CN113369734A - Method for welding seamless steel pipe with high hardenability, high toughness and high strength - Google Patents
Method for welding seamless steel pipe with high hardenability, high toughness and high strength Download PDFInfo
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- CN113369734A CN113369734A CN202110619339.XA CN202110619339A CN113369734A CN 113369734 A CN113369734 A CN 113369734A CN 202110619339 A CN202110619339 A CN 202110619339A CN 113369734 A CN113369734 A CN 113369734A
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- welding
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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
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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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
-
- 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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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a welding method for a seamless steel pipe with high hardenability, high toughness and high strength, which aims at an S890 seamless steel pipe and adopts a 70 kg-grade high-strength solid welding wire for welding. Temperature and parameters during welding: the preheating temperature is more than or equal to 100 ℃, the welding current is less than or equal to 280A, the heat input is less than or equal to 1.3KJ/mm, and the interlayer temperature is less than or equal to 200 ℃. The welding part adopts a narrow gap groove. The wall thickness range of the seamless steel pipe is suitable for welding 20-70 mm, and the outer diameter range is larger than 168 mm. The high-hardenability, high-toughness and high-strength seamless steel tube high-toughness matching welding can be realized, the welding property and the economical efficiency are ensured, the welding difficulty is reduced, the welding quality is ensured, the production efficiency is improved, and the high-strength and high-reliability design concept of the hydraulic support is realized.
Description
Technical Field
The invention relates to a welding method of a coal mine hydraulic support, in particular to a welding method of a seamless steel pipe with high hardenability, high toughness and high strength.
Background
At present, most of hydraulic oil cylinders in high-end supports are of double-telescopic structures, the cylinder diameter is large along with the fact that the strength is higher and higher, the performance of a cylinder tube base metal is required to be higher and higher, a high-hardenability, high-toughness and high-strength seamless steel tube is urgently needed, the hydraulic support stand column is applied to a hydraulic support stand column with complex stress and high strength in a mine at present, an S890 seamless steel tube is mainly selected, and the research on a matched welding method is particularly important for guaranteeing the integral quality of the stand column.
In order to ensure that the hydraulic support can work with high reliability under a coal mine well, the welding quality of a main welding seam of the hydraulic oil cylinder is particularly important, and an effective welding method is required to reduce welding defects.
In the prior art:
the high-strength cylinder tube is generally welded by using 30CrMnSi, has high carbon equivalent, poor hardenability and high surface hardness, is easy to generate a hardening area, and needs complicated welding conditions to ensure weldability.
In order to improve the toughness and ensure the toughness of a welding joint, 60 kg-grade welding wires are selected for welding, so that the tensile strength of a welding seam is greatly reduced, and the requirements of high strength and high reliability are not met;
in order to ensure high strength, equal-strength welding wires are selected for matching, the welding difficulty is greatly increased, welding defects are easily generated in the welding process, if high-strength and high-toughness welding wires are selected, the purchase cost is greatly increased, and the economical efficiency is greatly reduced.
Disclosure of Invention
The invention aims to provide a welding method for a seamless steel pipe with high hardenability, high toughness and high strength.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a welding method for a seamless steel pipe with high hardenability, high toughness and high strength, which aims at an S890 seamless steel pipe and adopts a 70 kg high-strength solid welding wire for welding.
According to the technical scheme provided by the invention, the high-hardenability, high-toughness and high-strength seamless steel tube welding method provided by the embodiment of the invention can realize high-toughness matching welding of the high-hardenability, high-toughness and high-strength seamless steel tube, ensure the welding property and the economical efficiency, reduce the welding difficulty, ensure the welding quality and improve the production efficiency.
Drawings
FIG. 1 is a schematic view of a welding groove of a seamless steel pipe according to an embodiment of the present invention;
FIG. 2 is a graph showing a hardness test curve of a hardenability step in an example of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
The invention discloses a welding method for a seamless steel pipe with high hardenability, high toughness and high strength, which comprises the following preferred specific embodiments:
and aiming at the S890 seamless steel pipe, welding by using 70 kg of high-strength solid welding wire.
Temperature and parameters during welding:
the preheating temperature is more than or equal to 100 ℃, the welding current is less than or equal to 280A, the heat input is less than or equal to 1.3KJ/mm, and the interlayer temperature is less than or equal to 200 ℃.
The welding part adopts a narrow gap groove.
The wall thickness range of the seamless steel pipe is suitable for welding 20-70 mm, and the outer diameter range is larger than 168 mm.
The method for welding the seamless steel pipe with high hardenability, high toughness and high strength can realize high-toughness matching welding of the seamless steel pipe with high hardenability, high toughness and high strength, ensure the weldability and the economical efficiency, reduce the welding difficulty, ensure the welding quality, improve the production efficiency and realize the design concept of high strength and high reliability of the hydraulic support.
The specific embodiment is as follows:
the method is characterized in that research is carried out on high-toughness matching weldability of the seamless steel pipe with high hardenability, high toughness and high strength, 70 kg-grade high-strength solid welding wires with high toughness are determined and selected through a base metal performance test, a base metal heat treatment test, a welding wire deposited metal test and a welding joint test, preheating temperature and interlayer temperature are determined, and welding parameters which can be executed under working conditions are realized by adopting narrow-gap groove welding.
