Metal type flux cored wire and gas shield arc welding process null for galvanized steel sheet

摘要

PURPOSE: To provide the gas shield arc welding method to reduce defect of pit, blow hole, etc., due to zinc vapor for a steel sheet having wide difference in kind and deposit quantity of galvanization. ;CONSTITUTION: A zinc or zinc alloy galvanized steel sheet is subjected to gas arc welding using pure Ar or the gas in which ≤30vol% CO₂ is mixed to Ar. Further, the metal flux cored wire having a composition consisting of, by weight for the whole wire, 0.05-0.10% C, 0.10-0.60% Si, 0.20-1.00% Mn, 0.20-0.90% total of one kind or more out of Nb, V, in which SiO₂ or a silicate acid compound satisfies ≤0.30% in term of SiO₂, in which an oxygen content 0wt.% for plating deposit quantity Xg/m² satisfies 0.43.logX-0.2≤0≤0.43.logX, is used.;COPYRIGHT: (C)1996,JPO