CN115401407A - Welding method capable of simultaneously ensuring strength and hardness of 40CrNiMoA welding line - Google Patents
Welding method capable of simultaneously ensuring strength and hardness of 40CrNiMoA welding line Download PDFInfo
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- CN115401407A CN115401407A CN202210917243.6A CN202210917243A CN115401407A CN 115401407 A CN115401407 A CN 115401407A CN 202210917243 A CN202210917243 A CN 202210917243A CN 115401407 A CN115401407 A CN 115401407A
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- 238000003466 welding Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000010791 quenching Methods 0.000 claims abstract description 48
- 230000000171 quenching effect Effects 0.000 claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000010953 base metal Substances 0.000 claims abstract description 13
- 238000005498 polishing Methods 0.000 claims abstract description 10
- 238000000137 annealing Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Arc Welding In General (AREA)
Abstract
The invention provides a welding method capable of simultaneously ensuring the strength and the hardness of a 40CrNiMoA welding seam, which is characterized in that the appearance of a product base material is processed, and a welding groove is formed on the welded end face; dividing a non-quenching area on the surface of the product base metal, wherein the rest area is a quenching area; quenching the quenching area on the surface of the product parent metal; measuring the flatness and the size of the parts of the base metal of the quenched product, and checking the hardness of each area; assembling a base material of a product to be butted, welding the welding groove by adopting a strength welding process, and forming a strength welding joint; after the strength welding joint is finished, carrying out local annealing heat treatment on the welding seam to eliminate welding residual stress; forming a hardness layer by using a surfacing process; polishing the surface of the welding seam; and (5) processing, sampling and detecting. The strength and the hardness of the 40CrNiMoA welding line are ensured.
Description
Technical Field
The invention belongs to the field of welding, and mainly relates to a welding method capable of simultaneously ensuring the strength and hardness of a 40CrNiMoA welding seam.
Background
At present, after steel rails adopted by astronomical telescope tracks are manufactured and processed in sections, high-strength bolts are adopted for riveting on site, the requirement on matching precision is high, the integrity is poor, and the observation precision is reduced after the astronomical telescope tracks are used for a long time. However, if the rail is manufactured by adopting a welding method and welded into a whole, the requirements that the Charpy V-notch impact value at the low temperature of-40 ℃ is more than or equal to 27J, the weld strength is more than or equal to 965Mpa, and the weld surface hardness is more than or equal to HRC45 cannot be met simultaneously because of the characteristics of the medium-carbon quenched and tempered steel 40CrNiMoA material.
Disclosure of Invention
The invention aims to provide a welding method capable of simultaneously ensuring the strength and hardness of a 40CrNiMoA welding line, which changes the manufacturing mode of an astronomical telescope track by selecting and matching a welding method and welding materials, realizes the requirements of simultaneously ensuring the strength and hardness of medium carbon quenched and tempered steel, reduces the cost and improves the precision.
In order to achieve the technical features, the invention is realized as follows: a welding method capable of simultaneously ensuring the strength and the hardness of a 40CrNiMoA welding line comprises the following steps:
the method comprises the following steps: processing the appearance of a product base material, and processing a welding groove on a welded end face;
step two: dividing a non-quenching area on the surface of the product base metal, wherein the rest area is a quenching area;
step three: quenching the quenching area on the surface of the product parent metal;
step four: measuring the flatness and the size of the parts of the base metal of the quenched product, and checking the hardness of each area;
step five: assembling a base material of a product to be butted, welding the welding groove by adopting a strength welding process, and forming a strength welding joint;
step six: after the strength welding joint is finished, carrying out local annealing heat treatment on the welding seam to eliminate welding residual stress;
step seven: forming a hardness layer by using a surfacing process;
step eight: polishing the surface of the welding seam;
step nine: and (5) processing, sampling and detecting.
The base material of the product is medium carbon quenched and tempered steel 40CrNiMoA material.
In the second step, the non-quenched area is not quenched in an area which is close to the welding seam and is within a reserved size A; and the non-quenching areas of the two butt-jointed base metals are symmetrically arranged.
The value of A is more than or equal to 100mm.
The value of A is 130mm.
In the quenching process of the quenching area in the third step, the induction quenching of the induction coil is adopted, so that the quenching hardness is ensured, and the protection of the non-quenching area is ensured.
And after quenching in the third step, ensuring that the HRC of the surface of a quenching area is 46-52 and the quenching depth is 6-8 mm.
In the process of the strength welding process in the fifth step, the adopted welding materials are welding materials which can completely meet the requirements of tensile strength, yield strength and-40 ℃ low-temperature impact value according to 40CrNiMoA base materials, and butt welding is completed to form the strength welding joint.
