During welded tube and pipe production, excess material can remain along the weld seam after the welding process. This excess material may be referred to as weld bead, weld flash, or weld burr.

Depending on the production requirements, the excess weld material may need to be removed from the inside or outside of the tube. This operation is commonly known as weld seam scarfing or weld seam deburring.

For continuous welded tube production, manufacturers may use different carbide tooling configurations for internal and external weld seam removal, including carbide scarfing rings, ID scarfing tools, OD scarfing inserts, roughing inserts, and customized carbide insert blanks.

The correct tool geometry and carbide grade depend on tube dimensions, tube material, weld seam condition, production parameters, and the existing tube mill.

What Is Weld Seam Deburring?

Weld seam deburring is the process of removing excess material, weld flash, weld bead, or burr from the weld seam of a welded tube or pipe.

After the tube is formed and welded, excess weld material can remain along the seam. Depending on the production requirements, it may need to be removed from:

-- The internal weld seam

-- The external weld seam

-- Both internal and external weld seams

In continuous tube production, the scarfing or deburring operation can be integrated into the production line.

The objective is not simply to remove excess weld material. Properly designed tooling should also support:

-- Consistent weld seam removal

-- Stable cutting performance

-- Controlled cutting forces

-- Consistent tube surface quality

-- Reliable tool life

Internal and External Weld Seam Deburring

The location of the weld seam determines the basic scarfing tool configuration.

Although both processes are used for weld seam removal, ID and OD scarfing require different tool structures and geometries.

Internal Weld Seam Deburring Tools

ID Scarfing for Welded Tube

Internal scarfing removes excess weld material from the inside surface of a welded tube or pipe.

Because the cutting tool operates inside the tube, the available working space is limited. The tool therefore needs to be accurately matched to the tube ID and internal weld seam.

A typical internal scarfing system may include:

-- Internal scarfing tool

-- Carbide scarfing ring

-- Ring holder

-- Support components

-- Positioning components

-- Other components according to the tube mill configuration

As the welded tube moves continuously through the production line, the carbide cutting edge engages the internal weld seam and removes excess material.

Carbide Scarfing Rings

A carbide scarfing ring is a cutting component designed for internal weld bead and weld flash removal.

The ring must be accurately manufactured according to the application because it operates within the limited internal space of the tube.

Important design considerations include:

-- Tube inside diameter

-- Ring dimensions

-- Wall thickness

-- Weld seam profile

-- Cutting profile

-- Clearance

-- Carbide grade

-- Edge preparation

-- Production conditions

The carbide ring should provide sufficient edge strength while maintaining effective cutting performance.

External Weld Seam Deburring Tools

OD Scarfing for Welded Tube

External scarfing removes excess weld material from the outside surface of welded tube and pipe.

A typical OD scarfing system may consist of:

-- Carbide scarfing insert

-- Scarfing tool holder

-- Scarfing head

-- Positioning components

The insert is positioned against the external weld seam. As the tube moves through the production line, the cutting edge continuously removes the excess weld material.

Compared with internal scarfing, external scarfing generally provides more accessible tooling space, but the cutting edge must still maintain stable contact with the weld seam.

Carbide Scarfing Inserts

A carbide scarfing insert is a replaceable cutting component used for external weld bead, weld flash, and burr removal.

Depending on the application, the insert geometry may be customized to match the weld seam profile and scarfing system.

Important parameters include:

-- Tube outside diameter

-- Wall thickness

-- Weld bead height

-- Weld bead width

-- Weld bead shape

-- Cutting profile

-- Clearance geometry

-- Edge preparation

-- Tool holder configuration

ID vs. OD Scarfing Tool Selection

Choosing the correct tool starts with identifying whether the application requires internal or external weld seam removal.

The tool should be selected based on the complete production condition rather than tube diameter alone.

Roughing Inserts for Heavy Weld Seam Removal

Some welded tube applications produce a relatively large or uneven weld bead that requires more aggressive material removal.

In these situations, a roughing scarfing insert may be used before a final scarfing or finishing operation.

A typical process may be:

Roughing → Final Scarfing / Finishing

Roughing operations generally require greater emphasis on:

-- Cutting edge strength

-- Carbide toughness

-- Resistance to mechanical loading

-- Stability under heavier cutting conditions

Finishing operations may place greater emphasis on:

-- Controlled weld material removal

-- Weld seam consistency

-- Surface quality

-- Cutting edge stability

The appropriate configuration depends on the weld seam condition and production requirements.

Indexable Scarfing Inserts

For suitable applications, scarfing inserts can be designed with multiple usable cutting edges.

When one cutting edge reaches its wear limit, the insert can be indexed to another cutting edge, depending on the insert and holder design.

Potential benefits include:

-- Simplified insert replacement

-- Reduced tooling change time

-- Better utilization of the carbide insert

-- Reduced production interruptions

The number of usable cutting edges depends on the insert geometry and scarfing system.

Carbide Grade Selection for Weld Seam Scarfing

Carbide grade selection is an important factor in weld seam deburring tool performance.

The carbide needs to provide a suitable balance between:

-- Wear resistance

-- Toughness

-- Edge strength

-- Impact resistance

-- Thermal stability

A carbide grade with higher wear resistance may be beneficial in abrasive conditions, while a tougher grade can provide better resistance to edge chipping under mechanical impact.

