Simulation and Analysis of Tempering Welding Temperature Field in Low Alloy Steel and Its Application

DU Jiajun; GUO Qianxin; YANG Han; WANG Xiaoying; CAO Zhongyou; ZHANG Jianlin

doi:10.7512/j.issn.1001-2303.2025.07.05

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Simulation and Analysis of Tempering Welding Temperature Field in Low Alloy Steel and Its Application
Vol. 55, Issue 7, Pages: 57-63(2025)
Received：08 November 2024，

Revised：2024-12-26，

Published：20 July 2025
DOI： 10.7512/j.issn.1001-2303.2025.07.05
稿件说明：

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杜佳军，郭前鑫，杨涵，等.低合金钢回火焊道焊接温度场模拟计算分析及应用［J］.电焊机，2025，55（7）：57-63. DOI： 10.7512/j.issn.1001-2303.2025.07.05.

DU Jiajun, GUO Qianxin, YANG Han, et al.Simulation and Analysis of Tempering Welding Temperature Field in Low Alloy Steel and Its Application[J].Electric Welding Machine, 2025, 55(7): 57-63. DOI： 10.7512/j.issn.1001-2303.2025.07.05.

摘要

针对低合金钢关键设备构件现场修复中焊后热处理实施困难的问题，本研究基于回火焊道焊接技术，以A217 WC6低合金钢为研究对象，采用基于双椭球热源模型的有限元方法，模拟分析关键工艺参数（热输入量、焊道搭接量、层间打磨量）对焊接温度场分布规律的影响。模拟结果表明：焊道搭接量主要影响温度场在水平方向的覆盖位置，而层间打磨量则影响其在厚度方向的覆盖位置，两者均不改变焊道本身的热量分布形态；选用

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2.53999996

2.03200006

2.5 mm和

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2.53999996

2.03200006

3.2 mm两种规格焊条，焊道搭接量控制在40%~60%、层间打磨量控制在1/3~1/2层厚，后续焊道形成的回火温度区间（500 ℃~AC1）能够有效覆盖前序焊道的粗晶热影响区（1 100 ℃~1 505 ℃），实现最佳回火效果。基于优化的工艺参数，制备的A217 WC6钢焊接接头符合工艺评定标准要求，且成功应用于某电站阀体修复，效果良好。

Abstract

Addressing the challenge of implementing post-weld heat treatment (PWHT) during on-site repair of critical low-alloy steel components

this study focuses on the temper bead welding (TBW) technique. Using A217 WC6 low-alloy steel as the research object

a finite element method based on a double ellipsoid heat source model was employed to simulate and analyze the influence of key process parameters (heat input

weld bead overlap

and interlayer grinding amount) on the distribution patterns of the welding temperature field. Simulation results indicate: weld bead overlap primarily affects the horizontal coverage position of the temperature field

while the interlayer grinding amount influences its coverage position in the thickness direction; neither alters the inherent heat distribution pattern

of the weld bead itself. When using welding rods of

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2.53999996

2.03200006

2.5 mm and

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2.53999996

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3.2 mm diameters

with the bead overlap controlled between 40% and 60% and the interlayer grinding amount maintained between 1/3 and 1/2 of the layer thickness

the tempering temperature range (500 °C to AC1) formed by subsequent weld beads effectively covers the coarse-grained heat-affected zone (CGHAZ

1100 °C to 1505 °C) of the preceding beads

achieving optimal tempering effects. Based on the process parameters optimized through simulation

the prepared A217 WC6 steel welded joint met the requirements of the process qualification standard and was successfully applied to repair a valve body in a power plant

with satisfactory results.

关键词

Keywords

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