CN111558777A - Laser shock based friction stir welding joint strengthening method - Google Patents
Laser shock based friction stir welding joint strengthening method Download PDFInfo
- Publication number
- CN111558777A CN111558777A CN202010405195.3A CN202010405195A CN111558777A CN 111558777 A CN111558777 A CN 111558777A CN 202010405195 A CN202010405195 A CN 202010405195A CN 111558777 A CN111558777 A CN 111558777A
- Authority
- CN
- China
- Prior art keywords
- laser
- friction stir
- welding
- metal
- layer
- 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.)
- Pending
Links
Images
Classifications
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/356—Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a friction stir welding joint strengthening method based on laser shock, which comprises the following steps: 1) welding a metal welding part by using a friction stir welding technology; 2) removing flash generated by welding by using an angle grinder and sand paper; 3) cleaning the polished surface of the weld joint to remove metal particles; 4) and sequentially laying an absorption layer and a restraint layer on the surface of the weld joint of the welded part, fixing the welded part on a six-axis robot clamp, and impacting the surface of the weld joint by using a laser impact strengthening technology to obtain the strengthened metal welded part. The invention provides a friction stir welding joint strengthening method which is high in controllability and adaptability, simple in process, green and environment-friendly.
Description
Technical Field
The invention relates to a laser shock based friction stir welding joint strengthening method, and belongs to the technical field of welding.
Background
Friction Stir Welding (FSW) is a new welding process invented in the nineties of the last century where the weld research in the uk was made, belonging to the solid phase welding process. Compared with other welding modes, the friction stir welding utilizes heat generated by friction heat and plastic deformation as a heat source, avoids hot cracks easily occurring in the fusion welding process, has the advantages of good welding seam quality, small residual stress of the welding seam and the like, and is widely applied in the fields of aerospace and automobile manufacturing. However, friction stir welding can only weld some materials with relatively low melting points, most commonly aluminum alloys, due to the low heat source energy introduced. In addition, the heat affected zone at the friction stir welded joint is softened, so that the physical properties of the joint are significantly reduced compared to the base material. Therefore, there is a need to find a process to improve the physical properties of friction stir weld joints.
Currently, laser processing techniques are widely used in the manufacturing field. The Laser processing technology is mainly divided into two types, one is a processing technology using a Laser thermal effect, such as Laser Welding (LW), Laser Cutting (LC), Laser Surface Texturing (LST), Laser thermoforming (LF), and the other is a processing technology using a Laser force effect, such as Laser Shock Peening (LSP), Laser Shock Forming (LSF), Laser Shock Texturing (LST). The laser shock peening technology utilizes the force effect of laser, and can effectively avoid the defect caused by the influence of the heat effect. This technique has a significant advantage: under the action of transient huge laser impact pressure, the surface and the subsurface of the material generate grain refining effect, and a deeper residual compressive stress layer is formed, so that the mechanical and physical properties of the material are enhanced. Therefore, it is a new technical approach to strengthen the friction stir welding joint by using the laser shock technique.
At present, the strengthening method of the friction stir welding joint, such as the invention named as "a method for improving the quality and mechanical properties of the 7XXX aluminum alloy friction stir welding joint" (patent No. 201510139804.4), can be searched, and the strengthening steps are as follows: firstly, carrying out friction stir welding on 7XXX series aluminum alloy, and then cooling to room temperature by using a PAG solution with the concentration of 5% -10%; then placing the aluminum alloy friction stir welding joint in an environment with the temperature of 40-80 ℃ for 2-8640 hours; and slowly heating the aluminum alloy friction stir welding joint to 100-160 ℃, preserving the heat for 2-36 hours, and finally cooling to room temperature. The method can improve the quality of the welding head, effectively regulate and control the state of the precipitation strengthening phase in the welding head and improve the mechanical property of the welding head. However, the method not only consumes long time, but also adopts chemical reagents, and has hidden danger of environmental pollution. As another example, the invention entitled "a method for improving the corrosion resistance of the surface of a heat-treated and strengthened aluminum alloy friction stir welding head" (patent No. 201610704360.9), the strengthening steps are as follows: in the surface area of the obtained aluminum alloy friction stir welding seam, a groove-hole alternate distribution structure is formed, Al86-Ni10-Ce6 amorphous alloy powder and/or Se + Bi powder are added, and the Al86-Ni10-Ce6 amorphous alloy powder and/or the Se + Bi powder are dispersed and distributed on the surface of the welding seam and a shallow area below the surface under the conditions of low temperature and large plastic deformation through secondary friction stir processing, so that the phase change process or partial metallurgical reaction is carried out on the metal in the area. Compared with the original weld joint surface, the method can greatly improve the corrosion resistance of the welded joint. However, the method has many steps, and residual stress is introduced during drilling and grooving, so that other physical properties of the joint are easily reduced. As another invention named as "a method for improving the strength of a friction stir welding joint of non-heat-treated reinforced aluminum alloy" (patent No. 201810666759.1), the reinforcing steps are as follows: concave platforms are respectively processed on the butt joint surfaces of the welded plate pieces according to the plate thickness; respectively clamping the plate with the concave stations on a workbench with a water tank to form a groove along a butt joint line; filling the reinforced phase particles into the groove, compacting, and sealing the notch by using a needleless stirring head; and injecting water into the water tank, and performing multi-pass reciprocating welding along the butt joint line by using a friction stir welding tool. The method is simple to operate, low in investment and easy to implement, but the groove is difficult to machine when the thin plate is welded. Therefore, the friction stir welding joint strengthening method which is simple in process, green and environment-friendly, good in controllability and wide in applicability needs to be invented.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the technical problem of poor physical properties of the existing friction stir welding joint is solved.