And the specific operation process in the seventh step is that a hard surfacing welding material is adopted to carry out surfacing welding on the weld joint and the non-quenching area range on the two sides, a polishing piece is used for polishing after surfacing welding is finished, and the hardness is detected.
The invention has the following beneficial effects:
1. by selecting and matching the welding method and the welding materials, the manufacturing mode of the astronomical telescope track is changed, the requirements of strength and hardness of medium-carbon quenched and tempered steel are met, the cost is reduced, and the precision is improved.
2. By the welding method, the surface quenching performance of 40CrNiMoA is met, the requirements of 40CrNiMoA strength and-40 ℃ low-temperature impact performance are met, the requirement that the surface hardness of a welding seam is consistent with the quenching surface hardness of a base metal is met, and the performance requirements of the strength and hardness of an astronomical telescope orbit are completely met.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a cross-sectional view of a weld of the present invention.
FIG. 2 is a top view of the weld of the present invention.
In the figure: the welding method comprises the following steps of 1 product base metal, 2 strength welding joints, 3 hardness layers, 4 non-quenching areas and 5 welding grooves.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-2, a welding method for simultaneously ensuring the strength and hardness of a 40CrNiMoA weld, comprises the following steps:
purchasing the product parent metal 1 and returning to the factory;
the product base metal 1 is made of medium carbon quenched and tempered steel 40 CrNiMoA;
the method comprises the following steps: processing the appearance of the product base metal 1, and processing a welding groove 5 on the welded end face;
step two: dividing a non-quenching area 4 on the surface of the product parent metal 1, wherein the rest area is a quenching area;
in the second step, the non-quenching area 4 is an area with a reserved size of 130mm close to the welding seam and is not quenched; and the non-quenched regions 4 of the two butt-jointed base metals 1 are symmetrically arranged.
Step three: quenching the quenching area on the surface of the product parent metal 1;
in the quenching process of the quenching area in the third step, the induction quenching of the induction coil is adopted to ensure the quenching hardness, and the protection of the non-quenching area 4 is paid attention to;
and after quenching in the third step, ensuring that the HRC of the surface of a quenching area is 46-52 and the quenching depth is 6-8 mm.
Step four: measuring the flatness and the size of the part of the quenched product base material 1, and checking the hardness of each area;
step five: assembling a product base metal 1 to be butted, welding a welding groove 5 by adopting a strength welding process, and forming a strength welding joint 2;
in the process of the strength welding process in the fifth step, the adopted welding materials are welding materials which can completely meet the requirements of tensile strength, yield strength and-40 ℃ low-temperature impact value according to 40CrNiMoA base materials, butt welding is completed, and the strength welding joint 2 is formed.
Step six: after the strength welding joint 2 is finished, carrying out local annealing heat treatment on the welding seam to eliminate welding residual stress;
step seven: forming a hardness layer 3 by using a surfacing process;
and the specific operation process in the seventh step is that a hard surfacing welding material is adopted to carry out surfacing welding on the weld joint and the non-quenched areas 4 on the two sides, a polishing piece is used for polishing after surfacing welding is finished, and the hardness is detected.
Step eight: polishing the surface of the welding line;
step nine: and (5) processing, sampling and detecting.
Claims (9)
1. A welding method capable of simultaneously ensuring the strength and the hardness of a 40CrNiMoA welding line is characterized by comprising the following steps:
the method comprises the following steps: processing the appearance of the product base material (1), and processing the welded end face to form a welding groove (5);
step two: dividing a non-quenching area (4) on the surface of the product base material (1), wherein the rest area is a quenching area;
step three: quenching a quenching area on the surface of the product base material (1);
step four: measuring the flatness and the size of a part of the quenched product base material (1), and checking the hardness of each area;
step five: assembling a product base metal (1) to be butted, welding a welding groove (5) by adopting a strength welding process, and forming a strength welding joint (2);
step six: after the strength welding joint (2) is finished, local annealing heat treatment is carried out on the welding seam to eliminate welding residual stress;
step seven: forming a hardness layer (3) by adopting a surfacing process;
step eight: polishing the surface of the welding seam;
step nine: and (5) processing, sampling and detecting.
2. The welding method for simultaneously ensuring the strength and the hardness of the 40CrNiMoA weld joint according to claim 1, characterized in that: the product base material (1) is made of medium carbon quenched and tempered steel 40 CrNiMoA.
3. The welding method for simultaneously ensuring the strength and the hardness of the 40CrNiMoA weld joint according to claim 1, characterized in that: in the second step, the non-quenched area (4) is not quenched in an area which is close to the welding seam and within a reserved size A; and the non-quenching areas (4) of the two butt-jointed base metals (1) are symmetrically arranged.
4. The welding method for simultaneously ensuring the strength and the hardness of the 40CrNiMoA weld joint according to claim 3, characterized in that: the value of A is more than or equal to 100mm.
