Laser-induced　plume　affects　the　process　of　high-power　fiber　laser　welding.　The　effect　of　Tungsten　Inert　gas　(TIG)　arc　on　the　plume　characteristics　and　the　welding　results　are　investigated.　An　IPG　YLS-6000　fiber　laser　and　a　Fronius　MagicWave3000job　digital　welding　machine　are　used　in　the　experiment.　The　profile　of　the　plume　and　the　arc　plasma　are　recorded　by　a　high-speed　camera.　Furthermore,　the　weld　depth　and　weld　width　are　measured　by　a　microscope.　The　fundamental　law　of　TIG　arc　on　plume　induced　in　high　power　fiber　laser　welding　is　studied,　and　the　main　mechanism　of　this　effect　is　analyzed.　The　results　show　that,　the　weld　depth　of　hybrid　welding　significantly　increases　by　about　20%　compared　with　pure　fiber　laser　welding,　and　almost　isn＇t　affected　by　arc　current.　The　weld　width　gradually　improves　as　arc　current　increases.　The　weld　depth　and　weld　width　are　insensitive　to　the　distance　between　laser　and　arc　within　limits.　The　main　effect　of　TIG　arc　on　plume　is　the　gasification　of　the　particles　in　plume　by　high　temperature　TIG,　so　the　influence　of　plume　on　laser　beam　significantly　weakened.