CN114833487A - Welding method for 1000MPa steel for coal mine hydraulic support - Google Patents
Welding method for 1000MPa steel for coal mine hydraulic support Download PDFInfo
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- CN114833487A CN114833487A CN202210282883.4A CN202210282883A CN114833487A CN 114833487 A CN114833487 A CN 114833487A CN 202210282883 A CN202210282883 A CN 202210282883A CN 114833487 A CN114833487 A CN 114833487A
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- coal mine
- hydraulic support
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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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
- Y02P10/20—Recycling
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Abstract
The invention discloses a welding method of 1000MPa coal mine hydraulic support steel, which comprises the following steps: selecting materials, preheating, welding and carrying out heat treatment. The welding method comprises the steps of material selection, preheating, welding and heat treatment. According to the welding method for the steel for the 1000MPa coal mine hydraulic support, provided by the embodiment of the invention, the high-efficiency welding of the high-strength steel plate is realized by adopting the processes of material selection, preheating, welding and heat treatment and adopting the welding wire with the diameter of 1.2mm, the weldability and the economy are ensured, the welding difficulty is reduced, the welding quality is ensured, the cost is saved, and the purpose of high-efficiency welding is realized.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a welding method of 1000MPa coal mine hydraulic support steel.
Background
At present, the manufacturing and the use of the coal mine hydraulic support are developing towards large-scale and heavy-duty high-end directions, the coal mine fully-mechanized coal mining support is developing towards large-resistance and high-strength directions, the strength level of the coal mine fully-mechanized coal mining support is gradually improved from Q690 to Q890, and 1000MPa ultrahigh-strength steel is not applied in the field of coal mine hydraulic supports at present.
1000MPa high-strength steel, more alloy is added, the hardenability is large, and the welding difficulty is large. The high-strength steel Q960 has high strength grade, and the welding joint including a heat affected zone is easy to embrittle in the welding process, so that the key of the steel welding technology is to prevent the generation of welding cold cracks and ensure that the welding joint has excellent mechanical properties.
The invention patent CN 111375926A discloses a method for welding a hydraulic support ultrahigh-strength steel plate Q1150, the welding heat input is less than or equal to 1.25KJ/cm, the welding heat input is low, and the working condition production condition cannot be met.
The invention patent CN 109664039A discloses a Q890 steel plate welding dehydrogenation treatment and preweld preheating adjustment method, which does not relate to welding heat input and has the strength grade of Q890.
The invention patent CN105880834A discloses a welding method of Q890 high-strength steel, the heat treatment temperature after welding is 600 ℃, the heat treatment temperature is higher, and the welding heat input is not involved.
The invention provides a welding method of 1000MPa coal mine hydraulic support steel, and the welding heat input reaches 17 KJ/cm.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for welding 1000MPa coal mine hydraulic support steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a welding method of 1000MPa coal mine hydraulic support steel comprises the following steps:
(S1) selecting:
selecting a welding wire material, and cleaning a steel plate to be welded;
(S2), preheating:
preheating a steel plate;
(S3), welding:
welding the preheated steel plate;
(S4), heat treatment:
the steel sheet after welding is heat-treated.
Preferably, the welding wire in the step (S1) is phi 1.2mm, and the welding wire is prepared from the following raw materials in percentage by weight: c: 0.08-0.12%, Si: 0.65-0.10%, Mn: 1.75-1.95%, P: less than or equal to 0.02 percent, S: less than or equal to 0.018, Cr: 0.10-0.40%, Mo: 0.05 to 0.09%, Ni: 1.0-2.8%, Ti: 0.07-0.11% and the balance of iron.
Preferably, the welding wire in the step (S1) is phi 1.2mm, and the welding wire is prepared from the following raw materials in percentage by weight: c: 0.08-0.10%, Si: 0.65-0.85%, Mn: 1.75-1.85%, P: less than or equal to 0.01 percent, S: less than or equal to 0.015, Cr: 0.20-0.40%, Mo: 0.05 to 0.07%, Ni: 1.0-2.5%, Ti0.07-0.09%, and the balance of iron.
Preferably, the deposited metal has the following mechanical properties: the yield strength is more than or equal to 890MPa, the tensile strength is 940-1180MPa, the elongation is more than or equal to 15 percent, and the impact energy at minus 60 ℃ is more than or equal to 32J.
Preferably, the welding wire material selected in the step (S1) is carbon steel, and the shielding gas is 20% CO2+ 80% Ar, and the gas flow is 18-20L/min.
Preferably, the steel plates to be welded are cleaned in the step (S1) to facilitate further welding.