In order to solve the technical problem, the invention provides a friction stir welding joint strengthening method based on laser shock, which is characterized by comprising the following steps of:
step 1): placing two metal welding pieces A to be welded on a friction stir welding workbench, and adjusting welding parameters to weld according to production requirements to obtain a metal welding piece B which is welded;
step 2): removing burrs caused by friction stir welding from the metal welding part B obtained in the step 1) to obtain a polished metal welding part C;
step 3): cleaning the surface of the metal welding part C obtained in the step 2), and removing metal particles generated in the polishing process;
step 4): laying an absorption layer on the surface of the weld joint of the metal welding part D obtained in the step 3) for absorbing laser energy to generate plasma and form shock waves; laying a layer of restraint layer above the absorption layer to improve the amplitude of laser impact pressure and prolong the action time of the pressure;
step 5): fixing the metal welding part D paved with the absorption layer and the constraint layer, adjusting laser shock parameters according to production requirements, outputting laser beams by using a laser, changing the transmission direction and focusing the laser beams through an optical device, absorbing the laser beams by the absorption layer through the constraint layer, generating plasma explosion to form shock waves, impacting welding seams of the metal welding part to obtain a metal welding part E subjected to laser shock, and strengthening the physical properties of a friction stir welding joint of the metal welding part.
Preferably, in the step 1), the metal welding piece a is firstly subjected to fillet grinding to remove the flash caused by friction stir welding, and then the residual flash is further ground by using sand paper.
Preferably, alcohol is used as a detergent in the step 3) to clean the surface of the welding part.
Preferably, the absorbing layer in the step 4) is black polytetrafluoroethylene tape or black paint.
Preferably, the constraint layer in the step 4) is water or optical glass.
Preferably, the laser in the step 5) adopts a high-power Q-switched Nd: YAG laser, and the energy of the laser beam follows a nearly flat-top distribution.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a friction stir welding joint strengthening method based on laser shock, which is a brand new friction stir welding joint strengthening process; compared with the existing strengthening process, the process provided by the invention has fewer steps and is simple to operate.
(2) The laser shock peening technology is adopted as a main processing means, so that positions which are not easy to be strengthened by other technologies such as non-planar welding seams such as fillet welding and curved welding seams can be strengthened, and compared with other strengthening technologies, the laser shock peening technology has the advantages of good controllability and wide application range.
(3) The process flow of the invention does not introduce heat sources except for the friction stirring pin, thereby reducing the influence of heat on the welding joint.
(4) The process flow of the invention does not adopt chemical reagents which can pollute the environment, and is environment-friendly and environment-friendly.
Drawings
FIG. 1 is a process flow diagram of a laser shock based method for strengthening a friction stir weld joint according to the present invention;
FIG. 2 is a flow chart of a friction stir welding process;
fig. 3 is a flow chart of laser shock.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Examples
A friction stir welding joint strengthening method based on laser shock comprises the following steps:
step 1: placing two metal welding pieces A1 to be welded on a friction stir welding workbench, and adjusting welding parameters to weld according to production requirements to obtain a metal welding piece B5 after welding; the stirring head 4 is adopted during welding;
step 2: removing the flashes 2 caused by friction stir welding from the metal welding part B5 obtained in the step 1 by using an angle grinder, and further grinding the residual flashes 2 by using sand paper 6 to obtain a ground metal welding part C7;
and step 3: cleaning the surface of the metal welding part C7 obtained in the step 2 (adopting alcohol as a detergent 8), and removing metal particles generated in the polishing process;
and 4, step 4: laying an absorption layer 10 (black polytetrafluoroethylene tape or black paint) on the surface of the weld joint 3 of the metal welding part D9 obtained in the step 3, wherein the absorption layer is used for absorbing laser energy to generate plasma and form shock waves; a layer of restraint layer 11 (water or optical glass) is laid above the absorption layer to improve the amplitude of laser impact pressure and prolong the pressure action time;
and 5: fixing the metal welding part D9 paved with the absorption layer 10 and the restraint layer 11 on a six-axis robot clamp 16 of a six-axis robot 17, adjusting laser shock parameters according to production requirements, outputting a laser beam 12 by using a laser 13 (adopting a high-power Q-switched Nd: YAG laser, and laser beam energy follows nearly flat-top distribution), changing and focusing the transmission direction of the laser 12 through an optical device 15, absorbing the laser by the absorption layer 12 through the restraint layer 11 to generate plasma explosion to form shock waves, impacting a welding seam 3 of the metal welding part to obtain the metal welding part E14 after laser shock, and strengthening the physical performance of a stirring friction welding joint of the metal welding part.
