| 高功率光纤激光焊接铝合金焊缝成形特征研究 |
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| 引用本文： | 苏绍兴,于艳玲,费旺,林仕君,伍文丞,曹宇,张健,唐霞辉.高功率光纤激光焊接铝合金焊缝成形特征研究[J].激光技术,2017,41(3):322-327. |
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| 作者姓名： | 苏绍兴 于艳玲 费旺 林仕君 伍文丞 曹宇 张健 唐霞辉 |
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| 作者单位： | 1.温州职业技术学院 温州市激光应用工程技术研究中心, 温州 325036 |
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| 基金项目： | 国家自然科学基金资助项目，温州市科技计划资助项目，温州市重点科技创新团队项目资助项目，浙江省教育厅资助项目 |
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| 摘 要： | 为了探究铝合金高功率光纤激光焊接焊缝成形特征与规律，采用高斯光束与平顶光束对3mm厚5052铝合金进行激光对焊，对比分析了不同光束模式下的焊缝成形特征与激光功率、扫描速率对焊缝成形的影响。结果表明，平顶光束焊接主要为热导模式，熔池呈U型，易产生气孔、裂纹等缺陷; 高斯光束焊接有4种模式，随着激光功率和扫描速率的变化，4种模式相互转化，深熔焊模式下，熔池形貌呈“丁字”型; 扫描速率为20mm/s时，高斯光束有效深熔焊的下、上临界功率密度分别为8.8×105W/cm2和9.2×105W/cm2; 激光功率为2.7kW时，高斯光束有效深熔焊的下、上线能量分别为77J/mm和90J/mm; 在满足深熔焊所需功率密度条件下，线能量可作为激光深熔焊接的一个判据，线能量和功率密度对焊接模式与熔池形貌共同起决定性作用。
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| 关 键 词： | 激光技术 平顶光束 高斯光束 焊缝形貌 焊缝成形 |
| 收稿时间： | 2016-06-13 |
Research of characteristics of weld formation of aluminum alloy by high power fiber laser welding |
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| SU Shaoxing,YU Yanling,FEI Wang,LIN Shijun,WU Wencheng,CAO Yu,ZHANG Jian,TANG Xiahui.Research of characteristics of weld formation of aluminum alloy by high power fiber laser welding[J].Laser Technology,2017,41(3):322-327. |
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| Authors: | SU Shaoxing YU Yanling FEI Wang LIN Shijun WU Wencheng CAO Yu ZHANG Jian TANG Xiahui |
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| Abstract: | To explore characteristics and rules of weld formation of aluminum alloy by high power fiber laser welding,3mm-thick 5052 aluminum alloy was welded by laser with Gaussian and flat-topped beams respectively.The influence of weld formation characteristics,laser power and scanning speed on weld shape was analyzed comparatively.The results show that flat-top beam welding is mainly of thermal conductivity mode,and weld pool is U type,which is easy to produce pores,cracks and other defects.Gaussian beam welding has 4 modes.4 modes are transformed mutually with the change of laser power and scanning rate.Weld pool is 丁type under deep penetration mode.At scan rate of 20mm/s,the lower and upper critical power density of effective deep penetration welding of Gaussian beam are 8.8×105W/cm2 and 9.2×105W/cm2.With laser power of 2.7kW,the lower and upper critical power of effective deep penetration welding of Gaussian beam are 77J/mm and 90J/mm.Under the premise of the required welding power density,line energy can be used as the criterion of laser deep penetration welding.Line energy and power density play decisive role in welding mode and pool shape. |
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| Keywords: | laser technique flat-topped beams Gaussian beam weld appearance weld shape |
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