The final grade should be selected according to the actual tube material, weld seam condition, cutting load, production speed, and tool geometry.

MY46 Carbide Grade

MY46 is developed for weld seam removal applications requiring a combination of toughness and resistance to deformation under elevated-temperature conditions.

Key characteristics include:

-- Good toughness

-- Good impact resistance

-- Good resistance to deformation under elevated-temperature conditions

-- Suitable for selected small and medium-diameter welded tube applications

For selected applications, MY46 can be combined with an appropriate CVD coating to improve wear resistance and cutting stability.

MY75 Carbide Grade

MY75 is designed for applications requiring higher toughness under demanding operating conditions.

Key characteristics include:

-- High toughness

-- Good reliability

-- Good resistance to high-temperature wear

-- Suitable for selected medium and large-diameter welded tube applications

MY75 can also be combined with suitable coating technology according to application requirements.

MY46 vs. MY75

The final carbide grade should be confirmed according to actual production conditions rather than selected only according to tube size.

Cutting Edge Preparation for Scarfing Tools

The cutting edge of a weld seam scarfing tool needs to balance sharpness and edge strength.

A very sharp edge can reduce cutting resistance but may be more vulnerable to chipping when exposed to mechanical impact or unstable cutting conditions.

A stronger edge can improve resistance to chipping, but excessive edge preparation may affect cutting performance.

For this reason, edge preparation should be matched to:

-- Tube material

-- Weld bead condition

-- Cutting load

-- Tool geometry

-- Production speed

-- Carbide grade

Moresuperhard can optimize the cutting edge according to the specific scarfing application.

Common Weld Seam Deburring Problems

Burrs or Weld Material Remaining After Scarfing

Possible causes include:

-- Incorrect tool geometry

-- Incorrect tool positioning

-- Excessive tool wear

-- Variation in weld bead size

-- Insufficient cutting depth

The weld seam profile and cutting edge condition should be checked before changing the carbide grade.

Premature Edge Chipping

Possible causes include:

-- Insufficient carbide toughness

-- Excessive cutting load

-- Mechanical vibration

-- Unstable tool positioning

-- Unsuitable edge preparation

-- Weld bead variation

Potential solutions include selecting a tougher carbide grade, optimizing edge preparation, and improving tool positioning.

Rapid Scarfing Tool Wear

Possible causes include:

• Carbide grade not matched to the application

• High thermal loading

• Abrasive conditions

• Excessive cutting speed or load

• Unsuitable cutting geometry

Depending on the application, a different carbide grade, coating, or cutting geometry may improve tool life.

Scratches on the Tube Surface

Possible causes include:

• Chipped cutting edge

• Excessive insert wear

• Incorrect tool position

• Unsuitable insert geometry

• Damaged cutting edge

Inspection of the insert and scarfing setup can help identify the source of the surface defect.

Inconsistent Weld Seam Removal

Possible causes include:

• Weld bead variation

• Tool wear

• Incorrect positioning

• Insufficient tool rigidity

• Incorrect cutting profile

The welding process and scarfing system should be evaluated together because variations in the weld seam can directly affect cutting performance.

Customized Carbide Scarfing Tools for Welded Tube Production

Standard tooling can be suitable for many welded tube applications, but production conditions can vary significantly.

Differences in:

• Tube diameter

• Wall thickness

• Tube material

• Weld bead size

• Weld bead profile

• Production speed

• Cutting load

• Existing tube mill

• Tool holder configuration

can affect scarfing tool performance.

Moresuperhard provides customized carbide solutions for internal and external weld seam deburring.

Available solutions include:

• Carbide Scarfing Rings

• ID Scarfing Tools

• OD Scarfing Inserts

• Roughing Scarfing Inserts

• Customized Carbide Inserts

• Customized Carbide Insert Blanks

• Application-Specific Carbide Grades

• Customized Cutting Geometries

• Edge Preparation Solutions

• Coating Options

Customized Carbide Insert Blanks

For specialized scarfing insert designs, Moresuperhard can also provide customized carbide insert blanks.

Instead of starting from a completely standard carbide blank, a preformed blank can be produced closer to the required final geometry.

Depending on the design, this can reduce subsequent contour grinding and finishing requirements.

Customized carbide blanks can be developed according to:

• Customer drawings

• Existing insert samples

• Final insert geometry

• Required carbide grade

• Machining requirements

• Tool holder configuration

This solution can be useful when the required scarfing insert has a complex or application-specific profile.

Custom Weld Seam Deburring Tools for Tube and Pipe

Moresuperhard supplies customized carbide scarfing tools for internal and external weld seam deburring in welded tube and pipe production.

Our solutions include:

• Carbide Scarfing Rings

• ID Scarfing Tools

• OD Scarfing Inserts

• Roughing Inserts

• Customized Carbide Inserts

• Carbide Insert Blanks

• Application-Specific Carbide Grades

• Customized Cutting Geometries

To evaluate your application, please send us:

• Tube drawing or dimensions

• Tube material

• Wall thickness

• Weld bead dimensions

• Internal or external weld seam requirement

• Existing tooling drawing or sample

• Production conditions

Contact Moresuperhard for a customized carbide solution for internal and external weld seam deburring.