Linear friction welded titanium alloy joints: a brief review of microstructure evolution and mechanical properties

Linear friction welding (LFW) is a solid-state welding technique that was developed for manufacturing and repairing titanium alloy bladed disks (blisks) for aircraft engines. Different titanium alloys have been welded successfully with this technique, but the understanding of the welding process is limited. In this article, a brief review of microstructure evolution and mechanical properties of titanium alloy joints produced with this technique is provided. The welding process and its application are introduced; then joint microstructure characteristics and texture distribution are described; followed by discussing of the relationship between mechanical properties and microstructure; conclusions and further research suggestions are given in the end.