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 Posted: Thu 14:46, 13 Jan 2011 Post subject: Moncler jacken LPG tank welding cracks scar the su |
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LPG tank welding cracks scar the surface of the magnetic memory signal
Memory technology for the detection of metal structure with a high stress concentration and stress corrosion cracking. LPG tank during operation of the maximum working pressure is generally ≯ 1MPa, so O - 1. OMPa load for the repeated load, the stress concentration at that stage a small increase, and will not produce stress release, so the magnetic memory signal amplitude and gradient are monotonic rise slowly. Tank design pressure of 1.8MPa,[link widoczny dla zalogowanych], 6a (years) ago, had its hydraulic test pressure of 2.25MPa, so 1.0 ~ 2.25MPa 6a after loading the first time, the stage of welding scar parts of the stress concentration increased rapidly, may have small areas of stress release, but will not produce a general stress release,[link widoczny dla zalogowanych], so at that stage the gradient of the magnetic memory signals increased rapidly, but why the amplitude decrease and increase generating oscillation is no reasonable explanation. Under the tank had never been> 2.25MPa load, so 2.0 - 4. OMPa overpressure loading stage loading phase, the phase of the high stress concentration zone to reach the material yield stress point of the material in the region have the local yield,[link widoczny dla zalogowanych], and to extend the crack tip passive, so that the parts of the stress concentration to be released, greatly reducing the stress concentration, the resulting magnetic memory signal amplitude and gradient with increasing pressure and rapid decline. In this stage, the acoustic emission monitoring equipment to the seven acoustic emission signal is generated in the area proof that stress release. 4. O - OMPa the unloading stage, the stress concentration must not stress release, but with the pressure drop will decrease the stress concentration, so the magnetic memory signal amplitude and gradient will decrease monotonically. 4 Conclusion (1) magnetic memory technology suitable for detecting ferromagnetic metal structure with a high stress concentration and stress corrosion cracking. (2) stress concentration in the case of no stress release, and there when the magnetic memory signal amplitude and gradient of the high ratio of no load, so load magnetic memory testing circumstances more favorable. (3) the stress in the stress concentration can cause the release of magnetic memory signal amplitude and gradient decreased rapidly, often in the stress concentration of crack initiation and propagation can cause the release of high stress, so the magnetic memory signal amplitude and gradient can only reflect detection component with a degree of stress concentration, and should not be used as indicators of the evaluation component damage. References: [1] DoubovAA. Diagnosticsofmetalitemsandequipmentbymeansofmetalmagneticmemory [A]. ProcofCHSNDT7thConferenceonNDTandInternationalResearchSymposiumEC ~. Shantou :1999.181-187. EelDoubovAA. ExplorationofmetalpropertieswithuseofeffectofmetalmagneticmemoryEJ ~. PhysicalMet-allurgyandHeatTreatmentofMetals,[link widoczny dla zalogowanych], 1997, (9). [3] DoubovAA. Diagnosticsofequipmentandconstruc-tionsstrengthwithusageofmagneticmemoryEJ ~. In-spectionDiagnostics, 2001, (6) :19 - 29. [4] of Jilin, et al. Metal magnetic memory testing technique [M]. Beijing: China Electric Power Press, 2000. [5], the first national seminar of metal magnetic memory testing technique Proceedings Ec]. Beijing: 2001. Ninth China International Material Handling & Logistics Technology Exhibition held in Shanghai, the ninth China International Material Handling & Logistics Technology Exhibition in June 2004 from 8 to 11 in Shanghai a success. During the exhibition, from 17 countries and regions, more than 300 leading domestic and foreign manufacturers, system integrators, service providers and professional firms to showcase their latest technological achievements, from 28 provinces and 18 countries nearly two million visitors visited the exhibition, the exhibition has achieved the desired results. During the exhibition,[link widoczny dla zalogowanych], the second China International Power Transmission and Control Technology Exhibition and Forum on the fifth logistics engineering activities are also held in the same manner, and further enriched the content of the show. For details of this exhibition, please visit [link widoczny dla zalogowanych] mat-test. com website
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