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A Welding Method for Steam Turbine Blow-Assembled Diaphragm Cascade

A welding method and steam turbine technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as difficulty in controlling the deformation of the diaphragm cascade, uneven heating, inconsistent thermal expansion and contraction, and reduce mutual influence. , reduce stress and deformation, increase the effect of structural rigidity

Active Publication Date: 2017-05-31
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the stator blades are densely arranged after mating, and the shape of the stator blades and the weld seam are asymmetrical structures, during the welding process, under the action of a heat source with highly concentrated energy, the heat will be uneven, and the thermal expansion and contraction of each part will be inconsistent, resulting in The eccentric stress field and strain field make it difficult to control the deformation of the diaphragm cascade

Method used

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  • A Welding Method for Steam Turbine Blow-Assembled Diaphragm Cascade
  • A Welding Method for Steam Turbine Blow-Assembled Diaphragm Cascade
  • A Welding Method for Steam Turbine Blow-Assembled Diaphragm Cascade

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Embodiment Construction

[0026] Such as Figure 1 to Figure 4 As shown in the figure, a welding method for steam turbine blow-fit diaphragm cascades includes two steps A and B: before step A is carried out, use a fixed pressing device 8 to press each stator blade 4 through the outer crown 5 and the inner crown 6 Tight, the inlet side 7 of the stator blade is downward. Argon arc welding is used for welding.

[0027] A. In order to increase the rigidity and dimensional stability of the clapboard cascade welding, the positioning welding of the stator blade 4 is performed manually, and the positioning welding position and sequence are as follows:

[0028] (1) Spot welding the first welding position 1 located at the center of both ends of the stator blade 4 can reduce the eccentricity of the centroid of the stator blade 4 and improve the dimensional stability;

[0029] (2) There is an inflection point in the structure of the second welding position, which is prone to stress concentration, and because thi...

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Abstract

The invention discloses a welding method for steam turbine brush-fitted diaphragm cascades, which includes two steps of positioning welding of stationary blades manually and reinforcing welding of the stationary blades with a robot; Symmetrical spot welding is performed at the first three welding positions; in the step of robot reinforcement welding, three welds of different positions and sequences are performed on the welds in the welding groove; by increasing the structural rigidity, reducing the eccentricity, and increasing the Structural symmetry reduces the mutual influence of each stator blade during welding, and achieves the purpose of reducing stress and deformation.

Description

technical field [0001] The invention relates to a steam turbine blow-fit baffle, in particular to a welding method for a steam turbine blow-fit baffle and cascade. Background technique [0002] Steam turbine diaphragm cascades are mainly divided into two types: shroud-type cascades and blow-fit cascades. Compared with shroud-type cascades, whisk-fit cascades have the advantages of simple assembly process, high assembly efficiency, and high dimensional accuracy. The separators of the first few stages of high and medium pressure have been widely used. [0003] In the welding process of the brush-fitted cascade, in order to increase the strength of the cascade, reduce the tendency of the cascade to extend cracks, and avoid the remanence generated on the non-steam path side of the brush-fitting joint, the welding process of the brush-fitting joint with open groove and wire filling is adopted. The design drawings and process require that the ellipticity after welding is ≤1mm, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16
CPCB23K9/0026B23K9/16
Inventor 匡清华王大勇张从平赵鹏飞舒学芳谭小平王喆罗军蒋超静古建杨建平黄丽宋渊何芬毛桂军宋永辉
Owner DONGFANG TURBINE CO LTD
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