CN114196805A - Surface strengthening treatment method for stainless steel composite pipe welding joint - Google Patents
Surface strengthening treatment method for stainless steel composite pipe welding joint Download PDFInfo
- Publication number
- CN114196805A CN114196805A CN202111583375.1A CN202111583375A CN114196805A CN 114196805 A CN114196805 A CN 114196805A CN 202111583375 A CN202111583375 A CN 202111583375A CN 114196805 A CN114196805 A CN 114196805A
- Authority
- CN
- China
- Prior art keywords
- welded joint
- joint
- welding joint
- heat treatment
- shot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/04—Tubes; Rings; Hollow bodies
Abstract
The invention discloses a method for strengthening the surface of a stainless steel composite pipe welding joint, which relates to the field of machining, and adopts the technical scheme that the method comprises the following steps: the method comprises the following steps: external cleaning: cleaning dust, impurities and oil stains outside the welded joint; step two: shot peening: performing surface treatment on the welding joint by adopting a standard steel shot AS110H with the diameter d of 0.425mm, wherein the shot jet speed v is 120m/s, and the coverage rate is 200%; step three: surface heat treatment: the welding joint after shot blasting treatment is placed into a heat treatment furnace for stress annealing treatment, the furnace entering temperature of a welding test piece is not higher than 200 ℃, the surface of the welding joint after heat treatment is polished, the polishing depth is controlled at 2/5 of a strengthening layer, the corrosion resistance of the welding joint is improved once again, and finally the welding joint after polishing is galvanized, so that the performance intensity of the welding joint is improved, and the welding joint is suitable for various severe occasions.
Description
Technical Field
The invention relates to the technical field of surface strengthening of welding joints, in particular to a method for strengthening the surface of a welding joint of a stainless steel composite pipe.
Background
A welded joint is a joint where two or more parts are to be joined by welding. Or a joint where two or more parts are joined by a welding process, including a weld, a fusion zone, and a heat affected zone. Fusion welded joints are formed by localized heating from a high temperature heat source. The weld joint is composed of weld metal, fusion zone, heat affected zone, and base metal, and its mechanical properties are determined by its chemical composition and structure. Thus, factors that affect the weld chemistry and the weld joint structure, both affect the performance of the weld joint.
Through retrieval, the invention patent with the Chinese patent number of CN103160664A discloses a method for strengthening the surface of a stainless steel welding joint, namely, the stainless steel welding joint is processed by utilizing a surface mechanical grinding technology, superfine grains are prepared on the surface of the stainless steel welding joint, and the surface strengthening treatment is carried out by adopting different modes according to different shapes and sizes of stainless steel weldments to be processed. The surface of the stainless steel welding joint treated by the method for strengthening the surface of the stainless steel welding joint does not generate plastic deformation, the surface hardness of the welding joint is effectively improved by grain refinement and residual compressive stress, the Vickers hardness of the strengthened surface is increased by 35-110%, and meanwhile, the roughness of the surface of the welding joint is reduced.
However, the above method can only strengthen the surface of the welded joint by shot blasting during operation, but the strength of the welded joint is low due to lack of surface heat treatment and subsequent grinding and plating, and the corrosion resistance is difficult to cope with a severe environment, so that a method for strengthening the surface of the welded joint of the stainless steel composite pipe is required.
Disclosure of Invention
The invention aims to solve the defects that the strength of a welding joint is low and the corrosion resistance is difficult to cope with severe environment due to the lack of surface heat treatment and subsequent polishing and electroplating in the prior art, and provides a method for strengthening the surface of the welding joint of a stainless steel composite pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for strengthening the surface of a stainless steel composite pipe welding joint comprises the following steps:
the method comprises the following steps: external cleaning: cleaning dust, impurities and oil stains outside the welded joint;
step two: shot peening: performing surface treatment on the welding joint by adopting a standard steel shot AS110H with the diameter d of 0.425mm, wherein the shot jet speed v is 120m/s, and the coverage rate is 200%;
step three: surface heat treatment: placing the welded joint subjected to shot blasting into a heat treatment furnace for stress annealing treatment, keeping the temperature of a welded test piece in the furnace at 590 +/-15 ℃ for 0.3h, controlling the temperature rise speed to be not higher than 150 ℃ and the cooling speed to be not higher than 120 ℃/h, and taking out the welded test piece when the temperature in the furnace is lower than 200 ℃;
step four: surface grinding: placing the welded joint subjected to heat treatment on a grinding machine, sequentially grinding the position of the welded joint by 600# and 1500# water grinding paper, and stopping grinding until the reinforced layer 2/5 is ground;
step five: electroplating: and placing the polished welding joint into an electroplating pool, and carrying out galvanizing treatment on the welding joint.
