华南理工大学学报（自然科学版）2025，Vol.53Issue(6)：1-11,11.DOI:10.12141/j.issn.1000-565X.240357
激光重熔处理对钢结构焊接接头疲劳性能的影响
Influence of Laser Remelting Treatment on Fatigue Performance of Steel Structure Welded Joints
摘要
Abstract
As a crucial method for connecting steel structures,welding plays a vital role in ensuring structural in-tegrity,and the fatigue performance of welded joints directly affects the overall safety of steel structures.To en-hance the fatigue performance of welded joints in steel structures,this study proposed the use of laser remelting treatment on the welded joints.For this purpose,this study conducted high cycle fatigue tests on the as-welded joints and laser remelting treated welded joints of Q355 steel plate butt welding.The stress levels for high-cycle fa-tigue tests were determined through tensile tests on as-welded joints.Fatigue fracture surface analysis was con-ducted using scanning electron microscopy(SEM).Based on the experimental results,stress-life(S-N)fatigue curves were fitted for both the as-welded joints and the laser-remelted welded joints,and the results were compared with standard fatigue design curves specified in relevant codes.The experimental results show that laser remelting treatment can change the location of fatigue fracture in welded joints,prevent failure at the weld toe and thereby sig-nificantly improve the fatigue life of welded joints,with an average increase of 244%to 499%.The fatigue fracture analysis show that there were mainly ratchet crack sources and a few subsurface crack sources in the as-welded joints,and there are mainly corner crack sources and edge crack sources in the laser remelted joints;the fa-tigue 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 can be applied to the fatigue performance of as-welded joints,while these curves tend to be conservative for laser-remelted welded joints.关键词
焊接接头/激光重熔/高周疲劳/疲劳强度/疲劳断口/钢结构Key words
welded joints/laser remelting/high cycle fatigue/fatigue strength/fatigue fracture surface/steel structure分类
建筑与水利引用本文复制引用
康澜,李荣文,苏竞裕,冯磊..激光重熔处理对钢结构焊接接头疲劳性能的影响[J].华南理工大学学报（自然科学版）,2025,53(6):1-11,11.基金项目
国家自然科学基金项目(52178286)Supported by the National Natural Science Foundation of China(52178286) （52178286）
