CN103131975A - Processing method of high speed train aluminum alloy welding structure - Google Patents
Processing method of high speed train aluminum alloy welding structure Download PDFInfo
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- CN103131975A CN103131975A CN2012105787334A CN201210578733A CN103131975A CN 103131975 A CN103131975 A CN 103131975A CN 2012105787334 A CN2012105787334 A CN 2012105787334A CN 201210578733 A CN201210578733 A CN 201210578733A CN 103131975 A CN103131975 A CN 103131975A
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Abstract
The invention provides a processing method of a high speed train aluminum alloy welding structure, and relates to the field of welding joint residual stress elimination and fatigue performance improvement by means of ultrasonic impact technology. The processing method is used for resolving the problems that a high speed train body welding portion is mostly provided with section bars in complex structures, and the fact that existing technology is adapted to a complex welding structure is difficult. The processing method comprises the steps that aiming at the four conditions that welding portions belong to welding lines, welding toes, heat affected zones and base material all welding lines, ultrasonic impact pressure heads are chosen, ultrasonic impact pressure heads with strip-shaped sections are chosen for the welding lines and the welding toes, and the ultrasonic impact pressure heads with circular sections are chosen for the heat affected zones and the base material all welding lines; chosen ultrasonic impact pressure heads are assembled to ultrasonic impact equipment; and the ultrasonic impact equipment is started to carry out a positional impact process for the surface of the aluminum alloy welding structure one by one, various positions in the impact process are uniformly arranged and adjacent, and a 10-micrometer nanolayer is formed on the surface of the aluminum alloy welding structure.
Description
Technical field
The present invention relates to the field that the ultrasonic impact technology is eliminated the welding joint unrelieved stress and improved fatigue property.
Background technology
China Express Railway is concentrated, is developed fast in recent years, and bullet train is fast development thereupon also.And the safe reliability of bullet train is the principal element of restriction bullet train development.Welding is the integrated gordian technique of high-speed train body, and the reliability of welding joint is determining the safe reliability of high-speed train body.The fatigue property of Under Dynamic Load lower sub when the principal element that affects reliability of solder joints is the unrelieved stress of postwelding and train operation., linear expansivity high due to high-speed train body aluminium alloy thermal conductance coefficient is large, complex structure, and the unrelieved stress of high-speed train body welded joints in aluminium alloy is very serious.The existence of unrelieved stress can have a strong impact on performance and the safe reliability of welding assembly, cause the size of welding assembly and structure unstable, reduce the problem such as assembly precision, but also can with the factor interactions such as welding flaw, affect the performances such as intensity of welding tractor body structure, reduce the safe reliability of body construction.On the other hand, in the aluminum alloy junction member, 90% fracture is to be caused by the fatigure failure that welding joint bears the welding joint of repeated dynamic load according to statistics, and the fatigue failure of member happen suddenly often catastrophic, be the major reason that causes security incident.Therefore the unrelieved stress of eliminating the bullet train welded joints in aluminium alloy is improved the joint fatigue property and can be significantly improved its work-ing life and safe reliability, and the development of high-speed railway cause is of great practical significance.
The method that reduces at present and improve unrelieved stress mainly contains preliminary draft method, thermal life method, natural aging method, oscillating aging method and ultrasonic impact method etc.But mostly the high-speed train body weld is the section bar of shape and structure complexity, the distribution of postwelding trending extensional tectonic stress field and deformation field is difficult to simulation and prediction, therefore the preliminary draft method can't be estimated the deformation rule of postwelding accurately, therefore is not suitable for eliminating the unrelieved stress of bullet train aluminum alloy joint.And heat treating process and natural aging method need a large amount of electric energy and process period, and cost and the time expended are too many.The oscillating aging method needs a large amount of experiment and knowwhy, operator's experience is required high, and noise of equipment is large, and online stress-removal etc. has limited its application on high-speed train body welding joint stress-removal.
Summary of the invention
Mostly the treatment process that the purpose of this invention is to provide a kind of bullet train aluminum alloy welding connecting structure is the section bar of shape and structure complexity to solve the high-speed train body weld, prior art is difficult to adapt to complicated welded shortcoming.The present invention includes following step: one, belong to weld seam, toe of weld, heat affected zone, four kinds of situations selection ultrasonic impact pressure heads of the full welded seam area of mother metal for the weld, the cross section of described ultrasonic impact pressure head is " bar shaped " or " circle "; Being " bar shaped " ultrasonic impact pressure head for weld seam and toe of weld selection cross section, is " circle " ultrasonic impact pressure head for heat affected zone and the full welded seam area selection of mother metal cross section; Two, the ultrasonic impact pressure head of choosing is assembled on ultrasonic impact equipment; Three, opening ultrasonic impact equipment the shock treatment of position is one by one carried out on the surface of aluminum alloy welding connecting structure, evenly arranges and is adjacent in each position of shock treatment, forms the nanometer layer of 10 μ m on the surface of aluminum alloy welding connecting structure.
