CN103808467A - Turbine mechanical fly ball laser sealing welding seam inspection method - Google Patents

Turbine mechanical fly ball laser sealing welding seam inspection method Download PDF

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Publication number
CN103808467A
CN103808467A CN201310526935.9A CN201310526935A CN103808467A CN 103808467 A CN103808467 A CN 103808467A CN 201310526935 A CN201310526935 A CN 201310526935A CN 103808467 A CN103808467 A CN 103808467A
Authority
CN
China
Prior art keywords
solvent
welding seam
fly ball
gas
liquid
Prior art date
Application number
CN201310526935.9A
Other languages
Chinese (zh)
Inventor
董太宁
陆成虹
施彧翰
马利江
谢龙
陆汉军
王樟水
Original Assignee
杭州汽轮机股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 杭州汽轮机股份有限公司 filed Critical 杭州汽轮机股份有限公司
Priority to CN201310526935.9A priority Critical patent/CN103808467A/en
Publication of CN103808467A publication Critical patent/CN103808467A/en

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Abstract

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

The method of steam turbine machinery flyball package sealing with laser welding line check
Technical field
The present invention relates to the method for mechanical flyball (primary and secondary flyball) the package sealing with laser welding line check of a kind of nuclear power auxiliary feedwater pneumatic pump steam turbine.
Background technology
Nuclear power auxiliary feedwater pneumatic pump uses the flyball of steam turbine in aqueous medium, the sensitivity in order to ensure flyball in working environment, and flyball adopts primary and secondary flyball structure.Female flyball and cap need adopt package sealing with laser weldering.The lossless detection method of routine inspection weld seam is subject to the limitation of detection method self and the impact of the design feature of part, cannot meet mechanical flyball package sealing with laser weldering examination requirements.
Summary of the invention
The object of the invention is the deficiency in order to solve above-mentioned technology and provide one to check quickly and efficiently sealed chamber's sealing, the method for steam turbine machinery flyball package sealing with laser welding line check.
In order to achieve the above object, the method that the designed steam turbine machinery flyball package sealing with laser welding line of the present invention is checked, is characterized in that carrying out according to the following steps:
A) by the cured solid liquid solvent that is molten into, and keep the liquid phase state of solvent;
B) the mechanical flyball that completes seal weld is immersed in liquid solvent completely, the time of submergence is no less than 3 minutes;
C) check whether mechanical flyball seal weld commissure has bubble to overflow.
Further method for optimizing is, in the time of step b, keeping the temperature of liquid wax solvent is 72 ℃-80 ℃.
The method of steam turbine that the present invention obtains machinery flyball package sealing with laser welding line check, based on following principle:
Known based on the Ideal-Gas Equation, there is following relation in pressure, volume and the temperature three of ideal gas:
pV∝T
Because mechanical flyball is steelwork, its first expansion coefficient is 10 -6/ K level, is increased to 72 ℃ from room temperature (being assumed to 25 ℃), and its volume change can be ignored, and the temperature of closed chamber indoor gas and the pass of pressure are:
p∝T
Heat by mechanical flyball being immersed in completely in the cured solvent of fusing, make the gas heating in flyball airtight chamber, because airtight chamber's volume is substantially constant, cavity indoor pressure raises.By setting up flyball airtight chamber internal high pressure, the pressure difference that outside normal (low) presses, check weld seam.In the time that weld seam exists defect (blow-by), internal gas is overflowed by fault location because of pressure reduction.Because the solubleness of gas gas in the cured solvent of liquid state is low, be subject to the capillary effect of cured solvent, in airtight chamber, escaping gas cannot be overflowed from cured solvent, is air bubble-shaped on weld defect surface.Inspection commissure bubble can be checked weldquality.
Accompanying drawing explanation
Fig. 1 fills cured solvent 2 by solid to be placed into the view in container 1.
Fig. 2 is to liquid body and keep the view of temperature by cured solid solvent heat fused.
Mechanical flyball 3 is immersed in view in liquid cured solvent by Fig. 3.
Embodiment
Below by embodiment, the invention will be further described by reference to the accompanying drawings.
Embodiment 1:
As shown in Figure 1-Figure 3, the method for the steam turbine machinery flyball package sealing with laser welding line check that the present embodiment is described, carry out according to the following steps:
A) cured solid solvent 2 is put into container 1, and be molten into liquid solvent, keeping the temperature of liquid wax solvent is 72 ℃
-80℃。
B) the mechanical flyball 3 that completes seal weld is immersed in liquid solvent completely, the time of submergence is no less than 3 minutes;
C) check whether mechanical flyball seal weld weld seam 4 places have bubble to overflow.

