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结合现场施工情况，对两台5万m3储罐埋弧自动焊横缝裂纹产生的机理和原因进行分析，探讨了控制和预防措施，认为控制钢材和焊材的S、P含量，减小壁板组对时拘束度以及进行焊前预热是有效措施。
Combining with the construction situation in the field, the mechanism and cause of transverse cracks in two submarine arc welding submerged arc welding arcs of two 50000 m3 storage tanks are analyzed. The control and precautionary measures are discussed. It is considered that controlling S and P contents of steel and welding consumables, Board constraints on the time and preheating before welding is an effective measure.