Flux composition for electro-slag over-lay welding of a cylindrical vessel with a strip electrode

摘要

A flux composition suitable for electro-slag over-lay welding a stainless steel on a circumferential inner surface of a cylindrical vessel with a strip electrode under controlling a flow of molten slag and metal with an outer electro-magnetic field, which contains 50-60% by weight of CaF2, 10-20% by weight of SiO2, 5-25% by weight of CaO and 10-30% by weight of Al2O3 in a ratio of SiO2/CaF2 of at least 0.20 and a ratio of CaO/SiO2 of at least 0.50.