By analyzing the relation of microstructure,weld zone quality and tensile property,it is concluded that the welding techn-ological parameter of L245 steel is the main factor of the welding crack.

• 通过分析L245钢埋弧焊焊缝区质量、微观组织和拉伸性能关系表明,焊接工艺参数的合理制定是低合金钢L245焊管产生裂纹等缺陷的关键因素。