在上海炼油厂预加氢反应器投用前的内外部检验中，发现了大量的焊缝表面裂纹和内部埋藏裂纹。
On overall inspection of interior and exterior of pre-hydrogenating reactor of Shanghai Oil Refinery Factory, large cracks was found on the surface of weld and inside of the weld.
通过对球罐的整体应力分析，指出将焊缝布置在高应力区域是造成焊缝裂纹的重要外部因素之一。
On the basis of FEM stress analysis of a sphere tank, it can be concluded the arrangement of weld in high stress area which was one of the most important exterior factors that cause weld cracks.
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