华南理工大学学报(自然科学版) ›› 2025, Vol. 53 ›› Issue (6): 1-11.doi: 10.12141/j.issn.1000-565X.240357

• 土木建筑工程 •    下一篇

激光重熔处理对钢结构焊接接头疲劳性能的影响

康澜1 李荣文1 苏竞裕1 冯磊2   

  1. 1. 华南理工大学 土木与交通学院,广东 广州 510640

    2. 中建三局第三建设工程有限责任公司,湖北 武汉 430000

  • 出版日期:2025-06-25 发布日期:2024-09-27

Influence of Laser Remelting Treatment on the Fatigue Performance of Steel Structure Welding Joints

KANG Lan1  LI Rongwen1  SU Jingyu1 FENG Lei2   

  1. 1.School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, Guangdong, China; 
    2. The Third Construction Engineering Co., Ltd of China Construction Third Engineering Bureau, Wuhan 430000, Hubei, China
  • Online:2025-06-25 Published:2024-09-27

摘要:

焊接作为钢结构连接的重要手段,焊接接头的疲劳性能关系到钢结构的安全。为了提高钢结构焊接接头的疲劳性能,本研究提出采用激光重熔处理焊接接头。为此,本研究开展了Q355钢板对接焊接的焊态接头与激光重熔处理接头的高周疲劳试验,通过扫描电子显微镜进行了疲劳断口分析,根据试验结果拟合了焊态焊接接头与激光重熔焊接接头的应力-寿命(S-N)疲劳曲线,并与规范疲劳公式进行了对比。试验结果表明:激光重熔处理可以改变焊接接头疲劳断裂的位置,并显著提升焊接接头的疲劳寿命;与规范对比结果表明,美国钢结构规范ANSI/AISC360-22、欧洲规范EN 1993-1-9:2005和海上钢结构设计推荐方法DNV-RP-C203给出的疲劳性能设计曲线对于激光重熔处理的焊接接头疲劳性能均偏于保守。

关键词: 焊接接头, 激光重熔, 高周疲劳, 疲劳强度, 疲劳断口

Abstract: Welding is an important means of connecting steel structures, and the fatigue performance of welded joints is related to the safety of steel structures. In order to improve the fatigue performance of welded joints in steel structures, this study proposes to use laser remelting to treat welded joints. For this purpose, this study conducted high cycle fatigue tests on the welded joints and laser remelting treated joints of Q355 steel plate butt welding. Fatigue fracture analysis was conducted using scanning electron microscopy, and the stress life (S-N) fatigue curves of the welded joints and laser remelting welded joints were fitted based on the test results, and compared with the standard fatigue formula. The experimental results show that laser remelting treatment can change the location of fatigue fracture in welded joints and significantly improve the fatigue life of welded joints; The fatigue performance design curves provided by the American Steel Structure Code ANSI/AISC360-22, European Code EN 1993-1-9:2005, and Recommended Method for Offshore Steel Structure Design DNV-RP-C203 tend to be conservative for welded joints treated with laser remelting.


Key words: welding joints, laser remelting, high cycle fatigue, fatigue strength, fatigue fracture surface