CN102773622A - Welding method of chrome-molybdenum-series low-alloy steel sample used for drop test - Google Patents
Welding method of chrome-molybdenum-series low-alloy steel sample used for drop test Download PDFInfo
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Abstract
The invention discloses a welding method of a chrome-molybdenum-series low-alloy steel sample used for a drop test. The welding method comprises the following steps of: step one, preparing chrome-molybdenum-series low-alloy steel into a drop test sample, putting the drop test sample into a thermal treatment furnace, heating the drop test sample to 170-190 DEG C, and performing heat preservation; step two, overlaying low alloy surfacing welding electrodes on the surface of the sample at a welding speed of 125-145mm/min; and step three, arranging the welded sample on a steel plate at the temperature of 15-20 DEG C, and air-cooling the welded sample to the room temperature. According to the welding method, the effectiveness of the drop test can be ensured, meanwhile; bead cracks can be prevented from occurring and the test error is reduced in the welding process; and the test result can truly reflect the RTNDT of materials, so that the test result can reflect the performance of the materials truly, and further, the reliability of the drop test and the accuracy of the test result are ensured.
Description
Technical field
The present invention relates to a kind of welding method of low-alloy steel, be specifically related to a kind of welding method that is used for the chrome molybdenum series low-alloy steel sample of drop weight test.
Background technology
The heap type nuclear power station that China's autonomous Design is made, its nuclear island primary device in-pile component changes chrome molybdenum low-alloy steel forging into compared to the stainless steel forgings in the pressurized-water reactor nuclear power plant.Because document rarely has the drop weight test that shows this type of material, therefore be necessary drop weight test further investigation to this material.
Drop weight test; Full name is the nil-ductility temperature drop weight test method of ferritic steel; Comparing to the maximum difference of other mechanical test method is: welding bead of specimen surface built-up welding that need be under regulatory specifications; And fluting, both making an experiment under the fixed temperature, thereby investigating the sensitiveness to crackle of material under this temperature.
Existing welding method is: select for use the ordinary low-alloy steel surfacing welding of 4～5mm, the electric current of 190～200A that sample is directly welded.The shortcoming of this welding method is: on the one hand, this method is bigger to the heat input of mother metal, is easy to generate bigger heat affected area; On the other hand, the tensile strength of chrome-molybdenum steel is higher, σ
b>=500MPa, hardenability is stronger, in welding process, is easy to generate crackle.
Therefore, adopt existing welding method that the chrome-molybdenum steel sample is implemented built-up welding, its result of the test can not be as the true RT of this material
NDT(benchmark nil-ductility temperature) therefore, is necessary to take the certain process measure to prevent the generation of this problem, thereby guarantees the reliability of result of the test.
Summary of the invention
Technical problem to be solved by this invention provides a kind of welding method that is used for the chrome molybdenum series low-alloy steel sample of drop weight test, and it can guarantee drop weight test result's reliability.
For solving the problems of the technologies described above, the technical solution of welding method that the present invention is used for the chrome molybdenum series low-alloy steel sample of drop weight test is:
May further comprise the steps:
The first step, the sample that drops hammer that chrome molybdenum series low-alloy steel is prepared into is put into heat-treatment furnace and is heated to 170～190 ℃; Insulation; Temperature retention time is 1h/20mm (the sample insulation of every 20mm thickness 1 hour).
The chrome molybdenum series low-alloy steel that is adopted is the 12Cr2Mo1 material.
Second step, adopt the low-alloy surfacing welding, carry out built-up welding at specimen surface, speed of welding is 125～145mm/min;
Said low-alloy surfacing welding is a D127 type welding rod.
Said core diameter is 4mm, predetermined current 165A.Perhaps said core diameter is 5mm, predetermined current 180A.
In the 3rd step, the sample that welding is accomplished places 15～20 ℃ the steel plate sky to be chilled to room temperature.
The technique effect that the present invention can reach is:
The present invention can prevent to produce bead crack in the welding process when guaranteeing drop weight test validity, reduces test error, and its result of the test can truly reflect the RT of material
NDTThereby, make result of the test reflect the performance of material itself more realistically, to guarantee the reliability and the accuracy of experimental results of drop weight test.
The specific embodiment
The present invention is used for the welding method of the chrome molybdenum series low-alloy steel sample of drop weight test, may further comprise the steps:
The first step, the sample that drops hammer that chrome molybdenum series low-alloy steel is prepared into is put into heat-treatment furnace and is heated to 170～190 ℃; Insulation, temperature retention time are that the sample of every 20mm thickness is incubated 1 hour; Purpose is to reduce the cooling velocity of weld seam, prevents that welding bead from generating the brinelling tissue, cracking;
The specimen size of dropping hammer is generally 130 * 50 * 20mm, and then temperature retention time is 1 hour;
In second step, selecting diameter for use is low-alloy surfacing welding, the predetermined current 165～180A of 4mm or 5mm, carries out built-up welding at specimen surface, and speed of welding is 125～145mm/min (mm is a sample thickness);
The low-alloy surfacing welding is a D127 type welding rod;
Under the prerequisite that satisfies the drop weight test standard-required,, guarantee the character of mother metal own to reduce heat input as far as possible to material;
In the 3rd step, the sample that welding is accomplished places 15～20 ℃ the steel plate sky to be chilled to room temperature, reaches the purpose of material microstructure homogenising.
