Study on the Welding Process and Microstructural Properties of 800 MPa-Grade High-Strength Steel for Hydropower Applications Using Laser-Arc Hybrid Welding

PENG Xingna; QIAO Yaxia; ZHANG Hao; ZHAO Hanxue

doi:10.7512/j.issn.1001-2303.2025.06.06

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Study on the Welding Process and Microstructural Properties of 800 MPa-Grade High-Strength Steel for Hydropower Applications Using Laser-Arc Hybrid Welding
Vol. 55, Issue 6, Pages: 42-48(2025)
Received：28 February 2025，

Revised：08 April 2025，

Published：20 June 2025
DOI： 10.7512/j.issn.1001-2303.2025.06.06
稿件说明：

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彭杏娜，乔亚霞，张浩，等.800 MPa级水电用高强钢激光-电弧复合焊接工艺及组织性能研究［J］.电焊机，2025，55（6）：42-48. DOI： 10.7512/j.issn.1001-2303.2025.06.06.

PENG Xingna, QIAO Yaxia, ZHANG Hao, et al.Study on the Welding Process and Microstructural Properties of 800 MPa-Grade High-Strength Steel for Hydropower Applications Using Laser-Arc Hybrid Welding[J].Electric Welding Machine, 2025, 55(6): 42-48. DOI： 10.7512/j.issn.1001-2303.2025.06.06.

摘要

针对800 MPa级水电用高强钢N800CF，提出一种激光-电弧复合焊接工艺，以优化厚板焊接质量和力学性能。采用双面窄间隙焊接技术，对32 mm厚N800CF钢板进行焊接，并分析焊缝成形、微观组织及力学性能。结果表明，焊缝成形良好，无气孔或未熔合缺陷。焊缝组织以板条马氏体为主，伴有少量贝氏体，钝边部位焊缝及热影响区存在M-A组元。钝边、填充部位焊缝及热影响区的平均晶粒尺寸分别为20 μm、33 μm和42 μm。力学测试显示，钝边部位和填充部位强度分别为798 MPa和805 MPa，抗拉强度822 MPa和828 MPa，断后延伸率11%和12%，冲击功79 J和115 J。焊缝抗拉强度高于母材，但延展性和冲击韧性有所降低。本研究证实激光-电弧复合焊接可有效改善焊接质量，为水电高强钢厚壁焊接提供了重要的参考。

Abstract

This study investigates a laser-arc hybrid welding process for 800 MPa-grade high-strength steel (N800CF) used in hydropower applications

aiming to optimize the welding quality and mechanical properties of thick plates. A double-sided narrow-gap welding technique was employed to weld 32 mm-thick N800CF steel plates

and the weld formation

microstructure

and mechanical properties were systematically analyzed.The results indicate that the welds exhibited good formation without defects such as porosity or lack of fusion. The weld microstructure primarily consisted of lath martensite with a small fraction of bainite

while M-A constituents were observed in the weld root and heat-affected zone (HAZ). The average grain sizes in the weld root

filler weld

and HAZ were 20 μm

33 μm

and 42 μm

respectively. Mechanical testing showed that the yield strengths of the weld root and filler weld were 798 MPa and 805 MPa

respectively

while their tensile strengths were 822 MPa and 828 MPa. The elongation after fracture was 11% and 12%

and the impact energy was 79 J and 115 J

respectively. Although the tensile strength of the weld was higher than that of the base metal

its ductility and impact toughness were reduced.The findings demonstrate that laser-arc hybrid welding can effectively improve weld quality and joint performance

providing valuable insights for the thick-wall welding of high-strength steel in hydropower applications.

关键词

Keywords

references

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