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| Ti2AlNb合金电子束焊接头残余应力及变形的数值模拟 |
| Numerical Simulation of Residual Stress and Deformation in Electron Beam Welded Joints of Ti2AlNb Alloy |
| Received:April 18, 2023 |
| DOI：10.3969/j.issn.1674-6457.2023.08.004 |
| 中文关键词: Ti2AlNb合金 电子束焊接 数值模拟 残余应力 焊接变形 |
| 英文关键词: Ti2AlNb alloy electron beam welding numerical simulation residual stress welding deformation |
| 基金项目: |
| Author Name | Affiliation | | LI Hai-dong | AVIC Xi'an Flight Automatic Control Research Institution, Xi'an 710065, China | | XIAO Xuan | State Key Laboratory of Solidification, Northwestern Polytechnical University, Xi'an 710072, China | | LI Hao-yuan | State Key Laboratory of Solidification, Northwestern Polytechnical University, Xi'an 710072, China | | YAO Ling | AVIC Xi'an Flight Automatic Control Research Institution, Xi'an 710065, China | | FU Li | State Key Laboratory of Solidification, Northwestern Polytechnical University, Xi'an 710072, China |
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| 中文摘要: |
| 目的 研究平板对接电子束焊接过程中Ti2AlNb合金接头的残余应力及变形规律。方法 采用高斯圆柱体和高斯面组合热源模型模拟了6.6 mm厚的Ti2AlNb合金平板对接电子束焊过程，对比研究了高焊速高束流和低焊速低束流2种工艺参数下焊接接头的残余应力和变形分布规律，并用小孔法测量了焊缝中心及距焊缝中心10 mm位置的残余应力值。结果 在高焊速高束流参数下，获得了熔池体积小、熔池宽度窄(为3.62 mm)、深宽比高的焊缝;在该参数下焊缝横截面上的高应力集中区(应力在900 MPa以上)尺寸较小，其宽度仅为低焊速低束流参数下的89%;同时，在高焊速高束流参数下，焊缝法向变形最大值为0.79 mm，低于低焊速低束流参数下的0.82 mm;模拟计算所得残余应力与实测值的误差在5.64%以内。结论 高束流高焊速工艺具有热输入小、热量集中、加工效率高的特点，有助于获得高应力集中区域小、深宽比高、变形小的焊缝，比低束流低焊速工艺更具优势。 |
| 英文摘要: |
| The work aims to investigate the residual stress and deformation patterns of Ti2AlNb alloy flat plate joints during electron beam welding. The electron beam welding process of 6.6 mm thick Ti2AlNb alloy flat plate butt welding was simulated through a combined heat source model of Gaussian cylinder and Gaussian surface. A comparative study was conducted on the residual stress and deformation distribution of welded joints under two process parameters:high welding speed, high beam current, and low welding speed, low beam current. The residual stress values at the center of the weld and at a distance of 10 mm from the weld center were measured through the small hole method. The research results showed that among the two welding parameters, high welding speed and high beam current parameters could obtain welds with small pool volume, narrow pool width (3.62 mm), and high depth-to-width ratio; Under these parameters, the size of the high stress concentration zone (stress above 900 MPa) on the cross-section of the weld seam was relatively small, and its width was only 89% of the value under low welding speed and low beam current parameters; Meanwhile, the maximum normal direction deformation of the weld seam under high welding speed and high beam current parameters was 0.79 mm, which was lower than 0.82 mm under low welding speed and low beam current parameters; The error between the simulated residual stress and the measured value was within 5.64%. The high welding speed and high beam current process has the characteristics of small heat input, concentrated heat and high processing efficiency, which helps to obtain welds with small high stress concentration areas, high depth-to-width ratio and small deformation. It has more advantages than the low welding speed and low beam current process. |
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