CN105364268A - Valve seat and valve body welding process - Google Patents
Valve seat and valve body welding process Download PDFInfo
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- CN105364268A CN105364268A CN201410386866.0A CN201410386866A CN105364268A CN 105364268 A CN105364268 A CN 105364268A CN 201410386866 A CN201410386866 A CN 201410386866A CN 105364268 A CN105364268 A CN 105364268A
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- welding
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Abstract
The invention relates to a valve seat and valve body welding process and specifically relates to a valve seat and valve body assembly welding process for a supercritical thermal power unit. The positive effect of multilayer welding is fully utilized; by utilizing multi-layer welding, the following layer has the effects of hydrogen removal and heat affected zone microstructure improvement on the previous layer. The method of relatively rapid welding of small welding current is used for controlling thermal input; thermal input of welding is strictly controlled; high-strength steel is relatively sensitive to thermal input of welding and excessive thermal input causes reduction of the toughness of a welding joint and reduces the anti-cracking performance. After-heat treatment is performed immediately after welding, so that the problem that cold cracks appear some time after welding is solved and the welding requirement is met. The welding process completely solves the problem of difficulty in welding of WB36 and F6a dissimilar steel, prevents post-welding cracking and can totally guarantee the welding quality.
Description
Technical field
The present invention relates to the welding procedure of a kind of valve seat and valve body, specifically relate to a kind of supercritical thermal power unit triple valve valve seat and valve body assembly welding welding procedure.
Background technology
China is one is the country of main primary energy with coal, and conventional thermoelectricity accounts for more than 70% of electric power installation.Along with unit is to high parameter maximization development, 600MW, 1000MW super (super-) critical fired power generating unit of energy-saving and environmental protection has become main force's unit of conventional thermoelectricity.Large-scale fire-electricity unit home-made equipment achieves impressive progress, boiler, steam turbine and generator three master greatly
Machine completely can autonomous Design, manufacture, but power plant auxiliary machine is weak link always, particularly high-end valve, is the equipment that in fired power generating unit, the magnitude of value is larger.
WB36 (i.e. 15NiCuMoNb5) adds NiCu-Mo alloy development to get up on the basis of carbon manganese steel, the feature of this steel is that intensity is high, yield limit is higher than 20 steel by 40%, serviceability temperature is 400 DEG C, also can be used as the heavily stressed pipeline that tube wall temperature reaches 500 DEG C, or be used as high parameter thermal power generation unit, as Sub-critical Parameter, supercritical parameter generating
The main feed water pipe of unit and cold section of reheating main steam pipe.This material is used for substituting the steel grades such as St45.8/ III, A106B, 20G, is the preferred material of high parameter thermal power generation unit.
WB36 is novel fine grain type high-strength steel, and its carbon equivalent is comparatively large, and weldability is general, and cold crack tendency is large.And WB36 and F6a is welding dissimilar materials, welding difficulty is large.Therefore must make rationally correct welding procedure and just can weld the product met the demands.
Summary of the invention
In view of prior art Problems existing, the object of the invention is will provide for difficult the asking of WB36 and F6a welding
Topic, proposes a kind of valve seat and valve body welding procedure, has reached the stability and reliability that improve welding, has improved and produce effect
The object of rate.
To achieve these goals, the technical solution adopted in the present invention is a kind of triple valve valve seat and valve body Welder
Skill, its technical process is:
1, the welding wire of ER90S-B9 is adopted;
2, the dirt near groove and groove is cleared up;
3, preheating: its temperature is 230 DEG C;
4, adopt multilayer welding welding, after multilayer, layer to disappear hydrogen to front layer, and controlling interlayer temperature lower than preheat temperature, can not control
Interlayer temperature is 200-250 DEG C;
5, heat input is controlled: the method adopting little welding current faster to weld controls heat input, and welding current is
220-240A, weldingvoltage is 13-15V, and speed of welding is 100-150mm/min;
6, inert gas shielding: gas flow is 10-15L/min;
7, after-baking: postwelding carries out after-baking immediately, described postheat temperature is 300 DEG C, is incubated as 1h.
