Research on Welding Repair for Reheating Hot Pipe Elbow of 325MW Station Boiler

Xiang Feng Zheng; Qing Wang; Yan Ting Feng; Xiao Guang Niu; Xiao Jun Hao; Wen Bin Li; Xue Xia Xu; Peng Sun

doi:10.4028/www.scientific.net/AMR.516-517.414

Paper Titles

Research on Heat Transfer and Environmental Impact of Horizontal Ground Heat Exchangers in Multi-Grooves
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Research on Technology of Blast Furnace Optimization of Operation Principle
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Research on the Dust Deposition and Corrosion Problems in Heating Surface at the Rear of Oil-Fired Boiler
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Research on Trait in Heat Exchange and Flow of Inner Single-Phase Currentin Micro Channel
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Research on Welding Repair for Reheating Hot Pipe Elbow of 325MW Station Boiler
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Sensitivity Analysis for Shell-and-Tube Heat Exchangers Based on Entropy Production
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Sensitivity Analysis for the Junction Temperature Measurement of the LED 12
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Simulation and Analysis on Heat Transfer Performance of Oscillating Heat Pipe with Single and Double Passageway
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Simulation and Investigation on Exergy Destruction Distribution in Single-Phase Heated Surfaces of Boiler under Transient Conditions
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Research on Welding Repair for Reheating Hot Pipe Elbow of 325MW Station Boiler

Abstract:

Through methods, such as microscope analysis, metallographic examination, the crack located nearby the fusion line between reheating hot pipe elbow and blocking valve is reheat crack. The base metal material and excessive welding residual stress are the primary inducement of crack. In replacing pipe elbow, the measures of reducing residual stress, such as hammer blowing ,lower welding heat input, post welding heat treatment and so on, were taken. The welding repair succeeded greatly.