Fuel tank combined welding flexible positioning method

The invention discloses a fuel tank combined welding flexible positioning method, and relates to the technical field of automobile manufacturing. The fuel tank combined welding flexible positioning method comprises the following steps that A, a set of fuel tank combined welding flexible positioning fixture including four positioning units is manufactured; B, the position of four positioning holesof a fuel tank upper shell is used as a standard, and the position of each positioning unit is adjusted and fixed; C, a fuel tank lower shell is placed on support columns, and four positioning holes of the fuel tank lower shell are arranged on four positioning pins of the positioning units in a sleeving mode; D, the fuel tank upper shell is attached to the fuel tank lower shell, and circumferential rings of the joints of the fuel tank upper shell and the fuel tank lower shell are attached together; and E, rotary clamping cylinders drive pressing blocks to rotate inwards and press down againstflanges of the joints of t