Multilayer heaping and combined wire null for electro- gas arc welding of X beveling coupling welding

摘要

PURPOSE:To furnish a flux-cored wire for electrogas arc welding where low temperature toughness of weld metal or a heat-affected zone is improved and fluidity of slag is improve according. CONSTITUTION:This flux-cored wire for electrogas arc welding constitutes a characteristic feature that a slag forming agent consists of a metallic fluoride and a metallic oxide, flux in which the metallic fluoride/the metallic oxide is equal to 0.3-0.8 is filled in the steel sheath, 0.7-1.5% slag forming agent, 0.7-1.5% Mn, 0.15-0.5% Si, 0.1-0.6% Mg, 0.05-0.25% Ti, 1.5-4.5% Ni, 0.002-0.02% B, 10-25% iron powder and as necessary, 0.005-0.25% Al are contained in the flux for the total weight of the flux-cored wire and the total sum of C in the steel sheath + the flux is made to 0.02-0.06%.