Numerical Simulation of Temperature Field and Heat-affected Zone Characteristics in Multi-layer and Multi-pass Welding of a <inline-formula><alternatives><math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mi>ϕ</mi></math><graphic specific-use="big" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="alternativeImage/4FA0D3A8-3768-49be-9998-80DFC53A7C3B-M002.jpg"><?fx-imagestate width="3.64066648" height="5.07999992"?></graphic><graphic specific-use="small" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="alternativeImage/4FA0D3A8-3768-49be-9998-80DFC53A7C3B-M002c.jpg"><?fx-imagestate width="3.64066648" height="5.07999992"?></graphic></alternatives></inline-formula>44.5 mm × 10 mm Small-Diameter G115 Steel Pipe

Jiang Haifeng; Cai Wenhe; Liu Haijiang; Zhang Mingshen; Wang Qingfeng; Zhou Hao; Chen Zhongyi

doi:10.20057/j.1003-8620.N260138

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Numerical Simulation of Temperature Field and Heat-affected Zone Characteristics in Multi-layer and Multi-pass Welding of a

ϕ

44.5 mm × 10 mm Small-Diameter G115 Steel Pipe

更新时间：2026-10-28

- Numerical Simulation of Temperature Field and Heat-affected Zone Characteristics in Multi-layer and Multi-pass Welding of a $ϕ$ 44.5 mm × 10 mm Small-Diameter G115 Steel Pipe
- Special Steel Pages: 1-7(2026)
- 作者机构：
  
  1.大唐郓城发电有限公司，郓城 274700
  2.中国大唐集团科学技术研究总院有限公司，北京 102200
  3.中国大唐集团科学技术研究总院有限公司华北电力试验研究院，北京 100040
  4.内蒙古科技大学材料科学与工程学院，包头 014010
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N260138
  CLC： TG40
- Received：09 September 2026，
  
  Revised：2026-09-16，
  
  Accepted：20 September 2026，
  
  Online First：14 October 2026，
- 稿件说明：
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姜海峰,蔡文河,刘海江等.G115钢ϕ44.5 mm×10 mm小口径管多层多道焊温度场及热影响区特征数值模拟[J].特殊钢,

Jiang Haifeng,Cai Wenhe,Liu Haijiang,et al.Numerical Simulation of Temperature Field and Heat-affected Zone Characteristics in Multi-layer and Multi-pass Welding of a ϕ44.5 mm × 10 mm Small-Diameter G115 Steel Pipe[J].Special Steel,
姜海峰,蔡文河,刘海江等.G115钢ϕ44.5 mm×10 mm小口径管多层多道焊温度场及热影响区特征数值模拟[J].特殊钢, DOI：.

Jiang Haifeng,Cai Wenhe,Liu Haijiang,et al.Numerical Simulation of Temperature Field and Heat-affected Zone Characteristics in Multi-layer and Multi-pass Welding of a ϕ44.5 mm × 10 mm Small-Diameter G115 Steel Pipe[J].Special Steel, DOI：.

Numerical Simulation of Temperature Field and Heat-affected Zone Characteristics in Multi-layer and Multi-pass Welding of a

ϕ

44.5 mm × 10 mm Small-Diameter G115 Steel Pipe

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摘要

基于ANSYS有限元平台，建立G115钢小口径管（

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=120093096&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=120093103&type=

2.03200006

2.87866688

44.5 mm×10 mm）多层多道焊三维热分析模型，采用双椭球热源和生死单元技术，模拟高、中、低三种焊接热输入（12、10、8 kJ·cm

-1

）下的瞬态温度场，研究热影响区（HAZ）热循环特征及宽度变化规律。结果表明：随热输入降低，第五层焊道熔合线附近峰值温度由1 741 ℃降至1 631 ℃，800 ℃到500 ℃冷却时间t

8/5

由24 s缩短至11 s，1 150 ℃以上停留时间由2.2 s减至1.1 s；HAZ总宽度由2.4 mm减小至1.5 mm，其中粗晶区由0.5 mm降至0.3 mm，细晶区由0.4 mm降至0.3 mm，临界相变区由0.7 mm降至0.5 mm。较小的焊接热输入可有效压缩FGHAZ和ICHAZ等薄弱区域，降低第Ⅳ型裂纹萌生风险；同时，道次增多、道次间冷却时间延长可减轻热积累。焊接热输入的选择应兼顾接头质量与焊接效率。

Abstract

Based on the ANSYS finite element platform， a three-dimensional thermal analysis model of multi-layer and multi-pass welding of a G115 steel small-diameter pipe （

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=120093096&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=120093103&type=

2.03200006

2.87866688

44.5 mm × 10 mm） was established. The double ellipsoid heat source and element birth-death technique were adopted to simulate the transient temperature field under high， medium， and low welding heat inputs （12， 10， and 8 kJ/cm）， and the thermal cycle characteristics and the HAZ width variation were investigated. The results show that with decreasing heat input， the peak temperature near the fusion line of the fifth layer decreases from 1 741 ℃ to 1 631 ℃， the cooling time from 800 ℃ to 500 ℃ （t

8/5

） shortens from 24 s to 11 s， and the residence time above 1 150 ℃ reduces from 2.2 s to 1.1 s. The total HAZ width decreases from 2.4 mm to 1.5 mm， of which the coarse-grained HAZ decreases from 0.5 mm to 0.3 mm， the fine-grained HAZ from 0.4 mm to 0.3 mm， and the intercritical HAZ from 0.7 mm to 0.5 mm. A lower welding heat input can effectively compress the weak zones such as FGHAZ and ICHAZ， reducing the risk of Type IV cracking. Meanwhile， increasing the number of passes and prolonging inter-pass cooling time can alleviate heat accumulation. The selection of

welding heat input should balance joint quality and welding efficiency.

关键词

Keywords

references

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Numerical Simulation of Temperature Field and Heat-affected Zone Characteristics in Multi-layer and Multi-pass Welding of a ϕ44.5 mm × 10 mm Small-Diameter G115 Steel Pipe

DOI：10.20057/j.1003-8620.N260138

摘要

Abstract

关键词

Keywords

references

Numerical Simulation of Temperature Field and Heat-affected Zone Characteristics in Multi-layer and Multi-pass Welding of a $ϕ$ 44.5 mm × 10 mm Small-Diameter G115 Steel Pipe