The paper briefly analyses the main cause of crack of welding seam on an evaporation tank and proposes the precautionary measures for preventing such kind of accident on pressure vessels.

简要分析了一台蒸发罐发生焊缝开裂的主要原因，提出防止此类压力容器事故的预防措施。

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According to the problem that the welding seam of the main winch drum structure is easy to crack, this article analyzes the cause and puts forward efficient measures of reducing it's ouurrence.

根据主井绞车滚筒结构的开焊情况，分析了开焊的因素，提出了减少开焊的措施。

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At last, the fatigue crack in the experiment and the main influential factor of fatigue strength of fillet welding seam was studied.

最后，对疲劳试验中有关裂纹以及影响焊缝疲劳强度的主要原因进行了探讨。

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