Numerical analysis on stress intensity of austenite surfacing welding crack on BFP casing

LIANG Weibing; ZHANG Jiangtao; WU Baoxin Shanghai Power Equipment Manufacture Co.

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Numerical analysis on stress intensity of austenite surfacing welding crack on BFP casing

更新时间：2025-09-28

- Numerical analysis on stress intensity of austenite surfacing welding crack on BFP casing
- Thermal Power Generation Vol. 42, Issue 2, Pages: 54-57(2013)
- 作者机构：
  
  上海电力修造总厂有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG455
- Published：2013
- 稿件说明：
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LIANG Weibing, ZHANG Jiangtao, WU Baoxin Shanghai Power Equipment Manufacture Co.. Numerical analysis on stress intensity of austenite surfacing welding crack on BFP casing[J]. Thermal power generation, 2013, 42(2): 54-57.
DOI：

LIANG Weibing, ZHANG Jiangtao, WU Baoxin Shanghai Power Equipment Manufacture Co.. Numerical analysis on stress intensity of austenite surfacing welding crack on BFP casing[J]. Thermal power generation, 2013, 42(2): 54-57. DOI：

摘要

针对给水泵筒体奥氏体堆焊层出现的裂纹

采用有限元法对装配体进行热-应力结构耦合分析

同时优化结构模型

分析螺栓孔均布半径R1和堆焊层最大外半径R2对堆焊层及筒体力学性能的影响

并利用Larson-Miller参数分析堆焊层处的老化行为。结果表明

原筒体模型堆焊层处最大应力发生在包角θ为0°的面上

且P1的最大应力值远大于P2、P3

裂纹有由螺纹孔根处向外扩展的趋势;在2×R1=685mm

2×R2=605mm时筒体结构的安全系数较高;结构优化后的筒体使用寿命大幅提高。

Abstract

Cracks appeared at austenitic surfacing layer of BFP(boiler feed pump) casing.Finite element method was adopted to conduct thermal-stress coupling simulation on the assembly body.Moreover

the structure model was optimized to study the influence of uniform distributed radius of bolt hole R1 and the maximum outer radius of surfacing welding layer R2 on surfacing layer and casing mechanical properties.Furthermore

the aging behavior of austenitic surfacing layer was investigated by Larson-Miller parameters.The results showed that

the maximum stress at surfacing layer of original casing model occurred in surface with wrap angle of 0°

and the maximum stress value of P1 is much higher than that of P2 and P3

and the crack of bolt hole extended outward;the safety coefficient of casing structure was improved dramatically when 2×R1 and 2×R2 are equal to 685 mm and 605 mm respectively(namely when the screw thread was processed on the casing without interleaving with surfacing welding);the service life of casing with improved structure was prolonged by several times.

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