Car body welding joint for bullet train, the advantages such as the topworks of ultrasonic impact treatment technology has lightly flexibly, efficient is high, noise is little, cost is low, but because the joint design of bullet train aluminium alloy is complicated, the residual stress field regularities of distribution etc. are still undistinct, so the ultrasonic impact method not yet is applied on bullet train aluminium alloy unrelieved stress is eliminated at present.On the other hand, improve the fatigue property aspect of joint, the fatigue property that the ultrasonic impact method can significantly improve steel is confirmed, its not yet systematic research of impact on the fatigue property of welded joints in aluminium alloy.The object of the invention is in ultrasonic impact technology implementation and bullet train aluminium alloy element, eliminate joint unrelieved stress, improve its fatigue property, improve the safe reliability of bullet train operation.
Description of drawings
Fig. 1 is the test point distribution schematic diagram of obtained test value in embodiment 1 table 1, Fig. 2 is fatiguespecimen dimensioned drawing in embodiment 2, Fig. 3 is sample fatigue property comparison diagram before and after the Welded structural impact, X-coordinate is " number of times ", ordinate zou is Δ σ (unit is megapascal (MPa)), and Fig. 4 is the X-ray diffraction spectral line comparison diagram of different process in embodiment 3, X-coordinate be θ (°), ordinate zou is the zero dimension physical quantity, there is no unit.The exciting current that in figure, curve is distinguished corresponding ultrasonic impact from top to down is at 2.2A, and the attack time is 30min, 40min, 45min, 50min, X-ray diffraction spectral line during 60min (being in the embodiments of the invention scope).Fig. 5 is average grain size schematic diagram, size/strain as we can see from the figure: grain-size (A)=378 (29), strain=0.1348 (0.01441) %, ESD match=0.000499, error=0.988.
Embodiment
Embodiment one: the following present embodiment that illustrates.Present embodiment comprises the steps: one, belongs to weld seam, toe of weld, heat affected zone, four kinds of situations selection ultrasonic impact pressure heads of the full welded seam area of mother metal for the weld, and the cross section of described ultrasonic impact pressure head is " bar shaped " or " circle "; Being " bar shaped " ultrasonic impact pressure head for weld seam and toe of weld selection cross section, is " circle " ultrasonic impact pressure head for heat affected zone and the full welded seam area selection of mother metal cross section; Two, the ultrasonic impact pressure head of choosing is assembled on ultrasonic impact equipment; Three, opening ultrasonic impact equipment the shock treatment of position is one by one carried out on the surface of aluminum alloy welding connecting structure, evenly arranges and is adjacent in each position of shock treatment, forms the thin brilliant nanometer layer of 10 μ m on the surface of aluminum alloy welding connecting structure.The weld seam of butt junction, toe of weld, heat affected zone, the full welded seam area of mother metal are processed the elimination unrelieved stress, make the fatigue property of joint significantly improve, and the duralumin layer of shatter aluminum alloy surface, slow down the duralumin layer to the impact of corrosion.
Embodiment two: present embodiment is compared with embodiment one and further defined described ultrasonic impact equipment is that bold and unconstrained gram can the ultrasonic impact treatment facility.
Embodiment three: present embodiment compare with embodiment two further define operating frequency that described bold and unconstrained gram can the ultrasonic impact treatment facility 19 to 21kHz, to 1100W, amplitude is at 40 to 60 μ m 800 for operating power.
Embodiment four: present embodiment compare with embodiment three further define its exciting current 1 to 3A, make joint surface produce stress after processing, the affecting the degree of depth and can reach 3mm of unrelieved stress, change the distribution of surface residual stress field, make the highest improvement degree can reach 80%.
Present embodiment has the following advantages compared with prior art:
1, for the large complicated welding assembly joint of high-speed train body, the ultrasonic impact treatment technology have light and handy flexibly, be easy to carry, the advantage such as efficient is high, noise is little, cost is low, adapt to various field working conditions.
