Simulation of Welding Process of Titanium Alloy Pipe-sheet Structure based on ABAQUS

CHEN Tianxi; LU Lili; LIN Tengfei; XU Shaofeng; FENG Guocai; LIU Chengdan; CHEN Jiahao

doi:10.7512/j.issn.1001-2303.2024.09.13

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Simulation of Welding Process of Titanium Alloy Pipe-sheet Structure based on ABAQUS
Vol. 54, Issue 9, Pages: 96-104(2024)
Received：26 July 2024，

Revised：2024-08-30，

Published：25 September 2024
DOI： 10.7512/j.issn.1001-2303.2024.09.13
稿件说明：

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陈恬曦，芦丽莉，林腾飞，等.基于ABAQUS的钛合金管板焊接过程模拟仿真［J］.电焊机，2024，54（9）：96-104. DOI： 10.7512/j.issn.1001-2303.2024.09.13.

CHEN Tianxi, LU Lili, LIN Tengfei, et al.Simulation of Welding Process of Titanium Alloy Pipe-sheet Structure based on ABAQUS[J].Electric Welding Machine, 2024, 54(9): 96-104. DOI： 10.7512/j.issn.1001-2303.2024.09.13.

摘要

针对蒸汽发生单元钛合金管板焊接过程中焊接变形预测与控制问题，开展了焊接过程有限元仿真研究。基于顺序耦合的热弹塑性有限元法，采用ABAQUS对典型管板结构进行了不同焊接顺序下的焊接仿真分析，利用校核后的组合热源定义热流密度函数，计算得到焊接温度场、应力场及变形。结果显示，采用高斯热源与椭球体组合热源可以较为精确模拟熔池形貌，管板焊缝区域存在应力集中，且应力峰值位于管板被夹持区域，大小为631.2 MPa，超过材料屈服极限。单个环焊缝在不同路径下的应力分布因受到周围焊缝热输入的影响而出现复杂波动。采用从上至下的对称焊接顺序可以有效减小焊接变形量，最大变形量降幅可达24.3%，为后续工艺优化提供了参考依据。

Abstract

A finite element simulation study was conducted on the prediction and control of welding deformation during the welding process of steam generating unit. Based on the sequential coupling thermal elastic-plastic finite element method

welding process of typical pipe-sheet structures was simulated and analyzed under different welding sequences by using ABAQUS software. The welding temperature field

stress distribution

and deformation were calculated using a combined heat source verified with metallographic examination to apply heating flux. The results show that using a combination of Gaussian and ellipsoidal heat sources can accurately simulate the morphology of the melt pool. There is stress concentration in the weld area of the pipe-sheet structure

and the stress peak is located in the clamped area

with a magnitude of 631.2 MPa

exceeding the material yield limit. The stress distribution of a single circumferential weld joint along different special paths exhibits complex fluctuations due to the influence of heat input from the surrounding weld joint. Adopting a symmetrical welding sequence from top to bottom can effectively reduce welding deformation

providing a reference basis for process optimization.

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references

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