The above technical solution further comprises:
when the outside of the welding joint is cleaned, impurities such as oil stains and the like are removed through the machine head emulsion.
Before shot peening strengthening, a group of parts are put into a shot blasting chamber for shot blasting, then the shot blasting position is detected, and after the detection is qualified, shot peening strengthening is carried out on a welding joint.
The time for heat treatment of the welded joint during the surface heat treatment was controlled to 0.5 h.
The current and voltage during galvanization are 1500A and 24V respectively.
And passivating the galvanized welded joint, and dyeing or coating a light-protecting agent after passivation.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the surface of the welding joint can be preliminarily strengthened through shot blasting, and the natural corrosion potential at the welding joint is highest, the current density is lowest and the corrosion resistance is best through subsequent heat treatment for 0.5 h;
meanwhile, the surface of the welded joint after heat treatment is polished, the polishing depth is controlled at 2/5 of the strengthening layer, the corrosion resistance of the welded joint is improved again, and finally the polished welded joint is galvanized, so that the performance strength of the welded joint is improved, and the method is suitable for various severe occasions.
Detailed Description
Example one
Firstly, cleaning dust, impurities and oil stains outside a welded joint through a machine head emulsion, then placing a group of parts into a shot blasting chamber for shot blasting, performing surface treatment on the welded joint by adopting a standard steel shot AS110H with the diameter d of 0.425mm during shot blasting, detecting the shot blasting position, and placing the welded joint into the shot blasting chamber for shot blasting reinforcement after the shot blasting speed is 120m/s and the coverage rate is 200%;
secondly, placing the welded joint subjected to shot blasting strengthening into a heat treatment furnace for stress annealing treatment, keeping the temperature of a welded test piece in the furnace at 590 +/-15 ℃ for 0.3h, controlling the temperature rise speed to be not higher than 150 ℃ and the cooling speed to be not higher than 120 ℃/h, taking out the welded test piece when the temperature in the furnace is lower than 200 ℃, and controlling the time for heat treatment of the welded joint to be 0.5h in the surface heat treatment process;
and thirdly, placing the welded joint after heat treatment on a grinding machine, sequentially polishing the position of the welded joint through No. 600 and No. 1500 water-milled sand paper, polishing until the position of the strengthening layer 2/5 is polished, then placing the polished welded joint into an electroplating pool, performing zinc plating treatment on the welded joint, performing passivation treatment on the welded joint after zinc plating treatment, and dyeing or coating a light protection agent.
In the working process of the embodiment, the surface of the welding joint can be preliminarily strengthened through shot blasting, and the natural corrosion potential at the welding joint is highest, the current density is lowest and the corrosion resistance is best through subsequent heat treatment for 0.5 h;
and meanwhile, the surface of the welded joint after heat treatment is polished, the polishing depth is controlled at 2/5 of the strengthening layer, the corrosion resistance of the welded joint is improved again, and finally the polished welded joint is galvanized, so that the performance strength of the welded joint is improved, the method is suitable for various severe occasions, and finally the Vicat current density of an original welded joint sample is reduced from 4.79mA/cm2 to 0.32mA/cm2 in the test process.
Example two
Firstly, cleaning dust, impurities and oil stains outside a welded joint through a machine head emulsion, then placing a group of parts into a shot blasting chamber for shot blasting, performing surface treatment on the welded joint by adopting a standard steel shot AS110H with the diameter d of 0.425mm during shot blasting, detecting the shot blasting position, and placing the welded joint into the shot blasting chamber for shot blasting reinforcement after the shot blasting speed is 120m/s and the coverage rate is 200%;
secondly, placing the welded joint subjected to shot blasting strengthening into a heat treatment furnace for stress annealing treatment, keeping the temperature of a welded test piece in the furnace at 590 +/-15 ℃ for 0.5h, controlling the temperature rise speed to be not higher than 150 ℃ and the cooling speed to be not higher than 120 ℃/h, taking out the welded test piece when the temperature in the furnace is lower than 200 ℃, and controlling the time for heat treatment of the welded joint to be 1.5h in the surface heat treatment process;
and thirdly, placing the welded joint after heat treatment on a grinding machine, sequentially polishing the position of the welded joint through No. 600 and No. 1500 water-milled sand paper, polishing until the position of the strengthening layer 2/5 is polished, then placing the polished welded joint into an electroplating pool, performing zinc plating treatment on the welded joint, performing passivation treatment on the welded joint after zinc plating treatment, and dyeing or coating a light protection agent.