2, elimination unrelieved stress effect is good, and in the useful stress of welding joint surface generation, the highest improvement can reach 80%, can satisfy the requirement of bullet train Welded unrelieved stress.
3, to improve effect good for fatigue property, significantly improved the fatigue strength of bullet train welded joints in aluminium alloy, ensured the safe reliability of bullet train.
4, adopt a kind for the treatment of measures, the effect that can obtain simultaneously to eliminate unrelieved stress He improve fatigue property has simplified subsequent treatment process, has reduced cost.
5, this invention is through the actual road test of 1,800,000 kilometers, verified and adopted present technique to the elimination of unrelieved stress with to the effect of improving of fatigue property, satisfies the requirement that bullet train aluminium closes welding joint unrelieved stress and fatigue property.
Embodiment 1
The present embodiment is about eliminating the treatment measures of bullet train aluminium alloy unrelieved stress.
The present embodiment eliminate the welding joint unrelieved stress the welding joint test specimen adopt bullet train Aluminium Alloys in Common Use 7XXX mother metal, adopt manual MIG to weld, the postwelding sample dimensions is 300 * 220 * 12mm, weld width is 20mm.Ultrasonic impact is processed and to be carried out for weld seam is region-wide, and the frequency of ultrasonic impact equipment is transferred to 19150Hz, and amplitude transfers to 50 μ m.
The toe of weld zone adopts cross section to process for the ultrasonic impact head of " circle ", and Seam and heat effected zone territory employing cross section is processed for " bar shaped " ultrasonic impact pressure head.The exciting current of ultrasonic impact is at 2.2A, and the attack time is 1min.Postwelding is not done the joint regional of ultrasonic impact processing with employing iXRD unrelieved stress tester and the horizontal and vertical residual-stress value of the joint regional after the ultrasonic impact processing is measured and contrasted, as shown in Fig. 1 and table 1.Can find by above data, to point-2, the transvrsal stress amount of cancellation is 216MPa.The meridional stress amount of cancellation is respectively 111.9MPa.This shows, be eliminated through residual tension in toe of weld after ultrasonic impact, all be converted into residual compressive stress.To putting 2, the transvrsal stress amount of cancellation is 280.3MPa.The meridional stress amount of cancellation is 135.3MPa.This shows at the residual tension of this welding toe, in various degree elimination is arranged also, and be converted into residual compressive stress.And original residual compressive stress also increases.Table 1A district (as-welded) stress test value
| X | 0 | 0 | 0 | 0 | 0 | 0 |
| Y | 0 | 2 | 4 | 6 | 11 | 16 |
| Point position | The heat affected zone | The heat affected zone | The heat affected zone | Toe of weld | Weld seam | Weld seam |
| σx | -19.06 | -1.53 | 42.92 | 37.84 | 25.67 | 7.11 |
| σy | -52.48 | 13.36 | -141.77 | -42.78 | -18.42 | 11.93 |
| X | 0 | 0 | 0 | 0 | 0 | ? |
| Y | 21 | 26 | 28 | 30 | 32 | ? |
| Point position | Weld seam | Toe of weld | The heat affected zone | The heat affected zone | The heat affected zone | ? |
| σx | -47.86 | -18.28 | -63.61 | -24.54 | 72.99 | ? |
| σy | -3.33 | -26.28 | -74.45 | 6.30 | -45.06 | ? |
| |
5 | 5 | 5 | 5 | 5 | 5 |
| Y | 0 | 2 | 4 | 6 | 11 | 16 |
| Point position | The heat affected zone | The heat affected zone | The heat affected zone | Toe of weld | Weld seam | Weld seam |
| σx | -41.18 | -28.50 | 47.60 | 47.68 | 43.33 | -2.58 |
| σy | -41.15 | -11.07 | -66.89 | -35.37 | -30.84 | -37.13 |
| |
5 | 5 | 5 | 5 | 5 | ? |
| Y | 21 | 26 | 28 | 30 | 32 | ? |
| Point position | Weld seam | Toe of weld | The heat affected zone | The heat affected zone | The heat affected zone | ? |
| σx | -77.88 | 77.46 | 0.34 | 15.38 | 8.96 | ? |
| σy | -112.51 | -0.35 | -44.97 | -59.95 | 61.60 | ? |
| |
10 | 10 | 10 | 10 | 10 | 10 |