The process test contents are as follows:
1. base material property test
Mechanical property detection
| Measured value | Rp0.2(Mpa) | Rm(Mpa) | A％ |
| S890 | 810 | 880 | 17 |
Chemical composition detection
| Element(s) | Detection value |
| C | 0.16 |
| Si | 0.29 |
| Mn | 0.96 |
| P | 0.016 |
| S | 0.003 |
| Al | 0.026 |
| Ni | 1.24 |
| Cr | 0.68 |
2. Heat treatment test of base material
The hardenability step hardness test curve is shown in FIG. 2.
3. Test of welding wire deposited metal
Test results of welding wire
Through comprehensive performance comparison, a GHS-70 welding wire is selected to perform a welding joint test on S890
4. Test of welded joint
The concrete technical key points are as follows:
the process is innovative, and the weldability of the seamless steel pipe S890 with high hardenability, high toughness and high strength is improved;
by controlling the temperature and parameter control in the welding process, the preheating temperature is more than or equal to 100 ℃, the welding current is less than or equal to 280A, the heat input is less than or equal to 1.3KJ/mm, the interlayer temperature is less than or equal to 200 ℃, the welding quality and the mechanical property of a welding joint are ensured, the tensile strength meets the strength design requirement, and the high-reliability design concept is realized.
As shown in fig. 1, the narrow gap groove is designed to reduce welding amount, meet working condition production conditions, reduce welding difficulty, reduce heat influence on the base metal, and have high mechanical properties and low residual stress and residual deformation. And the welding quality is ensured. The wall thickness range of the seamless steel pipe is suitable for welding 20-70 mm. The outer diameter of the welded seamless steel pipe is larger than 168 mm.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A welding method for a seamless steel pipe with high hardenability, high toughness and high strength is characterized in that a 70 kilogram-grade high-strength solid welding wire is adopted for welding an S890 seamless steel pipe.
2. The welding method for high hardenability, high toughness, high strength seamless steel pipes according to claim 1, characterized in that the temperatures and parameters during welding are:
the preheating temperature is more than or equal to 100 ℃, the welding current is less than or equal to 280A, the heat input is less than or equal to 1.3KJ/mm, and the interlayer temperature is less than or equal to 200 ℃.
3. The method for welding seamless steel pipes with high hardenability, high toughness and high strength according to claim 2, wherein the welded portion is divided into narrow gaps.
4. The welding method for high hardenability, high toughness, high strength seamless steel pipes according to claim 1, 2 or 3, characterized in that it is suitable for welding seamless steel pipes with wall thickness ranging from 20 to 70mm and outer diameter ranging > 168 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110619339.XA CN113369734A (en) | 2021-06-03 | 2021-06-03 | Method for welding seamless steel pipe with high hardenability, high toughness and high strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110619339.XA CN113369734A (en) | 2021-06-03 | 2021-06-03 | Method for welding seamless steel pipe with high hardenability, high toughness and high strength |
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| Publication Number | Publication Date |
|---|---|
| CN113369734A true CN113369734A (en) | 2021-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110619339.XA Pending CN113369734A (en) | 2021-06-03 | 2021-06-03 | Method for welding seamless steel pipe with high hardenability, high toughness and high strength |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5300751A (en) * | 1991-08-30 | 1994-04-05 | Nkk Corporation | Method for gas-shield arc welding of a pipe and weld wire for use in the welding method |
| CN101337297A (en) * | 2008-08-12 | 2009-01-07 | 上海汽车改装厂有限公司 | Welding method of oil-box body for concrete pump and cover board and welding device thereof |
| CN102886593A (en) * | 2012-10-17 | 2013-01-23 | 山东电力集团公司电力科学研究院 | Welding method for Q460 high-strength steel tube of extra-high-voltage power transmission steel tube tower |
| CN108941861A (en) * | 2018-07-10 | 2018-12-07 | 蚌埠市行星工程机械有限公司 | 27SiMn seamless steel pipe flat welding process |
| CN111843262A (en) * | 2020-06-16 | 2020-10-30 | 中煤北京煤矿机械有限责任公司 | High-toughness matching narrow gap welding method for forging alloy steel and quenched and tempered high-strength steel |
-
2021
- 2021-06-03 CN CN202110619339.XA patent/CN113369734A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5300751A (en) * | 1991-08-30 | 1994-04-05 | Nkk Corporation | Method for gas-shield arc welding of a pipe and weld wire for use in the welding method |
| CN101337297A (en) * | 2008-08-12 | 2009-01-07 | 上海汽车改装厂有限公司 | Welding method of oil-box body for concrete pump and cover board and welding device thereof |
| CN102886593A (en) * | 2012-10-17 | 2013-01-23 | 山东电力集团公司电力科学研究院 | Welding method for Q460 high-strength steel tube of extra-high-voltage power transmission steel tube tower |
| CN108941861A (en) * | 2018-07-10 | 2018-12-07 | 蚌埠市行星工程机械有限公司 | 27SiMn seamless steel pipe flat welding process |
| CN111843262A (en) * | 2020-06-16 | 2020-10-30 | 中煤北京煤矿机械有限责任公司 | High-toughness matching narrow gap welding method for forging alloy steel and quenched and tempered high-strength steel |
Non-Patent Citations (2)
| Title |
|---|
| 李奎等: "液压支架立柱中缸S890钢焊接工艺研究", 《煤矿机械》 * |
| 蔡志伟等: "《钢结构焊接工艺及实施》", 31 January 2015 * |
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Application publication date: 20210910 |