Chrome molybdenum series low-alloy steel can be the 12Cr2Mo1 material.
Adopt the prepared sample of the present invention, under the impact energy of 400J, survey the nil-ductility temperature test, the result is RT
NDT=-25 ℃.And the welding method that adopts prior art makes an experiment to the material of identical working condition, and the result is RT
NDT=-5 ℃.Therefore result of the test of the present invention is much higher than the result of the test of the welding method of prior art, has reduced test error.
Claims (6)
1. a welding method that is used for the chrome molybdenum series low-alloy steel sample of drop weight test is characterized in that, may further comprise the steps:
The first step, the sample that drops hammer that chrome molybdenum series low-alloy steel is prepared into is put into heat-treatment furnace and is heated to 170～190 ℃; Insulation;
Second step, adopt the low-alloy surfacing welding, carry out built-up welding at specimen surface, speed of welding is 125～145mm/min;
In the 3rd step, the sample that welding is accomplished places 15～20 ℃ the steel plate sky to be chilled to room temperature.
2. the welding method that is used for the chrome molybdenum series low-alloy steel sample of drop weight test according to claim 1, it is characterized in that: the temperature retention time of the said first step is 1h/20mm.
3. the welding method that is used for the chrome molybdenum series low-alloy steel sample of drop weight test according to claim 1, it is characterized in that: the chrome molybdenum series low-alloy steel that the said first step adopted is the 12Cr2Mo1 material.
4. the welding method that is used for the chrome molybdenum series low-alloy steel sample of drop weight test according to claim 1 is characterized in that: the low-alloy surfacing welding in said second step is a D127 type welding rod.
5. according to claim 1 or the 4 described welding methods that are used for the chrome molybdenum series low-alloy steel sample of drop weight test, it is characterized in that: the core diameter in said second step is 4mm, predetermined current 165A.
6. according to claim 1 or the 4 described welding methods that are used for the chrome molybdenum series low-alloy steel sample of drop weight test, it is characterized in that: the core diameter in said second step is 5mm, predetermined current 180A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110120725.0A CN102773622B (en) | 2011-05-11 | 2011-05-11 | For the welding method of the chrome molybdenum series low-alloy steel curved beam of drop weight test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110120725.0A CN102773622B (en) | 2011-05-11 | 2011-05-11 | For the welding method of the chrome molybdenum series low-alloy steel curved beam of drop weight test |
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| Publication Number | Publication Date |
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| CN102773622A true CN102773622A (en) | 2012-11-14 |
| CN102773622B CN102773622B (en) | 2015-08-19 |
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| CN201110120725.0A Active CN102773622B (en) | 2011-05-11 | 2011-05-11 | For the welding method of the chrome molybdenum series low-alloy steel curved beam of drop weight test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109202234A (en) * | 2018-11-28 | 2019-01-15 | 美钻深海能源科技研发（上海）有限公司 | A kind of method of F22 material ocean preventer shell Bead weld repair |
| CN111032266A (en) * | 2018-05-18 | 2020-04-17 | 日本制铁株式会社 | Welded structure |
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| EP1570944A1 (en) * | 2004-03-01 | 2005-09-07 | La Soudure Autogene Francaise | Coated electrode with low gas emission and low hexavalent chromium, for welding stainless steel |
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2011
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Patent Citations (3)
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| CN1108984A (en) * | 1995-01-19 | 1995-09-27 | 刘海英 | Repairing method for irregular holey workpieces |
| EP1570944A1 (en) * | 2004-03-01 | 2005-09-07 | La Soudure Autogene Francaise | Coated electrode with low gas emission and low hexavalent chromium, for welding stainless steel |
| CN101011785A (en) * | 2007-02-01 | 2007-08-08 | 北京工业大学 | Cr13 series overlay welding self-protection flux-cored wire |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111032266A (en) * | 2018-05-18 | 2020-04-17 | 日本制铁株式会社 | Welded structure |
| CN111032266B (en) * | 2018-05-18 | 2020-11-24 | 日本制铁株式会社 | Welded structure |
| CN109202234A (en) * | 2018-11-28 | 2019-01-15 | 美钻深海能源科技研发（上海）有限公司 | A kind of method of F22 material ocean preventer shell Bead weld repair |
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| CN102773622B (en) | 2015-08-19 |
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Effective date of registration: 20161123 Address after: 200245 Jiangchuan Road, Shanghai, No. 207, building 1800, No. Patentee after: Shanghai Electric Heavy Forging Co. Ltd. Patentee after: Shanghai Heavy Machines Plant Co., Ltd. Address before: 200245 Jiangchuan Road, Shanghai, No. 1800, No. Patentee before: Shanghai Heavy Machines Plant Co., Ltd. |