TECHNOLOGY IN FOCUS
THE SUPERMATERIAL DELIVERING A NEW ERA IN WELDING INNOVATION
P
olycrystalline cubic boron nitride (PCBN) tooling is a transformative technology
in the application of Friction Stir Welding (FSW) for steel structures Matthew Hackett, Business Development – FSW, Element Six, provides an exclusive insight for us
1. What are the advantages of using PCBN technology in FSW? eg significant cost savings in production (include examples if possible) and reduced distortion in steel structures? Element Six (E6) Polycrystalline cubic
boron nitride (PCBN) tooling has emerged over the last 6 years as a transformative technology in the application of Friction Stir Welding (FSW) for steel structures. E6 PCBN tools offer a combination of extreme hardness, thermal stability, and wear resistance, making them particularly suitable for the high-temperature, high-load conditions encountered during the FSW of ferrous alloys. The company benefits from a legacy
of nearly 80 years of innovation, that has enabled the pioneering and development of market-leading PCBN solutions. These advanced materials are particularly well-suited for FSW
applications involving steel. E6’s Global Innovation Centre, located near Oxford, offers proprietary technology capabilities that allow our teams to design, develop, and manufacture tailored products, targeted to our customers’ requirements. One of the primary advantages of
E6’s PCBN tooling is its significantly extended tool life. Unlike conventional tool materials, PCBN exhibits minimal wear even under prolonged exposure to elevated temperatures and mechanical stresses. This durability translates into reduced tool replacement frequency, lower maintenance costs, and increased process uptime for the end user. For instance, in the European RESURGAM project, E6’s PCBN tools demonstrated consistent performance in welding thick steel plates for marine applications, contributing to more efficient and reliable shipbuilding processes. From a production cost perspective,
the use of PCBN tools ultimately results in substantial long-term savings. FSW, as a solid-state joining technique, offers significant energy efficiency advantages over conventional fusion welding methods. Unlike fusion welding, which requires melting of the base materials,
FSW operates below the melting point, thereby reducing thermal input and associated energy losses. Studies have shown that FSW can consume 60 to 80% less energy than traditional fusion welding processes, making it a more sustainable and cost-effective alternative for industrial applications (Akbari, Hassanzadeh, & Savaripour, 2025 Welding in the World. https://doi. org/10.1007/s40194-025-02120-4). Another strategic benefit is the
reduction in thermal distortion. Since FSW does not involve melting the base material, the heat input is significantly lower compared to conventional welding. This results in minimal residual stress and distortion, which is particularly advantageous in the fabrication of large steel structures, such as wind turbine towers and ship hulls. Improved dimensional accuracy reduces the need for post-weld straightening, further enhancing production efficiency. Additionally, PCBN FSW offers
environmental and safety benefits as well. The process eliminates the need for filler materials and shielding gases, reducing emissions and creating a cleaner working environment. The absence
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