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Narrow-gap MIG welding method of turbine nozzles

A welding method and steam turbine technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of long auxiliary production cycle, low efficiency, high cost of vacuum electron beam welding, and achieve shortened production cycle, good economic and social benefits , Improve the effect of welding quality

Inactive Publication Date: 2015-11-25
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of high vacuum electron beam welding cost, long production auxiliary cycle; manual electrode arc welding labor intensity, low efficiency, and provide a narrow gap MIG welding method for steam turbine nozzles

Method used

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  • Narrow-gap MIG welding method of turbine nozzles
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  • Narrow-gap MIG welding method of turbine nozzles

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specific Embodiment approach 1

[0017] Embodiment 1: This embodiment is a narrow-gap MIG welding method for a steam turbine nozzle, which is specifically completed according to the following steps:

[0018] 1. Preparation before welding: Machining the size of the welding groove of the nozzle group to obtain the nozzle group to be welded with the blunt edge of the groove of the part to be welded is 2±0.25 mm, and machining the welding groove size of the nozzle chamber to obtain the The blunt edge of the groove of the welding part is 2±0.25mm for the nozzle room to be welded, and the groove gap should be ≤1mm in the assembly state of the nozzle group to be welded and the nozzle room to be welded before welding;

[0019] 2. Cleaning before welding: clean the surface of the nozzle group to be welded and the nozzle chamber to be welded separately, remove rust, scale, paint, oil, emulsion and dirt, and obtain a clean nozzle group and a clean nozzle chamber;

[0020] 3. Assembly: Assemble the clean nozzle group to ...

specific Embodiment approach 2

[0026] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: in step 3, the clean nozzle group is assembled on the clean nozzle chamber, and the groove gap is 8 mm to 10 mm, and then fixed by spot welding to obtain Nozzles of steam turbines to be welded. Others are the same as the first embodiment.

specific Embodiment approach 3

[0027] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 4, the entire nozzle of the steam turbine to be welded is uniformly preheated from room temperature to 150-200°C to get the preheated steam turbine nozzle. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a narrow-gap MIG welding method of turbine nozzles, belongs to the field of welding of turbines, and in particular, relates to a turbine nozzle welding method of a large-thickness welding structure. The invention aims to solve the defects of high welding cost and long production auxiliary period in vacuum electronic beams and high labor intensity and low efficiency in manual shielded metal arc welding. The welding method comprises (1) preparation before welding, (2) obtaining of a clean nozzle set and a clean nozzle chamber through cleanness before welding, (3) obtaining of turbine nozzles to be welded through assembly, (4) obtaining of the preheated turbine nozzles through preheating, (5) obtaining of the welded turbine nozzles through welding, (6) obtaining of the post-heated and hydrogen-removed turbine nozzles through post-heating, and (7) completion of the narrow-gap MIG welding of the turbine nozzles through post-welding heat treatment. The welding method has the advantages of largely improving the nozzle welding quality, shortening the production period and gaining excellent economical and social benefits. The welding method is mainly applied to the narrow-gap MIG welding of the turbine nozzles.

Description

technical field [0001] The invention belongs to the field of steam turbine welding, and in particular relates to a welding method for a steam turbine nozzle of a large-thickness welding structure. Background technique [0002] The steam turbine nozzle is one of the important components in the structure of the steam turbine. Its operating temperature and pressure are relatively high, and its operating conditions are also relatively harsh. The conventional manufacturing method of the steam turbine nozzle is to adopt mosaic structure, the design idea is cumbersome and the structure is relatively complicated. With the rapid development of welding technology, domestic and foreign steam turbine manufacturers generally use vacuum electron beam, manual electrode arc welding and other welding methods to manufacture steam turbine nozzles. Although vacuum electron beam welding has the characteristics of high welding efficiency, it is inevitable that welding The auxiliary time is long,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235B23K33/00B23K35/38
CPCB23K9/173B23K9/235B23K33/00B23K35/383
Inventor 王广成张辰鸾任国峰李红
Owner HARBIN TURBINE