:19:16

Steel Coil Cut to Length Line | CTL Machine Manufacturer

The Automatic Cut to Length Line provides an efficient solution for converting metal coils into finished sheets. Advanced servo feeding and hydraulic shearing ensure accurate cutting with smooth edges, while the automatic stacker keeps finished sheets neatly organized. Widely used in steel service centers, construction, automotive, and appliance industries, this CTL machine supports various materials and can be customized to meet specific production requirements, offering reliable performance and long service life.