8, heat treatment: described heat treatment temperature 630 ± 10 DEG C, is incubated at least 2h.
Described inert gas is preferably argon gas.
The invention has the advantages that: the Beneficial Effect making full use of multilayer welding, adopt multilayer welding, rear layer is to front
Layer has disappear hydrogen and the effect improving heat affected area tissue; The method adopting little welding current faster to weld controls heat input, sternly
Lattice control thermal weld stress, and high-strength steel is more responsive to thermal weld stress, and heat inputted conference makes welding point toughness decline, and reduce
Cracking resistance.Postwelding carries out after-baking immediately, prevents a period of time after welding from producing cold crack, thus satisfied welding is wanted
Ask.This welding procedure completely solves the welding of WB36 and F6a Dissimilar Steels and there is the difficult problem of welding, and avoids appearance weldering
The phenomenons such as rear cracking, can ensure weldquality completely.
Detailed description of the invention
A kind of valve seat and valve body welding procedure, its technical process is:
1, the welding wire of ER90S-B9 is adopted;
2, the dirt near groove and groove is cleared up;
3, preheating: its temperature is 230 DEG C;
4, adopt multilayer welding welding, after multilayer, layer to disappear hydrogen to front layer, and controlling interlayer temperature lower than preheat temperature, can not control
Interlayer temperature is 200-250 DEG C;
5, heat input is controlled: the method adopting little welding current faster to weld controls heat input, and welding current is
220-240A, weldingvoltage is 13-15V, and speed of welding is 100-150mm/min;
6, inert gas shielding: gas flow is 10-15L/min;
7, after-baking: postwelding carries out after-baking immediately, described postheat temperature is 300 DEG C, is incubated as 1h.
8, heat treatment: described heat treatment temperature 630 ± 10 DEG C, is incubated at least 2h.
Claims (2)
1. valve seat and valve body welding procedure, its technical process is:
(1) welding wire of ER90S-B9 is adopted;
(2) dirt near groove and groove is cleared up;
(3) preheating: its temperature is 230 DEG C;
(4) adopt multilayer welding welding, after multilayer, layer to disappear hydrogen to front layer, and controlling interlayer temperature can not lower than preheat temperature, between key-course
Temperature is 200-250 DEG C;
(5) heat input is controlled: the method adopting little welding current faster to weld controls heat input, and welding current is 220-240A, and weldingvoltage is 13-15V, and speed of welding is 100-150mm/min;
(6) inert gas shielding: gas flow is 10-15L/min;
(7) after-baking: postwelding carries out after-baking immediately, described postheat temperature is 300 DEG C, is incubated as 1h;
(8) heat treatment: described heat treatment temperature 630 ± 10 DEG C, is incubated at least 2h.
2. valve seat according to claim 1 and valve body welding procedure, is characterized in that: described inert gas is preferably argon gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410386866.0A CN105364268A (en) | 2014-08-08 | 2014-08-08 | Valve seat and valve body welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410386866.0A CN105364268A (en) | 2014-08-08 | 2014-08-08 | Valve seat and valve body welding process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105364268A true CN105364268A (en) | 2016-03-02 |
Family
ID=55367163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410386866.0A Pending CN105364268A (en) | 2014-08-08 | 2014-08-08 | Valve seat and valve body welding process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105364268A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110270744A (en) * | 2018-03-13 | 2019-09-24 | 江苏万恒铸业有限公司 | Mechanization gas metal-arc welding valve body connect Welding with valve seat |
| CN110524132A (en) * | 2019-08-01 | 2019-12-03 | 中广核核电运营有限公司 | Branch holder replaces weld industry system and method in thin-walled main pipe |
-
2014
- 2014-08-08 CN CN201410386866.0A patent/CN105364268A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110270744A (en) * | 2018-03-13 | 2019-09-24 | 江苏万恒铸业有限公司 | Mechanization gas metal-arc welding valve body connect Welding with valve seat |
| CN110524132A (en) * | 2019-08-01 | 2019-12-03 | 中广核核电运营有限公司 | Branch holder replaces weld industry system and method in thin-walled main pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160302 |
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| WD01 | Invention patent application deemed withdrawn after publication |