| 摘要 |
PURPOSE:To obtain a titled welding rod which is capable of obtaining a weld metal which is excellent in a crack opening displacement (COD) characteristic and low temperature toughness, by covering a soft steel core wire with a coating flux which contains Ti and B of a proper quantity, and also has added carbonate, fluoride, Si, Mn, Al, etc. CONSTITUTION:A covered arc welding rod generating low hydrogen atmosphere is obtained by covering a soft steel core wire with a coating flux constituted by mixing 25-55% one kind or more of CaCO3, MgCO3 and BaCO3, 2-10% titanium oxide (expressed in terms of TiO2), 1-25% one kind or more of CaF2, Na3AlF6, MgF2 and AlF3, 1-8% Si, 0.1-0.6% one kind or more of an alloy of B or a carbide of B (expressed in terms of B) of Ti, Al, Zr, Cr, Mo, Mn and Ni, also in total 2-6% an alloy of B and Mn except Mn-B alloys in total 0.5-3.0% an alloy of B and Ti except Ti-B of alloys, and in total 0.1-4.0% one kind or more or Al, Mg, Ca and Zr (as for Al and Zr, that which is added as an alloy with B is contained), and also a slag agent, an arc stabilizer and a tackifier, other than above described components, as other contents. |
