| 摘要 |
PURPOSE:To improve the resistance to breakage of flux cup in the stage of contact reignition and to improve welding quality and working efficiency by specifying the component contents of CaCO3, TiO2, SiO2, Fe-Mn, org. material and ultrafine granular iron powder in the compsn. of a coating material. CONSTITUTION:A coating material which consists principally of 10-30% CaCO3, 15-30% TiO2 (TiO2 consists of 1-5% titanium oxide and the balance a rutile- component), 15-30% SiO2, 4-13% Fe-Mn, 2-5% org. material and 20-40% ultrafine granular iron powder having >=80% <=325 mesh and is adequately compounded with a slag forming agent, deoxidizing agent and binder is prepd. Such coating material is coated on a steel core wire to form a coated electrode. Since fine granular iron powder is used for the coating material of such electrode, a reignition property is assured with a small amt. of said powder to be added. Resistance to breakage flux cup is satisfactory in this case. |
