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本文综合介绍了《大型球罐用CF钢的应用研究》课题协作组各有关成员单位,采用国产超低氢焊条新结607CF施焊国产CF-62钢及日本WEL-TEN62CF钢时所进行的各种焊接参数选择的试验研究结果,以及根据球罐的焊接特点采用已选择的较佳焊接工艺规范进行的焊接工艺评定及焊接接头韧性试验结果。结果表明,采用新结607CF焊条在室温下施焊CF钢,当焊接层间温度控制在200℃以下,焊接线能量在10～40kJ/cm范围内,焊后及焊后消除应力热处理状态下不同焊接位置(平焊、横焊、立焊)的工艺评定绪果均合格;焊接接头各部位的-40℃冲击功均大于等于2.8kgf·m(标准值)且富裕量较大;其余焊接接头韧性(COD、J积分、NDT温度、da/dN等)数值也均较理想。此外,本文还针对球罐组装焊接过程中碳弧气刨清根及焊缝返修工艺进行了较系统的试验。
In this paper, the relevant units and units of the Collaborative Group on the Application of CF Steel for Large Spherical Tanks were comprehensively introduced. When using the new ultra-low hydrogen welding rod made of China-made 607CF welding domestic CF-62 steel and Japan WEL-TEN62CF steel The results of the pilot study on the choice of welding parameters, as well as the welding procedure qualification and the results of the toughness test of the welded joint using the selected preferred welding procedure specification based on the welding characteristics of the spherical vessel. The results show that the welding temperature of welding layer is less than 200 ℃, the energy of welding line is 10 ~ 40kJ / cm, and the welding temperature is different after welding and after welding The welding conditions (welding, cross-welding and vertical welding) were all passed the qualification test. The impact energy at -40 ℃ of each part of the welded joint was greater than or equal to 2.8kgf · m (standard value) and the margin was large. The remaining welding joints Toughness (COD, J integral, NDT temperature, da / dN, etc.) values are also more ideal. In addition, this paper also conducted a more systematic test for the carbon arc gouging roots and weld rework process in the process of spherical tank assembly welding.