| Y | 0 | 2 | 4 | 6 | 11 | 16 |
| Point position | The heat affected zone | The heat affected zone | The heat affected zone | Toe of weld | Weld seam | Weld seam |
| σx | 12.83 | 8.96 | -34.35 | 71.91 | -25.89 | -18.45 |
| σy | -9.37 | 60.73 | -99.66 | -15.11 | -9.98 | -15.71 |
| |
10 | 10 | 10 | 10 | 10 | ? |
| Y | 21 | 26 | 28 | 30 | 32 | ? |
| Point position | Weld seam | Toe of weld | The heat affected zone | The heat affected zone | The heat affected zone | ? |
| σx | -29.63 | -16.07 | -23.24 | -14.31 | 67.87 | ? |
| σy | 80.34 | -35.96 | -25.05 | -24.17 | -44.70 | ? |
Table 2E district (the stress test value of 60s-2.2A)
| X | 0 | 0 | 0 | 0 | 0 | 0 |
| Y | 0 | 2 | 4 | 6 | 11 | 16 |
| Point position | The heat affected zone | The heat affected zone | The heat affected zone | Toe of weld | Weld seam | Weld seam |
| σx | -73.50 | -137.16 | -91.96 | -143.60 | -136.18 | -145.82 |
| σy | -51.84 | -49.07 | -76.87 | -53.93 | -108.59 | -129.42 |
| X | 0 | 0 | 0 | 0 | 0 | ? |
| Y | 21 | 26 | 28 | 30 | 32 | ? |
| Point position | Weld seam | Toe of weld | The heat affected zone | The heat affected zone | The heat affected zone | ? |
| σx | -164.97 | -145.21 | -141.70 | -110.59 | -52.42 | ? |
| σy | 115.48 | -114.72 | -44.26 | -150.18 | -24.18 | ? |
| |
5 | 5 | 5 | 5 | 5 | 5 |
| Y | 0 | 2 | 4 | 6 | 11 | 16 |
| Point position | The heat affected zone | The heat affected zone | The heat affected zone | Toe of weld | Weld seam | Weld seam |
| σx | -75.91 | -101.80 | -164.83 | -198.24 | -151.07 | -139.43 |
| σy | -24.43 | -47.10 | -72.42 | -145.11 | -151.96 | -158.16 |
| |
5 | 5 | 5 | 5 | 5 | ? |
| Y | 21 | 26 | 28 | 30 | 32 | ? |
| Point position | Weld seam | Toe of weld | The heat affected zone | The heat affected zone | The heat affected zone | ? |
| σx | -246.10 | -143.87 | -75.91 | -101.80 | -164.83 | ? |
| σy | -186.10 | -63.23 | -24.43 | -47.10 | -72.42 | ? |
| |
10 | 10 | 10 | 10 | 10 | 10 |
| Y | 0 | 2 | 4 | 6 | 11 | 16 |
| Point position | The heat affected zone | The heat affected zone | The heat affected zone | Toe of weld | Weld seam | Weld seam |
| σx | -140.87 | -96.36 | -58.85 | -53.69 | -168.47 | -70.54 |
| σy | -28.67 | -127.14 | -63.94 | 39.88 | -198.88 | -147.99 |
| |
10 | 10 | 10 | 10 | 10 | ? |
| Y | 21 | 26 | 28 | 30 | 32 | ? |
| Point position | Weld seam | Toe of weld | The heat affected zone | The heat affected zone | The heat affected zone | ? |
| σx | -198.10 | -170.19 | -56.82 | -81.58 | -118.117 | ? |
| σy | -95.91 | -55.22 | -51.71 | -13.57 | -61.80 | ? |
The present embodiment is about eliminating the treatment measures of bullet train aluminium alloy unrelieved stress.
The present embodiment eliminate the welding joint unrelieved stress the welding joint test specimen adopt the thick 5XXX mother metal of bullet train Aluminium Alloys in Common Use 6mm, adopt manual MIG to weld, the postwelding sample dimensions is 300 * 220 * 12mm, weld width is 20mm.The frequency of ultrasonic impact equipment is transferred to 19150Hz, and amplitude transfers to 50 μ m, and the employing rush current is 1.6A, and whole weld seam is impacted.The toe of weld zone adopts cross section " circle " ultrasonic impact head to process, and Seam and heat effected zone territory employing cross section " bar shaped " ultrasonic impact head is processed.All do not make fatigue criteria sample (as shown in Figure 2) according to national standard with doing the ultrasonic impact welding joint of processing and the welding joint that carries out the ultrasonic impact processing, and adopt PLG-100 microcomputer control HF fatigue testing machine that it is carried out fatigue property test and compares.Sample is placed on HF fatigue testing machine, carry out fatigue loading, loading environment is: room temperature, R=0.1, the variation of loading force is by sinusoidal variation, measure respectively 140MPa, 130MPa, 120MPa, 110MPa, 100MPa, 90MPa and 80MPa loading welded joints in aluminium alloy is measured the fatigue lifetime under different states, draw accordingly S-N curve (see figure 3).