In operation, the embodiment can realize the primary strengthening of the surface of the welding joint through shot blasting, and through the subsequent heat treatment for 1.5h, the natural corrosion potential at the welding joint is increased from 0.58mA/cm2 of 0.5h to 0.72mA/cm2, and the performance of the welding joint is reduced through long-time heat treatment;
and meanwhile, the surface of the welded joint after heat treatment is polished, the polishing depth is controlled at 2/5 of the strengthening layer, the corrosion resistance of the welded joint is improved again, and finally the polished welded joint is galvanized, so that the performance strength of the welded joint is improved, the method is suitable for various severe occasions, and finally the Vicat current density of an original welded joint sample is reduced from 4.79mA/cm2 to 0.44mA/cm2 in the test process.
EXAMPLE III
Firstly, cleaning dust, impurities and oil stains outside a welded joint through a machine head emulsion, then placing a group of parts into a shot blasting chamber for shot blasting, performing surface treatment on the welded joint by adopting a standard steel shot AS110H with the diameter d of 0.425mm during shot blasting, detecting the shot blasting position, and placing the welded joint into the shot blasting chamber for shot blasting reinforcement after the shot blasting speed is 120m/s and the coverage rate is 200%;
secondly, placing the welded joint subjected to shot blasting strengthening into a heat treatment furnace for stress annealing treatment, keeping the temperature of a welded test piece in the furnace at 590 +/-15 ℃ for 0.3h, controlling the temperature rise speed to be not higher than 150 ℃ and the cooling speed to be not higher than 120 ℃/h, taking out the welded test piece when the temperature in the furnace is lower than 200 ℃, and controlling the time for heat treatment of the welded joint to be 0.5h in the surface heat treatment process;
and thirdly, placing the welded joint after heat treatment on a grinding machine, sequentially polishing the position of the welded joint through No. 600 and No. 1500 water-milled sand paper, polishing until the position of the strengthening layer 3/5 is polished, then placing the polished welded joint into an electroplating pool, performing zinc plating treatment on the welded joint, performing passivation treatment on the welded joint after zinc plating treatment, and dyeing or coating a light protection agent.
In the working process of the embodiment, the surface of the welding joint can be preliminarily strengthened through shot blasting, and the natural corrosion potential at the welding joint is highest, the current density is lowest and the corrosion resistance is best through subsequent heat treatment for 0.5 h;
meanwhile, the surface of the welded joint after heat treatment is polished, the polishing depth is controlled at 3/5 of the strengthening layer, and the surface is obtained through multiple tests;
when the reinforcing layer is polished to 1/5, the Vicat current density is 0.76mA/cm 2;
when the reinforcing layer is polished to 2/5, the Vicat current density is 0.42mA/cm 2;
when the reinforcing layer is polished to 3/5, the Vicat current density is 0.61mA/cm 2;
at the moment, the corrosion resistance of the welding joint is reduced, and finally the polished welding joint is galvanized, so that the performance strength of the welding joint is improved, the method is suitable for various severe occasions, and finally the Vicat current density of an original welding joint sample is reduced from 4.79mA/cm2 to 0.43mA/cm2 in the test process.
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 person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A method for strengthening the surface of a stainless steel composite pipe welding joint is characterized by comprising the following steps:
the method comprises the following steps: external cleaning: cleaning dust, impurities and oil stains outside the welded joint;
step two: shot peening: performing surface treatment on the welding joint by adopting a standard steel shot AS110H with the diameter d of 0.425mm, wherein the shot jet speed v is 120m/s, and the coverage rate is 200%;
step three: surface heat treatment: placing the welded joint subjected to shot blasting into a heat treatment furnace for stress annealing treatment, keeping the temperature of a welded test piece in the furnace at 590 +/-15 ℃ for 0.3h, controlling the temperature rise speed to be not higher than 150 ℃ and the cooling speed to be not higher than 120 ℃/h, and taking out the welded test piece when the temperature in the furnace is lower than 200 ℃;
step four: surface grinding: placing the welded joint subjected to heat treatment on a grinding machine, sequentially grinding the position of the welded joint by 600# and 1500# water grinding paper, and stopping grinding until the reinforced layer 2/5 is ground;
step five: electroplating: and placing the polished welding joint into an electroplating pool, and carrying out galvanizing treatment on the welding joint.
2. The method for strengthening the surface of the welded joint of the stainless steel composite pipe according to claim 1, wherein impurities such as oil stains are removed by the emulsion of the machine head when the outside of the welded joint is cleaned.
3. The method of claim 1, wherein the shot peening is performed on the welded joint of the stainless steel composite pipe by placing a group of parts in a shot blasting chamber before the shot peening, detecting the shot blasting position, and performing the shot peening on the welded joint after the detection is passed.
4. The method for surface strengthening treatment of the welded joint of the stainless steel composite pipe according to claim 1, wherein the time for heat treatment of the welded joint during the surface heat treatment is controlled to be 0.5 h.
