Effect of Laser Power on Temperature Field and Joint Microstructure and Properties in Laser-MIG Hybrid Welding of Q890 Steel

ZHANG Shenglin; YAN Chunyan; ZHOU Lingchuan; TIAN Zhanpeng; LIU Xinyi; LIANG Jijian

doi:10.7512/j.issn.1001-2303.2026.08.13

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Effect of Laser Power on Temperature Field and Joint Microstructure and Properties in Laser-MIG Hybrid Welding of Q890 Steel
Vol. 56, Issue 8, Pages: 123-132(2026)
Received：14 July 2025，

Revised：2026-01-29，

Published：20 August 2026
DOI： 10.7512/j.issn.1001-2303.2026.08.13
稿件说明：

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张盛林，严春妍，周凌川，等.激光功率对Q890钢-MIG复合焊接温度场及接头组织与性能的影响［J］.电焊机，2026，56（8）：123-132. DOI： 10.7512/j.issn.1001-2303.2026.08.13.

ZHANG Shenglin, YAN Chunyan, ZHOU Lingchuan, et al.Effect of Laser Power on Temperature Field and Joint Microstructure and Properties in Laser-MIG Hybrid Welding of Q890 Steel[J].Electric Welding Machine, 2026, 56(8): 123-132. DOI： 10.7512/j.issn.1001-2303.2026.08.13.

摘要

为探究激光功率对16 mm厚Q890高强钢激光-MIG复合焊接温度场、接头显微组织及硬度的影响规律，采用双椭球+柱状复合热源模型，基于SYSWELD软件建立了多层多道焊接温度场有限元模型。系统研究了打底焊和盖面焊激光功率变化对焊接热循环特征、接头显微组织演变及硬度分布的影响。温度场模拟结果显示，打底焊激光功率从6.0 kW增加到7.0 kW时，打底焊焊接熔池最高温度达到2 013 ℃；盖面焊激光功率从2.0 kW增加到3.0 kW时，盖面焊焊接熔池最高温度达到2 631 ℃。盖面焊激光功率为2.0 kW时，盖面焊激光区焊缝的显微组织主要为针状铁素体、粒状贝氏体和少量条状贝氏体，粗晶热影响区显微组织主要由板条马氏体和条状贝氏体组成。打底焊激光功率为6.0 kW时，打底层激光区焊缝的显微组织主要为板条马氏体，粗晶热影响区的显微组织主要由板条马氏体和条状贝氏体构成。随着激光功率的增加，焊接熔池峰值温度增加，盖面焊激光区焊缝贝氏体含量减少，打底焊激光区焊缝形成了条状贝氏体，粗晶热影响区晶粒尺寸增大。

Abstract

To investigate the effects of laser power on the temperature field

joint microstructure

and hardness distribution in laser-MIG hybrid welding of 16 mm thick Q890 high-strength steel

a finite element model for multi-pass welding temperature field was established using a combined double-ellipsoid and columnar heat source model based on SYSWELD software. The influences of root weld laser power and cap weld laser power on thermal cycle characteristics

microstructural evolution

and hardness distribution of the welded joints were systematically studied. The temperature field simulation results show that when the laser power for the root weld increases from 6.0 kW to 7.0 kW

the maximum temperature of the weld pool reaches 2 013 ℃. For the cap weld

when the laser power increases from 2.0 kW to 3.0 kW

the maximum temperature of the weld pool reaches 2 631 ℃. When the laser power for the cap weld is 2.0 kW

the microstructure in the laser zone consisted mainly of acicular ferrite

granular bainite

and a small amount of banded bainite

while the coarse grained heat affected zone (CGHAZ) is mainly composed of lath martensite and lath bainite. When the laser power for the root weld is 6.0 kW

the microstructure of the laser weld zone in the root weld primarily consists of lath martensite

while the microstructure of the CGHAZ is mainly composed of lath martensite and lath bainite. The results indicate that with increasing laser power

the peak temperature of the welding pool increases

the bainite content in the laser weld zone of the cap weld decreases

the lath bainite forms in the laser weld zone of the root weld

and the grain size in the CGHAZ increases.

关键词

Keywords

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