To the sample safe range of stress before and after Charpy, the sample before impacting just can reach 10 when being loaded into 90MPa
7Inferior, and reach 10 through overbump sample cycle number of times later
7Inferior fatigue strength is 110MPa, has improved 22.2%.And when loading identical fatigue strength, the fatigue life cycle of process shock treatment sample later can significantly improve the fatigue lifetime of welding joint all higher than the sample without overbump through ultrasonic impact.
Embodiment 3
Embodiment eliminate the welding joint unrelieved stress the welding joint test specimen adopt bullet train Aluminium Alloys in Common Use 7XXX mother metal, adopt manual MIG to weld, the postwelding sample dimensions is 300 * 220 * 12mm, weld width is 20mm.
Ultrasonic impact is processed and to be carried out for weld seam is region-wide, and the frequency of ultrasonic impact equipment is transferred to 19150Hz, and amplitude transfers to 50 μ m.The toe of weld zone adopts " circle " ultrasonic impact head to process, and Seam and heat effected zone territory employing plain film shape ultrasonic head is processed.The exciting current of ultrasonic impact is at 2.2A, and the attack time is 30-60min.The test specimen of above-mentioned technique is carried out the x-ray diffraction experiment analysis, be of a size of the coupon of 10mm * 10mm * 4mm in the specimen surface intercepting.To through the face of ultrasonic impact with No. 120 sand paperings substantially to polish and to remove the surface alclad floor, then use No. 400, No. 800 sand paper is levigate with specimen surface.With sample ultrasonic cleaning 15min, the sample bag of packing into numbering also scans (pipe flows 25mA for Cu target, pipe pressure 35kV, and step-length is 0.02 °/s, 20 ° to 90 °) with the step-scan pattern.The X diffract spectral line is analyzed, experimental result such as Fig. 4, spectral line is respectively 30min from bottom to up, 40min, 45min, 50min, 60min.Can see, along with the increase of ultrasonic impact time, its diffraction peak moves to wide-angle gradually, and the peak descends by force and diffraction peak produces broadening.
According to the X-ray diffraction principle, under nanoscale, except the broadening that instrument itself causes, mainly cause diffraction peaks broadening by grain refining and lattice distortion.And after ultrasonic impact, violent viscous deformation has occured in the test specimen surface metal, and crystal grain is refinement gradually, and has produced microstress on the shock zone surface, causes the lattice distorted.The grain refining of test specimen surface microstructure and lattice distortion cause the broadening at X-ray diffraction peak can be respectively to strangle equation and Wilson equation is expressed as follows respectively with thanking:
β
2(2θ)=4εtanθ
Wherein θ is Prague input angle, and d is multicrystal median size, and λ is the wavelength of incident X-rays, and ε is microstrain.
During analytical data, use MDI JADE5, JADE is the relation of residual strain and grain-size that calculates by the W-H model, and the slope of the straight line that obtains is the twice of each crystal face residual strain, and with the intercept of Y-axis be the inverse of each crystal face average grain size.I=1.6A, t=45min, draw out curve such as Fig. 5: have this figure as can be known average grain size be 37.8nm.Microstrain is 0.135%.After can seeing that above technique is impacted, average grain size obviously reduces with respect to the average grain size of the inner surperficial 1mm of test specimen, and microstrain increases to some extent.
Claims (4)
1. the treatment process of bullet train aluminum alloy welding connecting structure, it is characterized in that it comprises the steps: one, belongs to weld seam, toe of weld, heat affected zone, four kinds of situations selection ultrasonic impact pressure heads of the full welded seam area of mother metal for the weld, the cross section of described ultrasonic impact pressure head is " bar shaped " or " circle "; Being " bar shaped " ultrasonic impact pressure head for weld seam and toe of weld selection cross section, is " circle " ultrasonic impact pressure head for heat affected zone and the full welded seam area selection of mother metal cross section; Two, the ultrasonic impact pressure head of choosing is assembled on ultrasonic impact equipment; Three, opening ultrasonic impact equipment the shock treatment of position is one by one carried out on the surface of aluminum alloy welding connecting structure, evenly arranges and is adjacent in each position of shock treatment, forms the nanometer layer of 10 μ m on the surface of aluminum alloy welding connecting structure.
