Abstract

This paper investigates the impact of defects on similar sheets and dissimilar sheets used in the automotive industry. Spot welding is one of the types of resistance welding used in this experiment for sheet welding. The thickness of sheets welded by the spot welding method can be between 0.5 and 3 mm. In this paper, the simulation is performed by finite element method for non-destructive tests on spot welding. This study investigated the propagation of ultrasonic waves in two similar layers of stainless steel and galvanized stainless steel sheets and two dissimilar layers of stainless steel sheets and galvanized stainless steel sheets in different thicknesses. This test was performed by ultrasonic immersion method and the intensity and amplitude of the reaction of the resulting defect waves and its effect on the results were also investigated. Due to the performance of finite element method softwares, Comsol Multiphysics software because of its high accuracy used. It has been studied various factors and conditions including excitation frequency, boundary conditions, the most suitable position for the probr Fto stimulate the waves, focused or unfocused waves in the simulation, sensitivity analysis of mesh size and appropriate mesh size for simulation. In this paper, the joint of similar sheets and dissimilar sheets is investigated. For this performance, the average relative error that can meet the industrial requirement is mentioned. The results of the simulation with the results of the experimental test They were compared and investigated And with the amount of error tests, have acceptable results and it can be used with the error specified and can meet the needs of the automotive industry.

中文翻译：

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相似板和不同板超声检测点焊缺陷的数值和实验建模

摘要

本文研究了缺陷对汽车行业中使用的相似板和异种板的影响。点焊是该实验中用于薄板焊接的电阻焊类型之一。通过点焊方法焊接的板的厚度可以在0.5和3mm之间。本文采用有限元方法对点焊的无损检测进行了仿真。这项研究调查了超声波在两层相似的不锈钢和镀锌不锈钢板以及两层不同的不锈钢板和镀锌不锈钢板的不同厚度中的传播情况。通过超声波浸没法进行该试验，并且研究了所产生的缺陷波的反应的强度和幅度以及对结果的影响。由于有限元方法软件的性能，Comsol Multiphysics软件因其使用的准确性很高。已经研究了各种因素和条件，包括激励频率，边界条件，prof F刺激波的最合适位置，模拟中聚焦或未聚焦的波，网眼尺寸的灵敏度分析以及用于仿真的适当网眼尺寸。在本文中，研究了相似薄片和异种薄片的连接。为此，提到了可以满足工业要求的平均相对误差。模拟的结果与实验测试的结果进行了比较和研究，并进行了误差测试，