Claims (6)
1. A friction stir welding joint strengthening method based on laser shock is characterized by comprising the following steps:
step 1): placing two metal welding parts A (1) to be welded on a friction stir welding workbench, and adjusting welding parameters to weld according to production requirements to obtain a welded metal part B (5);
step 2): removing the flash (2) caused by friction stir welding from the metal welding part B (5) obtained in the step 1) to obtain a polished metal welding part C (7);
step 3): cleaning the surface of the metal welding part C (7) obtained in the step 2), and removing metal particles generated in the polishing process;
step 4): laying an absorption layer (10) on the surface of the welding seam of the metal welding part D (9) obtained in the step 3), wherein the absorption layer is used for absorbing laser energy to generate plasma and form shock waves; a layer of restraint layer (11) is laid above the absorption layer to improve the amplitude of laser impact pressure and prolong the action time of the pressure;
step 5): fixing a metal welding part D (9) paved with an absorption layer (10) and a constraint layer (11), adjusting laser shock parameters according to production requirements, outputting a laser beam (12) by using a laser (13), changing the transmission direction and focusing the laser (12) through an optical device (15), absorbing the laser (12) by the absorption layer (12) through the constraint layer (11), generating plasma explosion to form shock waves, impacting a welding seam (3) of the metal welding part to obtain a metal welding part E (14) subjected to laser shock, and strengthening the physical performance of a stirring friction welding joint of the metal welding part.
2. The laser shock based friction stir weld joint strengthening method according to claim 1, characterized in that in step 1), the metal weld part a (5) is first removed by an angle grinder to remove the flash (2) caused by friction stir welding, and then the residual flash (2) is further ground by sand paper (6).
3. The laser shock based method for strengthening a friction stir weld joint according to claim 1, wherein the surface of the weld is cleaned in step 3) using alcohol as a detergent (8).
4. The laser shock based method for strengthening a friction stir weld joint according to claim 1, wherein the absorbing layer (10) in step 4) is black teflon tape or black paint.
5. The laser shock based friction stir weld joint strengthening method according to claim 1, characterized in that the constraining layer (11) in step 4) is water or optical glass.
6. The laser shock based friction stir weld joint strengthening method of claim 1, wherein the laser (13) in step 5) is a high power Q-switched Nd: YAG laser, and the laser beam energy follows a nearly flat-top profile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010405195.3A CN111558777A (en) | 2020-05-14 | 2020-05-14 | Laser shock based friction stir welding joint strengthening method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010405195.3A CN111558777A (en) | 2020-05-14 | 2020-05-14 | Laser shock based friction stir welding joint strengthening method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111558777A true CN111558777A (en) | 2020-08-21 |
Family
ID=72071000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010405195.3A Pending CN111558777A (en) | 2020-05-14 | 2020-05-14 | Laser shock based friction stir welding joint strengthening method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111558777A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505723A (en) * | 2022-11-22 | 2022-12-23 | 北京航空航天大学 | Laser shock peening-based aluminum alloy friction stir welding butt joint strengthening and toughening method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834659A (en) * | 2017-01-25 | 2017-06-13 | 中国人民解放军空军工程大学 | The method that ps pulsed laser and ns pulsed laser impacts stainless steel welded joint stress corrosion resistant |
| CN108517519A (en) * | 2018-04-08 | 2018-09-11 | 东北大学 | A kind of laser treatment raising corrosion proof method of Al-Zn-Mg (Cu) Aluminum Alloy Friction Stir Welding |
| CN108907451A (en) * | 2018-07-20 | 2018-11-30 | 东华大学 | A method of improving sliding bearing wearability and service life |
| CN109666788A (en) * | 2019-02-28 | 2019-04-23 | 西北有色金属研究院 | Regulate and control the laser impact processing method of titanium alloy plate welding point residual stress |
| CN109837382A (en) * | 2019-04-17 | 2019-06-04 | 中国人民解放军空军工程大学 | A kind of aerial engine fan casing aperture weld seam position laser shock peening method |
