The invention discloses an
inert gas shielded
welding process of an aluminum
alloy thick plate with the thickness being over 12 mm. The
inert gas shielded
welding process is characterized in that the process includes the following steps that (1) an aluminum
alloy portion to be welded is machined into a Y-shaped groove or a double-V-shaped groove, a butt-joint connector mode is adopted, the machined groove or the two side surfaces of the groove are polished and cleaned; (2) preheating before
welding is conducted on the aluminum
alloy plate to be welded, the preheating temperature ranges from 80 DEG C to 100 DEG C, the preheating time ranges from 3 minutes to 5 minutes, and the interpass temperature is controlled in the range of from 110 DEG C to 130 DEG C; (3)
inert gas shielded welding is adopted, and
welding process parameters are selected; an ER5356 welding wire with the
diameter being 4 mm is selected, the
arc voltage ranges from 20 V to 22 V, the current ranges from 140 A to 150 A, the welding speed ranges from 400 mm / min to 500 mm / min, and the gas flow ranges from 12 L / min to 15 L / min; (4) in the
welding process, a plurality of
layers and steps of welding are adopted, and then natural cooling is conducted after welding. By means of the
welding process, the welding process procedure can be conducted under the effective control, stability of the overall process and product quality can be guaranteed, the phenomenon of unqualified products is reduced, welding efficiency is high, and the
welding defect rate is low.