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Method for welding hollow static blade body and inner cavity supporting board of turbine

A hollow vane and welding method technology, applied in turbines, welding equipment, mechanical equipment, etc., can solve the problem of inability to reliably weld the hollow vane body and the folded shape support plate, and achieve the purpose of avoiding welding defects and improving comfort. Effect

Active Publication Date: 2014-03-26
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the present invention provides a welding method between the hollow stator body and the inner cavity support plate of a steam turbine, which can solve the problem that the current resistance spot welding method cannot reliably weld the hollow stator body and the folded shape support plate question

Method used

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  • Method for welding hollow static blade body and inner cavity supporting board of turbine
  • Method for welding hollow static blade body and inner cavity supporting board of turbine
  • Method for welding hollow static blade body and inner cavity supporting board of turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Firstly, conduct bottom welding on the tapered plug welding hole d, using pure argon gas with a purity of ≥99.99% as the shielding gas, the flow rate of the argon gas is 12L / min, the welding current is 90 A, the welding voltage is 13V, and the wire feeding speed is 13mm / min , 308LSi (ISO 14343-B) welding wire with a diameter of Φ1.0 is used for bottom filling, and less welding wire is sent when making bottom, and the root is penetrated;

[0037] Then plug welding the conical plug welding hole after backing welding until the conical plug welding hole is filled. During plug welding, 308LSi (ISO 14343-B) welding wire with a diameter of Φ2.0 is used for plug welding. The welding current is 110A, the welding voltage is 12 V, pure argon with a purity of ≥99.99% is used as the shielding gas, and the argon flow rate is 12L / min;

[0038] When repairing the defective part, use an argon arc welding torch to repair the defective part, repair welding current: 140A, repair welding vo...

Embodiment 2

[0040] Firstly, conduct bottom welding on the tapered plug welding hole d, using pure argon gas with a purity of ≥99.99% as the shielding gas, the flow rate of the argon gas is 12L / min, the welding current is 100A, the welding voltage is 12 V, and the wire feeding speed is 20mm / min , 308LSi (ISO 14343-B) welding wire with a diameter of Φ1.2 is used for bottom filling, and less welding wire is sent during bottoming, and the root is penetrated;

[0041] Then plug welding the conical plug welding hole after backing welding until the conical plug welding hole is filled. During plug welding, 308LSi (ISO 14343-B) welding wire with a diameter of Φ2.0 is used for plug welding. The welding current is 120A, the welding voltage is 13V, and the pure argon gas with a purity of ≥99.99% is used as the shielding gas, and the flow rate of the argon gas is 12L / min;

[0042]When repairing the defective part, use an argon arc welding torch to repair the defective part, repair welding current: 130...

Embodiment 3

[0044] Firstly, conduct bottom welding on the tapered plug welding hole d, using pure argon gas with a purity of ≥99.99% as the shielding gas, the flow rate of the argon gas is 12L / min, the welding current is 95A, the welding voltage is 14V, and the wire feeding speed is 5 mm / min , 308LSi (ISO 14343-B) welding wire with a diameter of Φ1.0 is used for bottom filling, and less welding wire is sent when making bottom, and the root is penetrated;

[0045] Then plug welding the conical plug welding hole after backing welding until the conical plug welding hole is filled. During plug welding, 308LSi (ISO 14343-B) welding wire with a diameter of Φ2.0 is used for plug welding. The welding current is 100 A ~ 120A, the welding voltage is 12 V ~ 14V, and the pure argon gas with a purity of ≥99.99% is used as the shielding gas, and the flow rate of the argon gas is 12L / min;

[0046] When repairing the defective part, use an argon arc welding torch to repair the defective part, repair weld...

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Abstract

The invention provides a method for welding a hollow static blade body and an inner cavity supporting board of a turbine. The method can solve the problem that the hollow static blade body and a folded supporting board can not be reliably welded through an existing resistance spot welding method. The method for welding the hollow static blade body and the inner cavity supporting board of the turbine is characterized in that a hollow static blade and the inner cavity supporting board are assembled in the finished product positions, the hollow static blade body and the inner cavity supporting board of the turbine are welded through a plug welding connecting method, and the method comprises the following steps of (1) before-welding preparation, (2) plug welding, (3) after-welding inspection and (4) repair welding, wherein in the before-welding preparation step, plug welding grooves are formed in position where an inner arc board of the hollow static blade is welded to the inner cavity supporting board, the grooves are then cleaned, and an oxide layer or a re-melting layer, oil dirt and dirt on the surface of each groove are removed; in the plug welding step, argon tungsten-arc welding is used for backing welding, root penetration is guaranteed, the portions, above the backing welding positions, of the grooves are filled until the grooves are full.

Description

technical field [0001] The present invention relates to the production technology field of steam turbine hollow stator blades, in particular to the production technology field of steam turbine hollow stator blades with folded support plates installed in the inner cavity, specifically a welding method for the steam turbine hollow stator blade body and the inner cavity support plate . Background technique [0002] Hollow vane with internal cavity with support plates in folded shape (see figure 1 , figure 2 and image 3 ) During operation, the support plate plays a role in reducing deformation and vibration. In the manufacturing process, the hollow stator body and the folded support plate are generally connected by resistance spot welding. However, due to the narrow working space in the inner cavity of the hollow stator, the spot welding torch often cannot be inserted into the inner cavity of the hollow stator for welding. Operation, so that the hollow stator body and the ...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/235
CPCB23K9/02B23K9/167B23K9/235B23K31/125B23K2101/001
Inventor 毛志刚王烜烽刘永骏苏化冰
Owner WUXI TURBINE BLADE
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