PURPOSE:To obtain at a high speed a spiral bead which is excellent in peeling property of a slag and has an excellent shape, by controlling the composition and the softening temperature of a flux and the position of a specified section solidification rate of a bead. CONSTITUTION:A spiral pipe is welded by use of a flux which contains by wt% 35-46% SiO2 14-25% TiO2, 10-20% MnO, 1-10% Al2O3, 2-10% MgO, 10- 20% CaO and 2-8% CaF2, and the balance impurities, satisfies SiO2/TiO2= 1.5-2.9, and is =130 deg.C softening temperature. In this case, a position of 40-70% sectin solidification rate of a bead showing a ratio of a solidified area in a section of the inside face or outside face molten pool to the inside face or outside face final bead sectional area is controlled as mentioned below. That is to say, a welding point is selected so that it comes to the lowest part of the pipe and the top of the pipe in case of the insde face welding and the outside face welding, respectively.
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机译：目的：通过控制焊剂的组成和软化温度以及规定的截面凝固速度的位置，以高速获得具有优异的炉渣剥离性能并具有优异形状的螺旋珠。组成：螺旋管是通过使用焊剂进行焊接的，焊剂中含有35％至46％的SiO2（重量百分比）14-25％的TiO2、10-20％的MnO，1-10％的Al2O3、2-10％的MgO，10-20％ CaO和2-8％的CaF 2以及其余的杂质满足SiO 2 / TiO 2 ＝ 1.5-2.9，并且≥130℃的软化温度。在这种情况下，控制珠的sectin固化率在40-70％的位置，以显示内表面或外表面熔池的截面中的固化面积与内表面或外表面最终珠的截面积之比。如以下所说的。也就是说，选择焊接点，以便在进行内表面焊接和外表面焊接的情况下分别到达管道的最低部分和管道的顶部。
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