This presentation will describe recent developments in the joining of Ti alloys using Linear Friction Welding (LFW). The talk will focus on the use of LFW to produce machining pre-forms for aerospace components. Currently, such components are usually machined out from solid blocks of Ti alloy, resulting in relatively poor material buy-to-fly ratios. The use of welded pre-forms can significantly reduce production costs for a range of these machined Ti parts.

Build up of machining pre-forms by LFW also provides the opportunity for selection of appropriate Ti alloys in different parts of the structure. This approach allows production of tailored components, resulting in both functional and economic benefits. Examples will be shown of the application of this approach to aerospace components, from simple two-piece LFW fabrications, to complex multiple-part pre-forms produced by sequential addition of material by LFW.

Selected results will be presented from a recent development programme on the LFW of Ti-6Al-4V machining pre-forms, which has been conducted by TWI Ltd. on behalf of The Boeing Company.

In summary this presentation will provide an overview of recent Linear Friction Welding development work aimed at improving product effectiveness and reducing production costs for a wide range of Ti alloy aerospace components.