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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:

2025年6期

Page:

124-134

Research Field:

桥梁智能运维与防灾减灾

Publishing date:

Info

Title:

Determining method for shape parameters of dual-ellipsoidal heat source model

Author(s):

LIU Xiao-guang¹; 2;  ZHU Wei-qing¹;  YU Qi¹;  FAN Yong-hui²;  ZHOU Bo¹;  WANG Hao²

(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. SCEGC Mechanized Construction Group Co., Ltd., Xi'an 710032, Shaanxi, China)

Keywords:

bridge engineering;  dual-ellipsoidal heat source;  shape parameter;  welding temperature field;  molten pool dimension

PACS:

U445

DOI:

-

Abstract:

To accurately determine the welding temperature field of steel structures and precisely predict the welding stress and deformation during welding process, a determining and predicting method for shape parameters of dual-ellipsoidal heat source model was proposed. The T-joint welding test of steel truss joints was conducted to obtain the molten pool dimensions and measuring point temperature fields, and the simulation model was established. The influences of heat source shape parameters on temperature measuring points at different distances were investigated, and the value of heat source thermal efficiency was determined. Objective functions were established based on the peak temperature of measuring points and molten pool dimensions. Error weight coefficients were defined according to the influence of heat source on measuring points at different distances, the constraint conditions of heat source shape parameters were set, and a multi-objective determination mathematical model for heat source parameters was constructed. Simulation tests were designed within the constraint conditions. The test and simulation results were calculated according to the objective functions. The heat source shape parameters were taken as independent variables, and the objective function calculation results were taken as dependent variables to fit the error-heat source dimension function. The optimal heat source shape parameters were determined when the dependent variable was minimal. On this basis, prediction regression curves for heat source shape parameters were fitted. The research results show that when the heat source thermal efficiency remains constant, the closer a measurement point is to the heat source, the larger the temperature error of the measuring point, and the smaller the influence of heat source dimension on temperature. The greater the influence of heat source on measurement points at different distances, the greater the error weight coefficient. The maximum errors between the simulated peak temperature and molten pool dimensions according to the optimal heat source shape parameters and the measured values are 2.38% and 5.62%, respectively. The maximum error between the predicted heat source shape parameters and the simulated test design values is 6.92%. It can be seen that the proposed determining method for shape parameters of dual-ellipsoidal heat source model has a high accuracy and can greatly simplify the shape parameter solving process.6 tabs, 14 figs, 31 refs.

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Memo

Memo:

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Common functions

Last Update: 2025-12-20