2. the treatment process of bullet train aluminum alloy welding connecting structure according to claim 1, is characterized in that described ultrasonic impact equipment is that bold and unconstrained gram can the ultrasonic impact treatment facility.
3. the treatment process of bullet train aluminum alloy welding connecting structure according to claim 2, it is characterized in that operating frequency that described bold and unconstrained gram can the ultrasonic impact treatment facility 19 to 21kHz, to 1100W, amplitude is at 40 to 60 μ m 800 for operating power.
4. the treatment process of bullet train aluminum alloy welding connecting structure according to claim 3, it is characterized in that exciting current 1 to 3A, after processing, joint surface produces stress, the degree of depth that affects of unrelieved stress reaches 3mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103457421A (en) * | 2013-10-09 | 2013-12-18 | 南车株洲电机有限公司 | Method for eliminating stress of silicon steel sheet laminated motor base by means of efficient and high energy |
| CN105953960A (en) * | 2016-04-19 | 2016-09-21 | 苟国庆 | Database establishing method and database use method of database for evaluating train body safety |
| CN107447080A (en) * | 2017-09-22 | 2017-12-08 | 哈尔滨工业大学 | A kind of quick, welded seam of aluminium alloy local stress relaxation method of low temperature |
| CN107803630A (en) * | 2017-10-30 | 2018-03-16 | 上海振华重工启东海洋工程股份有限公司 | A kind of cutter suction dredger trunnion base steel-casting welding procedure |
| CN108362561A (en) * | 2018-02-02 | 2018-08-03 | 上海理工大学 | A kind of weld seam and the material mechanical performance of welding heat affected zone determine method |
| CN112251596A (en) * | 2020-09-09 | 2021-01-22 | 中冶建筑研究总院有限公司 | Method for improving fatigue performance of steel plate and butt-welded joint |
| CN112680682A (en) * | 2020-12-16 | 2021-04-20 | 中国兵器科学研究院宁波分院 | Surface treatment method of aluminum alloy welding piece |
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2012
- 2012-12-27 CN CN2012105787334A patent/CN103131975A/en active Pending
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| 陈健等: "超声冲击工艺对铝合金焊接接头残余应力的影响", 《江苏科技大学学报(自然科学版)》 * |
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| CN103457421A (en) * | 2013-10-09 | 2013-12-18 | 南车株洲电机有限公司 | Method for eliminating stress of silicon steel sheet laminated motor base by means of efficient and high energy |
| CN105953960A (en) * | 2016-04-19 | 2016-09-21 | 苟国庆 | Database establishing method and database use method of database for evaluating train body safety |
| CN105953960B (en) * | 2016-04-19 | 2018-07-06 | 西南交通大学 | A kind of foundation of database for being used to evaluate train body safety and application method |
| CN107447080A (en) * | 2017-09-22 | 2017-12-08 | 哈尔滨工业大学 | A kind of quick, welded seam of aluminium alloy local stress relaxation method of low temperature |
| CN107803630A (en) * | 2017-10-30 | 2018-03-16 | 上海振华重工启东海洋工程股份有限公司 | A kind of cutter suction dredger trunnion base steel-casting welding procedure |
| CN108362561A (en) * | 2018-02-02 | 2018-08-03 | 上海理工大学 | A kind of weld seam and the material mechanical performance of welding heat affected zone determine method |
| CN108362561B (en) * | 2018-02-02 | 2020-06-09 | 上海理工大学 | Method for determining mechanical properties of materials of welding seam and welding heat affected zone |
| CN112251596A (en) * | 2020-09-09 | 2021-01-22 | 中冶建筑研究总院有限公司 | Method for improving fatigue performance of steel plate and butt-welded joint |
| CN112680682A (en) * | 2020-12-16 | 2021-04-20 | 中国兵器科学研究院宁波分院 | Surface treatment method of aluminum alloy welding piece |
| CN112680682B (en) * | 2020-12-16 | 2022-04-12 | 中国兵器科学研究院宁波分院 | Surface treatment method of aluminum alloy welding piece |
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Application publication date: 20130605 |