Rudder system device assembling and welding method

The invention discloses a rudder system device assembling and welding method. The method includes A, completing the machining of a rudder stock and blade flange positioning post and a rudder pin seat conical hole; B, welding the blank of a rudder blade flange to the upper portion of a rudder blade; C, turning and milling the rudder flange upper end surface and positioning notch of the welded rudder blade and rudder blade flange; D, installing a rudder pin into the conical hole of a rudder pin seat, fixing the rudder pin to the lower portion of the rudder blade through a plurality of movable clamps, installing the rudder stock and blade flange positioning post in the positioning notch of the rudder blade flange of the rudder blade, and obtaining a pre-assembled rudder system device; utilizing a rudder system device welding tooling to weld the rudder system device. Compared with the prior art, the method has the advantages that the problem that the coaxiality of rudder stock, rudder blade and rudder pin of an existing rudder system device cannot meet the design requirements can be solved.