经过数十年特别是近十年来的研究和生产实践,国内在铸铁电焊条的研制、生产和运用技术上,已经积累了比较丰富的经验,焊条质量达到了相当稳定的程度。但是在钢芯球墨铸铁焊条的研制方面进展 After decades of research and production practice, especially in the last decade, the domestic experience in the development, production and application of cast iron welding electrodes has accumulated a wealth of experience and the quality of welding electrodes has reached a fairly stable level. However, the development of steel core ductile iron electrode development