Thanks　to　the　development　and　application　of　composite　material　reinforced　metal　based　components,　the　high　strength　and　lightweight　requirements　of　weapons　and　equipment　have　been　further　met.　Non-destructive　testing　for　detecting　interface　delaminations　between　dissimilar　materials,　as　well　as　identifying　internal　defects　within　each　material　layer,　is　an　important　means　to　ensure　equipment　quality　and　reliability.　This　paper　proposes　a　laser　ultrasonic　guided　wave　field　detection　and　imaging　method　for　identifying　defects　in　carbon　fiber-titanium　alloy　composite　gun　barrels.　The　method　involves　using　a　pulsed　laser　to　excite　ultrasonic　guided　waves,　scanning　the　gun　barrel,　receiving　wave　field　signals　through　a　piezoelectric　wafer,　and　imaging　defects　in　the　gun　barrel　based　on　frequency　domain　instantaneous　wavenumbers.　The　results　indicate　that　the　proposed　method　can　effectively　detect　and　locate　delamination　and　internal　defects　in　carbon　fiber-titanium　alloy　composite　materials.　©　2024　Published　under　licence　by　IOP　Publishing　Ltd.