Aluminum alloy medium plate T-shaped HV joint welding process method

The invention discloses a welding process method for a T-shaped HV connector of an aluminum alloy medium plate. The welding process method comprises the following steps that S1, a workpiece to be welded is subjected to oxidation film removal and preheating; s2, a four-step mode and a double-pulse mode are combined for welding; the step S2 specifically comprises the following steps that A, a welding machine and a shielding gas switch are turned on, and in an operation interface of the welding machine, a double-pulse mode is selected and set to be conducted; b, welding current is adopted for arcing and welding, and the position 10-15 mm away from the tail of a weld joint is welded through a double-pulse-mode current value; and C, arc suppression attenuation current is adopted at the arc suppression position for arc suppression welding. According to the method, a four-step mode and a double-pulse mode are combined, the defect that the welding quality of the arc suppression position and the surrounding weld joint