Study on the Flux for Long Electrode Distance Submarged Arc Welding Method

Abstract

In order to apply an one-side welding process to the lower temperature service steel plate, the reduction of welding heat input, the reorganization of heat cycles, etc., are requested.
From this point of view, Longer Electrode Distance Submerged Arc Process has been proposed, and new type flux which makes possible to weld with such longer electrode distance, was researched.
With common flux, the solidified slag formed by a leading electrode has larger electric resistance and thus the arc restriking by a trailing electrode is difficult. In order to get better arc restrikability, it is necessary to make electric conductance of solidified slag more than 0.01 mho/cm at the point of a trailing electrode wire tip.
Higher electric conductance and better arc restrikability of the slag can be got with the flux of high TiO₂ content, and TiO₂-CaF₂-Al₂O₃ system flux is the most suitable to the Longer Electrode Distance Submerged Arc Process.