Welding process of aluminum-magnesium alloy plate

The invention discloses a welding process of an aluminum-magnesium alloy plate. The welding process comprises the following steps of A, firstly, polishing a welding area of the aluminum-magnesium alloy plate to be welded, and then cleaning and drying; B, fixing the aluminum-magnesium alloy plate to be welded to a clamping mechanism, meanwhile, arranging the welding faces of the plate in an opposite mode and attaching, adjusting the position through an infrared gradienter, and enabling the upper surface and the lower surface of the plate to be located on the same horizontal plane; C, carrying out electromagnetic heating and preheating on the welding area of the aluminum-magnesium alloy plate; D, spraying active welding flux on the surface of a welding wire, and drying the welding wire; E, carrying out argon arc welding on the aluminum-magnesium alloy plate; F, rapidly cooling the welded aluminum-magnesium alloy plate; and G, finally, dismantling the clamping mechanism, and taking down the welded aluminum-magne