Preferably, in the step (S2) preheating process, the steel sheets to be welded are preheated to 100 ℃.
Preferably, in the step (S3), in the line welding of the steel sheet after the preheating, the welding current is 240 ± 20A, the welding voltage is 26 ± 2V, and the welding heat input is 17 KJ/cm.
Preferably, in the step (S3) of the welding process, the inter-road temperature is 100-.
Preferably, in the heat treatment step (S4), the steel sheet is post-weld heat-treated at 250℃ × 2h after welding.
According to the welding method for the steel for the 1000MPa coal mine hydraulic support, provided by the embodiment of the invention, the high-strength steel plate is welded by adopting the processes of material selection, preheating, welding and heat treatment and adopting the welding wire with the diameter of 1.2mm, so that the welding performance and the economy are ensured, the welding difficulty is reduced, the welding quality is ensured, the cost is saved, and the purpose of efficient welding is realized.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The following further describes a specific embodiment of the welding method of the 1000MPa coal mine hydraulic support steel with the combination of the attached drawing 1.
The welding method of the steel for the 1000MPa coal mine hydraulic support is not limited to the description of the following embodiment.
Example 1:
the thickness specification of the steel for the coal mine hydraulic support produced by the embodiment is 30 mm.
The embodiment provides a method for welding 1000MPa coal mine hydraulic support steel, which comprises the following steps:
(S1) selecting:
the welding wire material is selected to be carbon steel, the protective gas is 20% of CO2+ 80% of Ar, and the gas flow is 18-20L/min.
And the steel plates to be welded are cleaned, so that the further welding is facilitated.
In the step (S1), the welding wire is phi 1.2mm, and the welding wire is prepared from the following raw materials in percentage by weight: c: 0.08-0.10%, Si: 0.65-0.85%, Mn: 1.75-1.85%, P: less than or equal to 0.01 percent, S: less than or equal to 0.015, Cr: 0.20-0.40%, Mo: 0.05 to 0.07%, Ni: 1.0-2.5%, Ti0.07-0.09%, and the balance of iron.
(S2), preheating:
in the preheating process, the steel plates to be welded are preheated to 100 ℃.
(S3), welding:
in the line welding of the preheated steel plate, the welding current is 240 +/-20A, the welding voltage is 26 +/-2V, and the welding heat input is 17 KJ/cm.
In the welding process, the inter-channel temperature is 100-.
(S4), heat treatment:
in the heat treatment process, the steel plate is subjected to postweld heat treatment at 250 ℃ for 2h after welding.
Sampling the welding joints, wherein the tensile strength of the steel plate joints is reduced; and the welding joint is not cracked when the side bending and the positive and negative bending are both 120 degrees and is not broken when the angle is 180 degrees.
Tensile and bending properties of joint
The welding method for the steel for the 1000MPa coal mine hydraulic support provided by the embodiment of the invention realizes the welding of the 1000MPa high-strength steel plate, ensures the weldability and the economy, reduces the welding difficulty, ensures the welding quality, saves the cost and realizes the lightweight design concept of the hydraulic support.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A welding method of 1000MPa coal mine hydraulic support steel is characterized by comprising the following steps: the method comprises the following specific steps:
(S1) selecting:
selecting a welding wire material, and cleaning a steel plate to be welded;
(S2), preheating:
preheating a steel plate;
(S3), welding:
welding the preheated steel plate;
(S4), heat treatment:
the steel sheet after welding is heat-treated.
2. The welding method of the 1000MPa coal mine hydraulic support steel as set forth in claim 1, characterized in that: the welding wire in the step (S1) is phi 1.2mm, and the welding wire is prepared from the following raw materials in percentage by weight: c: 0.08-0.12%, Si: 0.65-0.10%, Mn: 1.75-1.95%, P: less than or equal to 0.02 percent, S: less than or equal to 0.018, Cr: 0.10-0.40%, Mo: 0.05 to 0.09%, Ni: 1.0-2.8%, Ti: 0.07-0.11% and the balance of iron.
3. The welding method of the 1000MPa coal mine hydraulic support steel as set forth in claim 1, characterized in that: the welding wire in the step (S1) is phi 1.2mm, and the welding wire is prepared from the following raw materials in percentage by weight: c: 0.08-0.10%, Si: 0.65-0.85%, Mn: 1.75-1.85%, P: less than or equal to 0.01 percent, S: less than or equal to 0.015, Cr: 0.20-0.40%, Mo: 0.05 to 0.07%, Ni: 1.0-2.5%, Ti0.07-0.09%, and the balance of iron.
