Weld failure due to vibrations can be minimized if appropriate measure is implemented to ensure forced vibration is not equal to the natural frequency of the material. This research focuses on determining the optimum butt welded joint, by analyzing the various natural frequencies and mode shape response obtained from five different types of butt joints. In this study, modal analysis was carried out using ANSYS 14.5 on two mild steel plates of dimensions 250mm by 175mm by 25mm welded together. Five different geometries of butt joints namely: single V groove butt weld, double V groove butt weld, single U groove butt weld, double U groove butt weld and square groove butt welded joints were examined. The natural frequencies and mode shape deformations obtained were compared with the natural frequency of mild steel of zero weld plate of dimension 500mm by 175mm by 25mm. Natural frequency of zero weld plate was found to be 51.549Hz, it was observed that the natural frequencies of the five joints mentioned were of close range in increasing order of 45.020Hz, 47.949Hz, 48.506Hz, 49.264Hz and 50.342Hz for square groove butt welded joint. The natural frequency of the square groove butt welded joint was observed to be closest to the zero weld plate; therefore we recommend square groove butt weld as optimum butt weld for engineering constructions because it failed the least when compared to other types of butt joints.
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机译：如果采取适当措施以确保强制振动不等于材料的固有频率，则可以将由于振动引起的焊接失败降至最低。这项研究着重于通过分析从五种不同类型的对接接头获得的各种固有频率和振型响应来确定最佳对接焊接接头。在这项研究中，模态分析是使用ANSYS 14.5在两块尺寸为250mm x 175mm x 25mm焊接在一起的低碳钢板上进行的。检验了五种不同的对接几何形状：单V型槽对接焊缝，双V型槽对接焊缝，单U型槽对接焊缝，双U型槽对接焊缝和方槽对接焊缝。将获得的固有频率和众数形状变形与尺寸为500mm x 175mm x 25mm的零焊板低碳钢的固有频率进行比较。发现零焊板的固有频率为51.549Hz，观察到提到的五个接头的固有频率在近距离内以递增的顺序依次变化，方形凹槽分别为45.020Hz，47.949Hz，48.506Hz，49.264Hz和50.342Hz。对接焊接接头。观察到方槽对接焊缝的固有频率最接近零焊板。因此，我们建议将方坡对接焊缝作为工程结构的最佳对接焊缝，因为与其他类型的对接缝相比，这种焊缝对焊缝的破坏最少。
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