Claims (2)

1. a method for steam turbine machinery flyball package sealing with laser welding line check, is characterized in that carrying out according to the following steps:
A) by the cured solid liquid solvent that is molten into, and keep the liquid phase state of solvent;
B) the mechanical flyball that completes seal weld is immersed in liquid solvent completely, the time of submergence is no less than 3 minutes;
C) check whether mechanical flyball seal weld commissure has bubble to overflow.
2. the method for steam turbine machinery flyball package sealing with laser welding line according to claim 1 check, is characterized in that
In the time of step b, keeping the temperature of liquid wax solvent is 72 ℃-80 ℃.
CN201310526935.9A 2013-10-30 2013-10-30 Turbine mechanical fly ball laser sealing welding seam inspection method CN103808467A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310526935.9A CN103808467A (en) 2013-10-30 2013-10-30 Turbine mechanical fly ball laser sealing welding seam inspection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310526935.9A CN103808467A (en) 2013-10-30 2013-10-30 Turbine mechanical fly ball laser sealing welding seam inspection method

Publications (1)

Publication Number Publication Date
CN103808467A true CN103808467A (en) 2014-05-21

Family

ID=50705561

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310526935.9A CN103808467A (en) 2013-10-30 2013-10-30 Turbine mechanical fly ball laser sealing welding seam inspection method

Country Status (1)

Country Link
CN (1) CN103808467A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105206315A (en) * 2015-09-09 2015-12-30 中广核核电运营有限公司 Overhauling method for nuclear power station main pump seal chamber
CN108425808A (en) * 2018-03-08 2018-08-21 江苏金风科技有限公司 Method and system for the detection of wind generator set blade hole

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754832A (en) * 1980-09-19 1982-04-01 Hitachi Ltd Airtight inspection
JPS57141528A (en) * 1981-02-26 1982-09-01 Mitsubishi Heavy Ind Ltd Leakage inspecting method
CN87106017A (en) * 1987-08-29 1988-04-06 哈尔滨工业大学 Encapsulation parts small opening detects screening method and device
JPH06300655A (en) * 1993-04-19 1994-10-28 Nippon Steel Corp Airtightness testing method
CN202471545U (en) * 2012-03-23 2012-10-03 辽宁石油化工大学 Weld deposited metal diffusible hydrogen tester
CN203224338U (en) * 2013-04-28 2013-10-02 上海聚东新能源科技有限公司 Apparatus for detecting seal performance of weldment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754832A (en) * 1980-09-19 1982-04-01 Hitachi Ltd Airtight inspection
JPS57141528A (en) * 1981-02-26 1982-09-01 Mitsubishi Heavy Ind Ltd Leakage inspecting method
CN87106017A (en) * 1987-08-29 1988-04-06 哈尔滨工业大学 Encapsulation parts small opening detects screening method and device
JPH06300655A (en) * 1993-04-19 1994-10-28 Nippon Steel Corp Airtightness testing method
CN202471545U (en) * 2012-03-23 2012-10-03 辽宁石油化工大学 Weld deposited metal diffusible hydrogen tester
CN203224338U (en) * 2013-04-28 2013-10-02 上海聚东新能源科技有限公司 Apparatus for detecting seal performance of weldment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105206315A (en) * 2015-09-09 2015-12-30 中广核核电运营有限公司 Overhauling method for nuclear power station main pump seal chamber
CN108425808A (en) * 2018-03-08 2018-08-21 江苏金风科技有限公司 Method and system for the detection of wind generator set blade hole
CN108425808B (en) * 2018-03-08 2020-03-17 江苏金风科技有限公司 Method and system for detecting blade pore of wind generating set

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Application publication date: 20140521

RJ01 Rejection of invention patent application after publication