The　correlation　between　three　welding　processes　and　joint　microstructure　as　well　as　properties　was　investigated　on　2219　aluminum　alloy　of　6　mm　thickness.　The　three　welding　processes　were　TIG　welding　with　filler　wire,　low-power　laser　assisted　TIG　hybrid　welding　and　laser　high-frequency　pulse　TIG　hybrid　welding　respectively.　The　results　showed　that,　compared　with　the　TIG　welding,　the　hybrid　welding　processe　could　improve　the　welding　speed,　reduce　the　heat　input　significantly,　refine　the　microstructure　of　the　joint,　and　reduce　the　width　of　eutectic　α　(Al)　+θ　(CuAl2),　especially　eliminate　the　porosities　of　fusion　zone　effectively.　Furthermore　both　the　joint　properties　and　stress　corrosion　resistance　were　improved　significantly.　The　average　fracture　time　for　2219　aluminum　alloy　through　the　laser　high-frequency　pulse　TIG　hybrid　welding　was　significantly　longer　than　that　through　the　TIG　welding,　which　was　about　93%　of　the　average　fracture　time　for　2219　base　material.