| 摘要 |
PURPOSE:To improve all attitudes weldability and low-temp. toughness by composing a cored wire of the compsn. packed with prescribed % of a granular flux consisting of specific weight % each of BaF2, LiF, Al, Mg, etc. into a metallic sheath. CONSTITUTION:The granular flux component consisting essentially of 25-75% BaF2, 1-15% LiF, 0.2-3.5% SiO2, 0.4-5.0% CaO, 4-28% iron oxide 4-15% Al, 3-12% Mg and 2-9% Mn is packed at 13-30% into the metallic sheath consisting of mild steel, etc. to constitute the cored wire. BaF2 contributes to an improvement in a droplet transfer characteristic and LiF contributes to stabilization of an arc and an improvement of low-temp. toughness. SiO2 improves slag removability, Al improves blowhole resistance and Mn improves strength. The weldability in all attitudes and low-temp. toughness are improved by the above-mentioned method.
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