Research on HT250 gray iron flame welding with multi-alloying cast iron torch welding rods.Hardness, crack resistance and machinability of the welded joint is tested and analyzed.

• 采用多元微合金化铸铁同质气焊丝对HT250铸铁板材进行了气焊研究,测试和分析了焊接接头的硬度、抗裂性和机械加工性能。