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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >THERMOGRAPHIC AND ACOUSTIC IMAGING OF SPOT-WELDED AND WELD-BONDED JOINTS
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THERMOGRAPHIC AND ACOUSTIC IMAGING OF SPOT-WELDED AND WELD-BONDED JOINTS

机译：点焊和焊接接头的热成像和声像

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摘要

Stick welds, characterized by solid but weak contact, can be difficult to detect using conventional nondestructive methods, in part because of deformation of the lap joint that occurs during formation of the weld. The spot welding process deforms joint surfaces, creating gaps between the metal plates in the areas surrounding the welds. This deformation means there may be larger overall contact area at joints formed with weak welds than at joints formed with strong welds. As a result, caution must be exercised when interpreting acoustic and thermographic data because joints with very weak spot welds can conduct heat and acoustic energy as well as or better than joints with stronger welds. Nonetheless, we successfully used acoustic and thermographic scanning techniques and global resonance data to identify stick welds on spot-welded joints. A methodology developed to measure the dynamic stiffness of joints yielded data that compared well with conventional acoustic wave propagation and thermal data. Our results also demonstrate the sensitivity of global resonance methods to the stiffness of spot-welded and weld-bonded joints. Thermographic imaging techniques were successfully used to evaluate individual spot welds. Initial results obtained by applying post-processing algorithms to thermal images of spot-welded joints indicate that the quality of a spot weld can be inferred from analysis of the temperature gradients surrounding the weld. Results of thermal modeling indicate that the thermal images have sufficient resolution to allow the size of a spot weld to be determined from analysis of the gradients in the thermal images. Assuming that mechanical strength is related to the dimension of a spot-weld nugget, it may be possible to quantify the relationship between thermographic data and mechanical strength.
机译：使用传统的非破坏性方法很难检测到具有牢固但接触不良的棒焊，部分原因是在焊缝形成过程中搭接接头发生变形。点焊过程使接头表面变形，从而在焊缝周围区域的金属板之间产生间隙。这种变形意味着在弱焊缝处的总接触面积可能比在强焊缝处的总接触面积大。结果，在解释声学和热成像数据时必须谨慎，因为具有非常弱的点焊的接头可以传导热量和声能，甚至比具有较强的焊点的接头传导或更好。尽管如此，我们还是成功地使用了声学和热成像扫描技术以及整体共振数据来识别点焊接头上的棒焊。开发出一种用于测量接头动态刚度的方法，可以得出与常规声波传播和热数据相比很好的数据。我们的结果还证明了整体共振方法对点焊和焊接接头的刚度敏感。热成像技术已成功用于评估单个点焊。通过对点焊接头的热图像应用后处理算法获得的初步结果表明，可以通过分析焊缝周围的温度梯度来推断点焊的质量。热建模的结果表明，热图像具有足够的分辨率，可以根据热图像中的梯度分析确定点焊的大小。假设机械强度与点焊熔核的尺寸有关，则可以量化热成像数据与机械强度之间的关系。

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