Turbine mechanical fly ball laser sealing welding seam inspection method
A sealing welding and steam turbine technology, which is applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, etc., can solve the problems such as the inability to meet the inspection requirements of mechanical flyweight laser sealing welding
Inactive Publication Date: 2014-05-21
HANGZHOU STEAM TURBINE
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Problems solved by technology
The non-destructive testing method of routine inspection of welds is affected by the limitations of the testing method itself and the structural characteristics of the parts, and cannot meet the inspection requirements of mechanical flyweight laser sealing welding
Method used
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Embodiment 1
[0020] Such as Figure 1-Figure 3 As shown, the steam turbine mechanical flyweight laser seal welding seam inspection method described in this embodiment is carried out according to the following steps:
[0021] a) Put the solid wax solvent 2 into container 1 and melt it into a liquid solvent, keeping the temperature of the liquid wax solvent at 72°C
[0022] -80°C.
[0023] b) Completely immerse the mechanical fly hammer 3 that has completed seal welding in the liquid solvent, and the immersion time is not less than 3 minutes;
[0024] c) Check whether there are air bubbles overflowing at the 4 seams of mechanical fly hammer seal welding.
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The invention relates to a turbine mechanical fly ball laser sealing welding seam inspection method which is characterized by including the following steps: 1) melting solid wax into liquid solvent and keeping the liquid phase state of the solvent; b) completely immersing a mechanical fly ball finishing sealing welding into the liquid solvent with the immersing time no less than 3 minutes; c) checking whether bubbles are spilled from a mechanical fly ball sealing welding seam. According to the method, the mechanical fly ball is completely immersed into the molten wax solvent to be heated to enable the temperature of gas in a fly ball closed cavity to increase, and the welding seam can be inspected by building the pressure difference of the high pressure in the fly ball closed cavity and the external constant (low) temperature. When the welding seam has defects (not sealed), the internal gas escapes from the defect portion under the pressure difference. Due to the fact that the solubility of the gas in the liquid wax solvent is low, the gas escaping from the closed cavity cannot escape from the wax solvent under the effect of the surface tension of the wax solvent, and the gas are in the bubble shape on the surface of the welding seam defect.
Description
technical field [0001] The invention relates to a method for inspecting the laser seal welding seam of a mechanical flyweight (child-mother flyweight) of a steam turbine used in a nuclear power auxiliary water supply steam-driven pump. Background technique [0002] The flyweight of the steam turbine for the auxiliary feed water steam pump of nuclear power is in the water medium. In order to ensure the sensitivity of the flyweight in the working environment, the flyweight adopts the structure of the mother flyweight. The female flyweight and the cap shall be sealed by laser welding. The non-destructive testing method for routine inspection of welds is affected by the limitations of the testing method itself and the structural characteristics of the parts, and cannot meet the inspection requirements of mechanical flyweight laser sealing welding. Contents of the invention [0003] The object of the present invention is to provide a method for quickly and effectively inspecti...
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Inventor 董太宁陆成虹施彧翰马利江谢龙陆汉军王樟水
Owner HANGZHOU STEAM TURBINE
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