摘要
为研究激光焊接工艺对TA4焊缝成形的影响,对厚度4.5 mm的TA4板材进行光纤激光焊接,分析了激光功率、焊接速度和离焦量对焊缝形貌的影响。试验结果表明,焊缝背面熔宽随着激光功率的增大而增大,但正面焊缝存在熔宽的无规则波动,说明激光功率密度处于熔透阈值附近时焊接过程存在激光深熔焊和热导焊间来回跳变的焊接不稳定现象;随着焊接速度的增大,焊缝正面熔宽逐渐减小,板材过渡到焊透状态过程中熔宽无规则地波动发生于背面焊缝;焊缝熔宽随离焦量减小表现为先增大后减小,负离焦能改善能量密度阈值附近的焊接不稳定现象。
In order to study the influence of laser welding parameters on the macro morphology of TA4 welded joints,the TA4 plate with 4.5 mm thickness was welded by laser welding.The single factor experimental method was used to study the effects of different laser process parameters such as laser power,welding speed,and defocus on the weld morphology.The experimental results show that the weld width on the back of the weld increases with the rising of laser power,but there is an irregular fluctuation of the weld width on the front weld.This confirms that when the laser power density is near the penetration threshold,there is a instability phenomenon on appearance of weld.As the welding speed increases,the fusion width on the front side of the weld gradually decreases,and the irregular fluctuation of fusion width occurs on the back side of the weld during the transition of the plate to the fully penetrated state.The weld fusion width first increases and then decreases with the decrease of defocusing amount,and negative defocusing can improve the welding instability near the energy density threshold.
作者
董志伟
唐定狼
张建勋
DONG Zhiwei;TANG Dingang;ZHANG Jianxun(Xi'an Jiaotong University,State Key Laboratory of Mechanical Behavior for Materials,Xi'an 710049,China)
出处
《焊管》
2024年第2期24-28,共5页
Welded Pipe and Tube
基金
国家自然科学基金项目“双金属层状材料共熔池激光穿透焊物理机制及‘三明治夹层’接头组织性能调控研究”(项目编号51875442)。
