The　plate　butt　welding　tests　have　been　carried　out　to　the　2219　high-strength　aluminum　alloy　material　by　utilizing　the　self　development　compound　high　frequency　pulse　TIC　power　source,　whose　results　show　that　the　mechanical　properties　of　the　welding　seam　may　be　effectively　enhanced　by　adding　the　high　frequency　pulse　energy.　Therefore,　a　acoustic　emission　sensing　system　was　established　to　acquire　the　transmission　effect　of　the　high　frequency　pulse　arc　energy　during　the　welding　process;　moreover,　the　influence　on　the　welding　seam　microstructures　by　the　compound　high　frequency　pulse　energy　has　been　studied.　The　results　show　the　following　effects:　the　porosity　number　at　the　both　sides　of　the　welding　seam　fusion　line　may　be　decreased　significantly　by　adding　the　high　frequency　pulse　energy;　The　analysis　to　the　high　frequency　pulse　action　mechanism　has　been　carried　out　according　to　the　above　conclusions　to　provide　the　technology　theory　base　for　improving　and　enhancing　the　aluminum　alloy　welding　joint　performances.