5. The welding method for simultaneously ensuring the strength and the hardness of the 40CrNiMoA weld joint according to claim 3 is characterized in that: the value of A is 130mm.
6. The welding method for simultaneously ensuring the strength and the hardness of the 40CrNiMoA weld joint according to claim 1, characterized in that: in the quenching process of the quenching area in the third step, the induction quenching of the induction coil is adopted, so that the quenching hardness is ensured, and the non-quenching area (4) is protected.
7. The welding method for ensuring the strength and the hardness of the 40CrNiMoA welding seam at the same time according to the claim 1 or 6, characterized in that: and after quenching in the third step, ensuring that the HRC of the surface of a quenching area is 46-52 and the quenching depth is 6-8 mm.
8. The welding method for simultaneously ensuring the strength and the hardness of the 40CrNiMoA weld joint according to claim 1 is characterized in that: in the process of the strength welding process in the fifth step, adopted welding materials are selected according to a 40CrNiMoA base material, the requirements of the tensile strength, the yield strength and the-40 ℃ low-temperature impact value can be completely met, butt welding is completed, and the strength welding joint (2) is formed.
9. The welding method for simultaneously ensuring the strength and the hardness of the 40CrNiMoA weld joint according to claim 1, characterized in that: and the concrete operation process in the seventh step is that a hard surfacing welding material is adopted to carry out surfacing welding on the welding seam and the range of the non-quenching areas (4) on the two sides, a polishing piece is used for polishing after surfacing welding is finished, and the hardness is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210917243.6A CN115401407A (en) | 2022-08-01 | 2022-08-01 | Welding method capable of simultaneously ensuring strength and hardness of 40CrNiMoA welding line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210917243.6A CN115401407A (en) | 2022-08-01 | 2022-08-01 | Welding method capable of simultaneously ensuring strength and hardness of 40CrNiMoA welding line |
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| CN115401407A true CN115401407A (en) | 2022-11-29 |
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| CN202210917243.6A Pending CN115401407A (en) | 2022-08-01 | 2022-08-01 | Welding method capable of simultaneously ensuring strength and hardness of 40CrNiMoA welding line |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053024A (en) * | 2009-10-30 | 2011-05-11 | 中国石化集团第十建设公司 | Method for manufacturing test piece of hgdrogen induced cracking (HIC) and sulfide stress cracking (SSC) of welding material melting laid metal |
| CN103192236A (en) * | 2012-08-02 | 2013-07-10 | 上海振华重工集团（南通）有限公司 | Wharf ship loader telescoping mechanism rail production process and special rail butt joint tool thereof |
| CN105855744A (en) * | 2015-05-29 | 2016-08-17 | 咸宁职业技术学院 | Welding groove and welding method of narrow slit of crane track |
| CN107984062A (en) * | 2017-11-27 | 2018-05-04 | 江苏金通灵流体机械科技股份有限公司 | A kind of welding method of SUS316 austenitic stainless steels and Weldox700E low-alloy quenched and tempered steel different steel welds |
| CN110340528A (en) * | 2019-07-16 | 2019-10-18 | 湖北三江航天江北机械工程有限公司 | The welding method of airborne pencil rocket shell |
| CN113604650A (en) * | 2021-07-12 | 2021-11-05 | 武汉新瑞达激光工程有限责任公司 | Laser strengthening and toughening treatment method for steel rail welded joint |
-
2022
- 2022-08-01 CN CN202210917243.6A patent/CN115401407A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053024A (en) * | 2009-10-30 | 2011-05-11 | 中国石化集团第十建设公司 | Method for manufacturing test piece of hgdrogen induced cracking (HIC) and sulfide stress cracking (SSC) of welding material melting laid metal |
| CN103192236A (en) * | 2012-08-02 | 2013-07-10 | 上海振华重工集团（南通）有限公司 | Wharf ship loader telescoping mechanism rail production process and special rail butt joint tool thereof |
| CN105855744A (en) * | 2015-05-29 | 2016-08-17 | 咸宁职业技术学院 | Welding groove and welding method of narrow slit of crane track |
| CN107984062A (en) * | 2017-11-27 | 2018-05-04 | 江苏金通灵流体机械科技股份有限公司 | A kind of welding method of SUS316 austenitic stainless steels and Weldox700E low-alloy quenched and tempered steel different steel welds |
| CN110340528A (en) * | 2019-07-16 | 2019-10-18 | 湖北三江航天江北机械工程有限公司 | The welding method of airborne pencil rocket shell |
| CN113604650A (en) * | 2021-07-12 | 2021-11-05 | 武汉新瑞达激光工程有限责任公司 | Laser strengthening and toughening treatment method for steel rail welded joint |
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