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Friction Stir Welding

Friction Stir Welding (FSW) was invented by Wayne Thomas at TWI Ltd in 1991 and overcomes many of the problems associated with traditional joining techniques. FSW is a solid state process which produces welds of high quality in difficult to weld materials such as aluminium and is fast becoming the process of choice for manufacturing light weight transport structures such as boats, trains and aeroplanes.

Fabricators are under increasing pressure to produce stronger and lighter products whilst using less energy, less environmentally harmful materials, at lower cost and more quickly than ever before. FSW, being a solid state, low energy input, repeatable mechanical process capable of producing very high strength welds in a wide range of materials, offers a potentially lower cost, environmentally benign solution to these challenges.

FSW was invented and pioneered by TWI Ltd and therefore we have a wide range of experience of applying the process industrially in addition to in-depth knowledge of the fundamental science underlying the process.

Process Overview

FSW is a solid-state joining process that creates high-quality, high-strength joints with low distortion and is capable of fabricating either butt or lap joints, in a wide range of materials thickness and lengths.

In the process a rotating FSW tool is plunged between two clamped plates. The frictional heat causes a plasticised zone to form around the tool. The rotating tool moves along the joint line. A consolidated solid-phase joint is formed.

FSW being a solid state process eliminates many of the defects associated with fusion welding techniques such a shrinkage, solidification cracking and porosity.

FSW Symposia
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Friction Stir Welding