Alternating　current　and　hot　wire　GMAW　process　is　a　kind　of　efficient　welding　process,　the　main　arc　of　which　is　the　traditional　GMAW　arc.　Under　the　action　of　AC　pulse　preheating　current,　the　filler　wire　can　flow　form　a　closed　loop　with　the　welding　pool　structure　in　the　base　metal.　The　current　flows　through　the　loop　to　generate　resistance　heat　to　preheat　the　filler　wire.　The　filled　wire　preheated　to　high　temperature　will　melt　rapidly　under　the　thermal　influence　of　the　liquid　metal　after　entering　the　molten　pool.　In　this　experiment,　the　high　efficiency　hot　wire　GMAW　process　was　studied.　The　study　found　the　matching　rules　among　the　parameters　such　as　the　preheating　current　of　the　filler　wire,　the　extension　length　of　the　filler　wire,　the　distance　between　the　filler　wire,　the　main　arc　welding　specification,　etc.　Finally,　it　was　realized　the　deposition　rate　above　20　kg/h.　Through　the　analysis　of　the　influence　rules　of　the　above　factors　on　the　deposition　efficiency,　the　results　show　that:　compared　with　the　traditional　welding　process,　hot　wire　GMAW　has　obvious　advantages　in　improving　the　deposition　rate　and　deposition　coefficient.　This　process　has　a　broad　application　prospect　in　the　field　of　high　strength　steel　thick　plate　welding.　Copyright　©　2021　Transactions　of　the　China　Welding　Institution.　All　rights　reserved.