FSW TOOLFriction stir welding tool | NTK Ceramics

Contribute to the practical application of FSW in high softening temperature materials using ceramic materials and advanced technologies.

Advancements in ceramic technology within the cutting field have reached new heights. Our commitment is to provide groundbreaking value to the field of FSW.

High performance in friction stir welding of high-melting point metals, resulting in a substantial cost reduction compared to conventional tools.



  • High temperature high-strength silicon nitride provides both wear resistance and heat resistance at a high level.
  • The tool shape design suitable for the material to be welded and the stable balance of material properties enables welding of thick plates of 10 mm or more.
  • Due to our expertise in cutting tools, our production technology and manufacturing system allow us to achieve cost-effectiveness compared to PcBN and alloyed material tools.
Wear resistance Heat resistance Tool cost
High melting point alloy
( W, Co, Ni, Pt )
High melting point alloy
+ Carbide composite
Carbides ×
HSS × ×
PcBN ×
NTK Ceramics

Application Fields

  • Steel industry : Friction stir welding of thick steel plates
  • Automotive : High-tensile strength material increasingly used to reduce vehicle weight and improve safety Steel Plate Joining
  • Joining of dissimilar materials such as aluminum alloys and other light metals with ferrous metals


Tool Materials High Strength SiAlON Ceramics
Shank dia.

φ8, 10, 12, 16, 20mm

*Availability larger than φ20 mm is available, and production for sizes exceeding φ40 mm has been produced, upon request.

Case study

High-tensile steel
Welding method FSW ( Butt joint )
Jointed material Material SPFC980 ( High-tensile980MPa )
Thickness (mm) 1.2
Tool shape Shank Dia. (mm) φ6
Shoulder Dia. (mm) φ6
Probe Dia. (mm) φ3
Probe length (mm) 0.9
Welding conditions Rotation speed (min-1) 1000
Welding speed (mm/min) 100
Welding distance (mm) 850
Thick steel plate
Welding method FSW ( Butt joint )
Jointed material Material Low carbon steel
Thickness (mm) 15
Tool shape Shank Dia. (mm) φ37.5
Shoulder Dia. (mm) φ37.5
Probe Dia. (mm) φ18.5
Probe length (mm) 14.7
Welding conditions Rotation speed (min-1) 200
Welding speed (mm/min) 50
Welding distance (mm) 500

Overlap joining of SS400 and SUS304
Corrosion-resistant steel plate assumed work

Previously, SUS was sprayed onto steel to improve surface performance. Can be easily joined by FSW

Overlap joining of SS400 and SUS304
Overlap joining of SS400 and SUS304

S45C cooling pipe assumed workpiece

Before joining

Conventional method - Welding
FSW (friction stir welding)
Joining without melting the base material, with minimal post-joining deformation.

What is FSW (friction stir welding)?

FSW stands for Friction Stir Welding, a joining technique developed in the United Kingdom in 1991.
A cylindrical tool with a protruding tip is rotated at high speed and pressed against the jointed part of the material to be joined. The frictional heat generated by the tool softens the material to be joined, and the rotation of the tool causes it to flow plastically, resulting in a solid-phase joint. This is a solid-phase welding technique. Unlike arc welding and other forms of fusion welding, the joining process does not melt the materials to be joined. The advantage is that there is less deformation after joining and less strength loss in the joint due to grain refinement in the joint. This has the advantage that the strength of the joint is reduced due to the subdivision of crystal grains in the joint. In addition, the joining process is more energy-efficient than conventional joining methods. The joints can be joined with less energy consumption compared to conventional joining methods.


FSW Application

Currently, widely adopted joining technologies for aluminum alloys and materials with low softening temperatures are making strides in the manufacturing of vehicles like railroad cars and automobiles. In contrast, when it comes to iron/steel materials with high softening temperatures, the availability of tool materials with excellent high-temperature properties is limited, and existing tools are often very expensive. The scarcity of tool materials with superior high-temperature properties is a notable challenge in working with iron/steel materials with high softening temperatures.

NTK CUTTING TOOLS plays a pivotal role in advancing the practical application of Friction Stir Welding (FSW) to high softening temperature materials, leveraging its unparalleled expertise in ceramic materials and cutting-edge technologies.


Product video