Root Cause Analysis of Tube Weld Failure of the Lubrication Oil Cooling Tube in Thrust Bearing of Pump

Myung Hwan Boo; Chi Yong Park

doi:10.4028/www.scientific.net/KEM.326-328.1247

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Tensile Damage Characterization in Nicalon Fiber Reinforced Ceramic Composites
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The Predictions of the Fretting Wear between Supporting Grids and Cladding Tubes of Nuclear Fuel Rod
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Root Cause Analysis of Tube Weld Failure of the Lubrication Oil Cooling Tube in Thrust Bearing of Pump
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The Experiment Study on the Shielded Charge Initiated by the High Speed Fragment
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A Study on Sealing Mechanism of Butterfly Valve
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Root Cause Analysis of Tube Weld Failure of the Lubrication Oil Cooling Tube in Thrust Bearing of Pump

Abstract:

Dissimilar weld region located at the cooling tube of pump was damaged and failed. We performed a root cause analysis using the Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy for the fractured surface. Many internal defects were shown in the fracture section. Root cause analysis shows that the failure is due to welding at higher temperature over 1000. This was confirmed by high-temperature cracks observed with SEM. In this study Failure scenario including initial crack generation, propagation of corrosion cracks and final failure, has been constructed and verified.