| 摘要 |
PURPOSE:To economize welding material and to reduce welding time in narrow- gap welding of extra-thick steel and welding of thin sheets by limiting respectively the components of the slag forming agent and gas generating agent of a flux consisting of a mixture composed of the slag forming agent, gas generating agent and metallic powder and satisfying the conditions of the specific equations. CONSTITUTION:This flux contains, by weight, 10-24% SiO2, 13.5-30% Al2O3, 3-10% metallic fluoride, with respect to CaO and MgO, >=18.5wt% CaO and 18.5wt% MgO including the amt. corresponding to the values in terms of the respective oxides of CaCO3 and MgCO3 occupying in the gas generating agent as the slag forming agent components and satisfies the conditions expressed by equation I. The metallic carbonate as the gas generating agent component is incorporated therein at 3.5-12wt% in terms of CO2 and <=15wt% metallic powder is incorporated therein. A weld metal having high toughness is obtd. by using such flux.
|
