The invention aims to provide an aluminum
alloy direct current plasma-
tungsten electrode argon arc
hybrid welding method based on pulse coordination control. A
tungsten electrode argon arc welding gun is exerted on one side of a
plasma arc welding gun, in the
welding process, the
tungsten electrode argon arc welding gun is utilized to remove oxidation films on the surface of aluminum
alloy in front of the
direct current plasma welding gun, and the
direct current plasma welding gun is utilized to conduct welding behind the
tungsten electrode argon arc welding gun. In order to avoid
electromagnetic interference between plasma arcs and
tungsten electrode argon arcs in the
welding process, when a plasma arc current is in a pulse basic value
pilot arc stage, a pulse
signal controller is triggered, and a
tungsten electrode argon arc current is adjusted to be in a negative
half wave crest value for removing the oxidation films on the surface of the aluminum
alloy; when the plasma arc current is in a pulse crest value welding stage, the pulse
signal controller is utilized to adjust the tungsten electrode argon arc current to be in pulse basic value output, and the steps are repeatedly executed in this way. According to the method, the
current pulse wave form of the tungsten electrode argon arcs and the
current pulse wave form of a plasma arc power supply are reasonably adjusted, the effect of cleaning the oxidation films on the surface of the aluminum alloy and
weld penetration are controlled, and therefore weld formation is guaranteed, tungsten electrode burning losses are reduced, and welding efficiency is improved.