| QTT天线轨道重力弯矩下多层多道焊角变形预测 |
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| 引用本文： | 许谦,胡广旭,董志波,许红祥,方洪渊.QTT天线轨道重力弯矩下多层多道焊角变形预测[J].焊接学报,2020,41(8):10-13. |
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| 作者姓名： | 许谦 胡广旭 董志波 许红祥 方洪渊 |
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| 作者单位： | 1.中国科学院新疆天文台，乌鲁木齐，830001 |
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| 基金项目： | 国家自然科学基金;创新人才计划;中国科学院天文台站设备更新;中国科学院青年创新促进会项目;重大仪器设备运行专项经费项目 |
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| 摘 要： | QTT (Qitai radio telescope)天线轨道每段尺寸4 000 mm × 600 mm × 200 mm，进行多层多道焊拼接时，坡口与熔敷金属量大，角变形大. 为了预测与控制变形，通过轨道缩比模型的试验与有限元分析，验证了热弹塑性耦合模型的合理性，并在有限元模型中考虑了重力的影响. 同时为解决大型QTT天线轨道结构多层多道焊模拟计算量大的问题，增加了重力弯矩影响，对多层多道焊角变形预测公式进行了修正. 结果表明，对于大型QTT天线轨道结构，重力影响因素不可忽略，且添加重力条件提高了模型角变形预测精度，为新一代大型QTT天线轨道实际装焊提供了理论指导.
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| 关 键 词： | 天线轨道 厚板 多层多道焊 角变形 |
| 收稿时间： | 2020-03-16 |
Multi-pass welding angle distortion prediction for QTT antenna track considering the bending moment of gravity |
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| Affiliation: | 1.Xinjiang Astronomical Observation, Chinese Academy of Sciences, Urumqi, 830001, China2.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi, 830011, China3.Harbin University of Commerce, Harbin, 150028, China4.State Key Laboratory of Advancd Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China |
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| Abstract: | Each block for assembling QTT antenna track is about 4 000 mm × 600 mm × 200 mm. To fabricate the track with multi-pass welding technology, it needs large groove dimension and a great amount of deposited metals, resulting large welding angle distortions. To validly predict and control the deformation, a thermal-elastic-plastic finite element model was used to simulating a scaling experiment plate considering gravity boundary condition at first. Then, another welding simulation for the actual track block structure was computed to compare with the modified formula for the welding angle distortion adding the bending moment of Gravity. The result shows that the effecting of gravity for QTT multi-pass welding was ineligible, which make the formula more accuracy. |
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