Weathering steel U rib double-face welding full penetration welding method

The invention relates to a weathering steel U rib double-side welding full penetration welding method which comprises the following steps: 1, assembling and positioning a U rib and a top plate, and reserving an assembling gap; 2, welding joints between the two sides of the interior of the U rib and the top plate according to the welding parameters that I ranges from 360 A to 450 A, U ranges from 29 V to 34 V, the speed ranges from 380 mm/min to 430 mm/min, and flat welding is conducted; 3, the welded orthotropic plate is placed on a reversible deformation jig frame, the top plate is pressed and arched, and the reversible deformation jig frame is turned over to enable the dip angle of the top plate to be 25 degrees; 4, welding of an outer side welding seam is completed on the outer side of the U rib through submerged arc automatic welding, and the welding parameters are as follows: I is 560-650 A, U is 30-35 V, the speed is 480-560 mm/min, and 25-degree ship position welding is performed; and 5, the reversible