| CN110640302A (en) * | 2019-09-26 | 2020-01-03 | 东华大学 | Micro-texture preparation method based on laser composite process |
| CN111014959A (en) * | 2019-12-30 | 2020-04-17 | 东华大学 | Bionic surface preparation method based on laser impact imprinting technology |
-
2020
- 2020-05-14 CN CN202010405195.3A patent/CN111558777A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834659A (en) * | 2017-01-25 | 2017-06-13 | 中国人民解放军空军工程大学 | The method that ps pulsed laser and ns pulsed laser impacts stainless steel welded joint stress corrosion resistant |
| CN108517519A (en) * | 2018-04-08 | 2018-09-11 | 东北大学 | A kind of laser treatment raising corrosion proof method of Al-Zn-Mg (Cu) Aluminum Alloy Friction Stir Welding |
| CN108907451A (en) * | 2018-07-20 | 2018-11-30 | 东华大学 | A method of improving sliding bearing wearability and service life |
| CN109666788A (en) * | 2019-02-28 | 2019-04-23 | 西北有色金属研究院 | Regulate and control the laser impact processing method of titanium alloy plate welding point residual stress |
| CN109837382A (en) * | 2019-04-17 | 2019-06-04 | 中国人民解放军空军工程大学 | A kind of aerial engine fan casing aperture weld seam position laser shock peening method |
| CN110640302A (en) * | 2019-09-26 | 2020-01-03 | 东华大学 | Micro-texture preparation method based on laser composite process |
| CN111014959A (en) * | 2019-12-30 | 2020-04-17 | 东华大学 | Bionic surface preparation method based on laser impact imprinting technology |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505723A (en) * | 2022-11-22 | 2022-12-23 | 北京航空航天大学 | Laser shock peening-based aluminum alloy friction stir welding butt joint strengthening and toughening method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103409758B (en) | Pump shells and blade microcrack laser reinforcing life-prolonging method | |
| CN102240841B (en) | Submerged-arc welding process for T-type joint for extra thick steel plate | |
| CN109366256B (en) | A kind of composite polishing method based on laser and plasma | |
| Saeedy et al. | Investigation of the effects of critical process parameters of friction stir welding of polyethylene | |
| CN102615431B (en) | Remanufacturing method for automatic laser cladding of gray cast iron cylinder cover | |
| CN111545918B (en) | Laser polishing and laser shock strengthening manufacturing method for welding or additive repairing area | |
| CN111088488A (en) | 3D printing method based on laser cladding and laser shock | |
| CN112518159B (en) | Surface treatment and welding device and method for metal workpiece | |
| Ning et al. | Effects of double-pass welding and extrusion on properties of fiber laser welded 1.5-mm thick T2 copper joints | |
| CN111558777A (en) | Laser shock based friction stir welding joint strengthening method | |
| CN113414496A (en) | Method for enhancing connection strength of composite material and metal through ultrafast laser treatment | |
| CN102398105A (en) | Process for integral hardening and tempering of X80 steel-grade automatic submerged arc welding pipe fittings | |
| CN112139667A (en) | Ultrasonic-assisted swing laser welding method for hot stamping formed steel | |
| CN113305437A (en) | Thermoplastic composite material-metal laser welding method | |
| CN111975202A (en) | Laser welding method for dissimilar metal materials | |
| JP2006122969A (en) | Welded joint of metallic material and metallic clad material, and laser peening of casting material | |
| CN112475794A (en) | Process for solving cracking problem of high-strength steel composite plate welded by vacuum electron beam | |
| CN112210774A (en) | Laser cladding repair method for machine tool failure gear | |
| CN112192039A (en) | Processing method of continuous fiber reinforced porous composite material | |
| CN105364430B (en) | The method for laser welding that a kind of thin plate edge joint synchronously rolls | |
| CN109483071B (en) | Method for laser-friction stir composite welding of large-thickness plate | |
| CN109332923B (en) | Automatic splicing method of ferritic stainless steel for explosive welding | |
| CN110666313A (en) | Welding process for thick-wall beam column of ocean engineering equipment | |
| CN104451662A (en) | Combined treatment method for crack repair and strengthening of part in high-temperature working environment | |
| CN112016228A (en) | Modeling method of underwater welding heat source model based on water-cooling compression coefficient |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200821 |
|
| RJ01 | Rejection of invention patent application after publication |