4. The welding method of the steel for the 1000MPa coal mine hydraulic support, according to any one of claim 1, is characterized in that: the deposited metal has the following mechanical properties: the yield strength is more than or equal to 890MPa, the tensile strength is 940-1180MPa, the elongation is more than or equal to 15 percent, and the impact energy at minus 60 ℃ is more than or equal to 32J.
5. The manufacturing method of the steel for the 1000MPa coal mine hydraulic support according to claim 1, characterized by comprising the following steps: in the step (S1), the welding wire material is selected to be carbon steel, the protective gas is 20% CO2+ 80% Ar, and the gas flow is 18-20L/min.
6. The manufacturing method of the steel for the 1000MPa coal mine hydraulic support according to claim 1, characterized by comprising the following steps: and in the step (S1), the steel plates to be welded are cleaned, so that further welding is facilitated.
7. The manufacturing method of the steel for the 1000MPa coal mine hydraulic support according to claim 1, characterized by comprising the following steps: in the step (S2) preheating process, the steel sheets to be welded are preheated to 100 ℃.
8. The manufacturing method of the steel for the 1000MPa coal mine hydraulic support according to claim 1, characterized by comprising the following steps: in the step (S3), in the line welding of the preheated steel plate, the welding current is 240 +/-20A, the welding voltage is 26 +/-2V, and the welding heat input is 17 KJ/cm.
9. The manufacturing method of the steel for the 1000MPa coal mine hydraulic support according to claim 1, characterized by comprising the following steps: in the step (S3) of the welding process, the inter-lane temperature is 100-.
10. The manufacturing method of the steel for the 1000MPa coal mine hydraulic support according to claim 1, characterized by comprising the following steps: in the heat treatment process in the step (S4), the steel sheet is subjected to postweld heat treatment at 250℃ × 2h after welding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210282883.4A CN114833487A (en) | 2022-03-22 | 2022-03-22 | Welding method for 1000MPa steel for coal mine hydraulic support |
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| CN202210282883.4A CN114833487A (en) | 2022-03-22 | 2022-03-22 | Welding method for 1000MPa steel for coal mine hydraulic support |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513662A (en) * | 2011-12-23 | 2012-06-27 | 山东大学 | Q690 and Q980 high-strength dissimilar steel non-preheating welding method |
| CN102528241A (en) * | 2012-02-15 | 2012-07-04 | 重庆大江工业有限责任公司 | Method for welding high-strength steel hydraulic support member |
| CN105149741A (en) * | 2015-10-30 | 2015-12-16 | 山东中通钢构建筑股份有限公司 | Gas shielded welding technology of steel for Q960 ultrahigh-strength steel structure |
| US20160346877A1 (en) * | 2014-11-27 | 2016-12-01 | Baoshan Iron & Steel Co., Ltd. | Superhigh strength gas shielded welding wire and method for manufacturing the same |
| CN108274100A (en) * | 2018-04-26 | 2018-07-13 | 郑州煤矿机械集团股份有限公司 | The welding method of oil cylinder of hydraulic support stainless joint seat |
| CN111375926A (en) * | 2020-04-20 | 2020-07-07 | 中煤北京煤矿机械有限责任公司 | Method for welding ultrahigh-strength steel plate Q1150 of hydraulic support |
-
2022
- 2022-03-22 CN CN202210282883.4A patent/CN114833487A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513662A (en) * | 2011-12-23 | 2012-06-27 | 山东大学 | Q690 and Q980 high-strength dissimilar steel non-preheating welding method |
| CN102528241A (en) * | 2012-02-15 | 2012-07-04 | 重庆大江工业有限责任公司 | Method for welding high-strength steel hydraulic support member |
| US20160346877A1 (en) * | 2014-11-27 | 2016-12-01 | Baoshan Iron & Steel Co., Ltd. | Superhigh strength gas shielded welding wire and method for manufacturing the same |
| CN105149741A (en) * | 2015-10-30 | 2015-12-16 | 山东中通钢构建筑股份有限公司 | Gas shielded welding technology of steel for Q960 ultrahigh-strength steel structure |
| CN108274100A (en) * | 2018-04-26 | 2018-07-13 | 郑州煤矿机械集团股份有限公司 | The welding method of oil cylinder of hydraulic support stainless joint seat |
| CN111375926A (en) * | 2020-04-20 | 2020-07-07 | 中煤北京煤矿机械有限责任公司 | Method for welding ultrahigh-strength steel plate Q1150 of hydraulic support |
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