李磊,黄永德,熊剑.Ta/Ni/Mo异种薄板激光熔钎焊正交试验探究[J].精密成形工程,2018,10(5):74-80.
LI Lei,HUANG Yong-de,XIONG Jian.Ta/Ni/Mo Laser Brazing of Different Thin Plates[J].Journal of Netshape Forming Engineering,2018,10(5):74-80. |
| Ta/Ni/Mo异种薄板激光熔钎焊正交试验探究 |
| Ta/Ni/Mo Laser Brazing of Different Thin Plates |
| 投稿时间：2017-07-10 修订日期：2018-09-10 |
| DOI：10.3969/j.issn.1674-6457.2018.05.013 |
| 中文关键词: 正交试验 激光溶钎焊 稀有金属 |
| 英文关键词: orthogonal design laser soldering rare metals |
| 基金项目:江西省重点研发计划（20171BBE50010） |
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| 中文摘要: |
| 目的 探究Ta/Mo异种薄板激光熔钎焊的最佳焊接工艺参数。方法 设计正交试验方案，得出理论最优工艺参数。采用SL-08型Nd: YAG脉冲激光焊机对薄板完成焊接得到焊接接头；通过微机控制电子万能试验机测试焊接接头的抗拉强度；通过显微硬度计测量焊接接头显微硬度；通过OM测试方法观察焊缝组织。并通过焊接接头的性能对得出的最优工艺参数进行验证。结果 在最佳焊接工艺参数下，接头的最大平均抗拉强度为230 MPa，接近Ta母材的抗拉强度，拉伸试样断裂发生在近Ta热影响区；焊缝表面连续，可看到清晰的鱼鳞纹，焊缝背面宽度均匀，焊缝成形良好；焊缝中心区域出现了针状共晶组织，热影响区的晶粒都呈现不同程度的长大现象；形成接头的焊缝区硬度最高，钼母材次之，钽母材最小。结论 通过正交试验得出的最优工艺参数是准确的，Ta/Mo异种薄板最佳焊接工艺参数为：激光功率P为20.8 W（激光功率百分比为26%），脉宽T为5.5 ms，脉冲频率f为4.0 Hz。 |
| 英文摘要: |
| The work aims to explore the optimal welding process parameters for Ta/Mo laser fusion brazing. The orthogonal test scheme was designed and the optimal technological parameters were obtained. SL-08 Nd: YAG pulse laser welding machine was used to weld the thin plate to get the welded joint. The tensile strength of the welded joint was tested by controlling electronic universal testing machine. Microhardness of welding joint was measured by microhardness tester. Weld microstructure was observed by OM test. The optimum process parameters were verified by the performance of the welded joint. Under the optimal welding process parameters, the maximum average tensile strength of the joint was 230 MPa, which was close to the tensile strength of Ta parent material. The weld surface was continuous and clear fish-scale pattern could be seen. The back width of the weld was uniform, and the weld was well formed. The acicular eutectic structure appeared in the center of the weld seam, and the grains in the heat affected zone were grown up to different degrees. The hardness of weld zone formed joint was the highest, followed by molybdenum base and tantalum base. The optimal process parameters obtained by the orthogonal experiment are accurate, and the optimal welding process parameters of Ta/Mo heterogeneous thin plates are: laser power P is 20.8 W (laser power percentage is 26%), pulse width T is 5.5 ms, and pulse frequency f is 4.0 Hz. |
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