300MW heavy-duty gas turbine nozzle hula seal assembly welding restraining tool and use method

Abstract

The invention relates to the field of welding, in particular to a 300MW heavy-duty gas turbine nozzle hula seal assembly welding restraining tool and a use method. The 300MW heavy-duty gas turbine nozzle hula seal assembly welding restraining tool and the use method aim at solving the problems that a hula seal molded line and radian are changed due to the fact that the unrestrained end of a 300MWheavy-duty gas turbine nozzle hula seal is deformed to release welding tensile stress, and the follow-up assembly is influenced. The 300MW heavy-duty gas turbine nozzle hula seal assembly welding restraining tool is designed and manufactured and comprises a restraining force application part and a restraining belt, wherein the restraining belt is annular when working, one end of the restraining belt is connected with the restraining force application part, the other end of the restraining belt is tightened through the restraining force application part, the hula seal is forcibly restrained byusing the restraining tool all the time in the high-temperature alloy hula seal and nozzle assembling and welding process, the temperature difference of different positions disappears after welding iscompleted, after a certain welding stress is released, the restraining tool is removed, it is guaranteed that the free end of the hula seal does not have larger free deformation, it is further guaranteed that the molded line and radian of a product meet drawing and design requirements, and the subsequent combustion chamber assembling requirement is met.

Description

technical field [0001] The invention relates to the field of welding, in particular to a 300MW class heavy-duty gas turbine nozzle hula seal welding restraint tool and a use method. Background technique [0002] The nozzle of 300MW heavy-duty gas turbine is sealed with hula. The material is INCONEL X-750, and the localized alternative material is GH4145. The gaps, the whole circle at the bottom end are unrestricted and distributed in a circle. According to the design requirements of the 300MW heavy-duty gas turbine drawings, the hula seal needs to be connected with the nozzle in the form of interval welding, and the welding positions of the two sections are respectively located within 10mm of the edge of the gap of the hula seal structure, and the distance of the nearest circle is less than 4mm. Due to structural reasons , due to the influence of the welding temperature field during welding, under the action of uneven welding heat, the unrestrained end of the hula seal will...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In order to solve the problem that the unconstrained end of the hula seal of the 300MW heavy-duty gas turbine nozzle will deform itself to release the welding tensile stress, resulting in the change of the hula seal profile and arc, which does not meet the requirements of the drawings and affects the subsequent assembly. The invention proposes a 300MW class Heavy-duty gas turbine nozzle hula seal welding restraint tooling and its use

Images