5. The method for strengthening the surface of the welded joint of the stainless steel composite pipe according to claim 1, wherein the current in the galvanization is 1500A, and the voltage is 24V.
6. The method of claim 1, wherein the galvanized welded joint is passivated and then dyed or coated with a light protecting agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111583375.1A CN114196805B (en) | 2021-12-22 | 2021-12-22 | Surface strengthening treatment method for stainless steel composite pipe welding joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111583375.1A CN114196805B (en) | 2021-12-22 | 2021-12-22 | Surface strengthening treatment method for stainless steel composite pipe welding joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114196805A true CN114196805A (en) | 2022-03-18 |
| CN114196805B CN114196805B (en) | 2022-08-12 |
Family
ID=80656114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111583375.1A Active CN114196805B (en) | 2021-12-22 | 2021-12-22 | Surface strengthening treatment method for stainless steel composite pipe welding joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114196805B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2118364A1 (en) * | 1970-04-20 | 1971-10-28 | Superior Plating Co | Process for hard chrome plating a titanium substrate |
| JPS56114545A (en) * | 1980-02-13 | 1981-09-09 | Aida Eng Ltd | Cold forging method for housing having plural jaws of joint |
| CN1757484A (en) * | 2005-10-13 | 2006-04-12 | 南京工业大学 | Glass cloudburst treatment art for improving anti-stress corrosion performance of welding joint of stainless steel |
| CN110249062A (en) * | 2017-02-02 | 2019-09-17 | 蒂森克虏伯钢铁欧洲股份公司 | For in the method for plate building mode production wheel |
-
2021
- 2021-12-22 CN CN202111583375.1A patent/CN114196805B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2118364A1 (en) * | 1970-04-20 | 1971-10-28 | Superior Plating Co | Process for hard chrome plating a titanium substrate |
| JPS56114545A (en) * | 1980-02-13 | 1981-09-09 | Aida Eng Ltd | Cold forging method for housing having plural jaws of joint |
| CN1757484A (en) * | 2005-10-13 | 2006-04-12 | 南京工业大学 | Glass cloudburst treatment art for improving anti-stress corrosion performance of welding joint of stainless steel |
| CN110249062A (en) * | 2017-02-02 | 2019-09-17 | 蒂森克虏伯钢铁欧洲股份公司 | For in the method for plate building mode production wheel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114196805B (en) | 2022-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105420722B (en) | Steel structure anti-corrosion process | |
| CN102260775A (en) | Treatment method of stainless steel surface | |
| CN107267976B (en) | Laser combination processing technology for obtaining wear-resistant and corrosion-resistant titanium alloy workpiece | |
| CN104561876A (en) | Hot galvanizing technical method | |
| CN106078525A (en) | Large-scale galvanizing surface of the work Pretreatment Technology Before Finishing | |
| WO2019006901A1 (en) | Combined treatment method for improving corrosion resistance of metal component in chlorine-containing solution | |
| Li et al. | Effect of shot-blasting pretreatment on microstructures of hot-dip galvanized coating | |
| CN108342737A (en) | Pipe fitting processing technology | |
| CN114196805B (en) | Surface strengthening treatment method for stainless steel composite pipe welding joint | |
| CN104404587A (en) | Method for reducing embedding of sand blasting medium into electroplating steel surface | |
| CN110280973A (en) | A kind of hydraulic cylinder manufacture method | |
| CN107130241B (en) | A kind of surface laser cladding method of sucker rod, rod collar | |
| Knysh et al. | Influence of the atmosphere corrosion on the fatigue life of welded T-joints treated by high frequency mechanical impact | |
| CN101984129A (en) | Galvanizing technology for high-strength fastening piece | |
| CN111945092A (en) | Novel intelligent hot galvanizing process method for fastener | |
| CN105525337A (en) | Stainless steel surface treatment method | |
| WO2022199342A1 (en) | Surface matting process for low-manganese-content steel component of electric power iron tower and matte iron tower | |
| CN106947939A (en) | A kind of method that thermal diffusion prepares anti-corrosion reinforcing bar | |
| CN112853255B (en) | Zirconium-based material surface in-situ ceramic composite treatment method | |
| CN110653580A (en) | Method for processing offshore wind power flange | |
| CN109628875A (en) | A method of preparing iron-based material Zn based alloy mechanical bond modified layer | |
| KR100436597B1 (en) | Method for plating with molten aluminum | |
| CN115781101A (en) | Repair process for weld cracks of box body of sand blasting machine | |
| MA et al. | Comparative Study of Stress Corrosion Cracking Behaviors of Typical Microstructures of Weld Heat-Affected Zones of E690 High-Strength Low-Alloy Steel in SO2-Containing Marine Environment | |
| CN111500975B (en) | Surface treatment method for oil storage cylinder of shock absorber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |