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灰口铸铁由于基本无塑性，强度也很低，在拘束状态下焊接时极易出现裂纹．要防止产生裂纹，就要从仔细分析焊接时拘束应力产生的条件出发，达到防止产生裂纹的目的．正确设计焊接顺序和加热减应法，在拘束条件下焊接铸铁零件是有效和必要的．
Due to the basic plasticity of gray cast iron, the strength is also very low, and it is very easy to crack when welding in the restrained state. To prevent cracks, it is necessary to carefully analyze the conditions of the restraint stress generated welding to achieve the purpose of preventing cracks. It is effective and necessary to weld the cast iron parts under restraint conditions by properly designing the welding sequence and heating and reducing method.