Considering the stringent requirement of the pointing accuracy up to 2.5″ of the world’s largest full steerable radio telescope, this paper studies the welding experiment of the azimuth track of the antenna. First, the opposite deformation jig and welding process were designed for the QTT’s azimuth track. Then, the welding process was numerically simulated using a finite element model. The simulation results show that a better welding effect will be obtained by appropriately reducing the opposite force on the basis of the original. The three deformation processes of the track are regulated by the opposite deformation jig. The results show that the opposite deformation jig designed for QTT’s azimuth track can make the amount of deformation and flatness meet the design requirements. Finally, nondestructive testing was carried out to check the welding quality of the track surface and interior. The results show that there are no obvious defects in the welds of the azimuth track. The constraint jig and welding processes designed for QTT are effective and feasible.

中文翻译：

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QTT轨道焊接数值模拟与试验研究

针对目前世界上最大的全转向射电望远镜对指向精度高达2.5″的严苛要求，本文对天线方位轨道的焊接实验进行了研究。首先，针对QTT的方位轨道设计了相反的变形夹具和焊接工艺。然后，使用有限元模型对焊接过程进行数值模拟。仿真结果表明，在原来的基础上适当减小反作用力可获得更好的焊接效果。轨道的三个变形过程由相对变形夹具调节。结果表明，为QTT方位轨道设计的反变形夹具能够使变形量和平整度满足设计要求。最后，对轨道表面和内部的焊接质量进行了无损检测。结果表明，方位轨道焊缝无明显缺陷。为QTT设计的约束夹具和焊接工艺是有效可行的。