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  • Grey Repairable System Analysis

    In this paper, we systematically discuss the basic concepts of grey theory, particularly the grey differential equation and its mathematical foundation, which is essentially unknown in the reliability engineering community. Accordingly,we propose a small-sample based approach to estimate repair improvement effects by partitioning system stopping times into intrinsic functioning times and repair improvement times. An industrial data set is used for illustrative purposes in a stepwise manner....

    2020-11-22 17:58:37浏览:20 Greytheorydifferentialequationintrinsicfunctioningtimesrepair

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  • Repair welding process of friction stir welding groove defect

    The groove defect formed in the friction stir welding dramatically deteriorates weld appearances and mechanical properties of the joints owing to its larger size and penetration. Therefore, the friction stir repair welding was utilized to remove such a groove defect, and the focus was placed on the mechanical properties and microstructural characteristics of the repair joints so as to obtain an optimum repair welding process. The experimental results indicate that the groove defect can be removed by friction stir repair welding, and the offset repair welding process is superior to the symmetrical repair welding process. In the symmetrical repair welding process, a large number of fine cavity defects and an obvious aggregation of hard-brittle phase Al2Cu occur, accordingly the mechanical properties of the repair joint are weakened, and the fracture feature of repair joint is partially brittle and partially plastic. A good-quality repair joint can be obtained by the offset repair welding process, and the repair joint is fractured near the interface between the weld nugget zone and thermal-mechanically affected zone....

    2020-11-11 22:33:38浏览:34 frictionstirweldinggroovedefectrepairprocessmechanicalproperties

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  • JKD - R40A1SS 冷却循环水系统的维护和修理

    冷却循环水系统工作好坏直接影响到电镜的使用寿命,系统工作是否正常与平时做好维护是分不开的。...

    2020-11-10 09:33:08浏览:37 冷却循环水系统维护修理coolingwaterrecirculationsystemmaintenanceandrepair

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  • 气化炉失效炉体修理方案

    气化炉因工艺操作失误造成炉体意外高温蠕变破裂及变形,变形后筒体及锻件材料劣化程度及部位尚属可控状况,分析不确定因素及修复难度后,确定采取现场挖补方式进行修复,历经35d(事故发生至修复点炉)完成了计划6~7个月的检修项目。...

    2020-07-12 21:36:56浏览:29 气化炉现场挖补修理方案高温蠕变gasifiersitepatchrepairschemehightemperaturecreep

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  • 气化炉顶部烧损的现场修理

    描述了煤气化炉在运行过程中,因内衬耐火层损坏导致炉顶烧损,通过对顶部封头材料进行无损检测、金相检查、硬度测试等确定了具体烧损范围,由此制定了通过加大顶部法兰底部直径进行更换的修理方案并实施,使设备恢复了正常运行....

    2020-07-04 21:56:39浏览:1394 气化炉烧损检测修理gasifierdestructionexaminationrepair

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  • 气化炉顶部烧损的现场修理

    描述了煤气化炉在运行过程中,因内衬耐火层损坏导致炉顶烧损,通过对顶部封头材料进行无损检测、金相检查、硬度测试等确定了具体烧损范围,由此制定了通过加大顶部法兰底部直径进行更换的修理方案并实施,使设备恢复了正常运行....

    2020-03-23 18:07:41浏览:1398 气化炉烧损检测修理gasifierdestructionexaminationrepair

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