Argon tungsten-arc welding plate-shaped protective cover and tubular protective cover

The utility model relates to an argon tungsten-arc welding plate-shaped protective cover and a tubular protective cover, the plate-shaped protective cover is arranged on an argon tungsten-arc welding gun and used for welding a welding seam on a plate-shaped material, the plate-shaped protective cover comprises a plate-shaped main body, a hoop and an argon pipeline, the plate-shaped main body is of a square structure, and the hoop is arranged on the plate-shaped main body. Comprising a top wall, a left side wall, a right side wall and a rear wall, the left side wall, the right side wall and the rear wall are connected with three sides of the top wall respectively, an argon inlet is formed in the middle of the top wall, one end of an argon pipeline is connected with the argon inlet, the other end of the argon pipeline is connected with an argon input source, a groove matched with a hoop is formed in the front end of the plate-shaped body, and the hoop is connected into the groove. The hoop is also fixed on a po