Flusskjernewire for gassdekket buesveising

摘要

Flux cored wires provide high arc stability, good bead shape and high toughness in gas shielded arc welding using mixed gases containing argon and carbon dioxide. A flux cored wire for gas shielded arc welding with a mixed gas comprising argon and carbon dioxide which comprises: a seam-welded steel sheath; and a core filled in the steel sheath and comprising, all in weight percent: a slag and arc stabilizer comprising 4.0 to 6.0 % TiO2, 0.2 to 0.8 % SiO2, 0.4 to 0.8 % ZrO2, 0.2 to 0.8 % Al2O3, 0.06 to 0.25 % Na2O + K2O, and 0.1 to 0.4 % metal fluoride; an alloying agent and metal deoxidizer comprising 0.03 to 0.06 % C, 0.20 to 0.80 % Si, 1.50 to 2.20 % Mn, and 0.30 to 0.60 % Mg; and not less than 2 % Fe; in which the percentages of iron and a combination of Na and K segregated in the quartered cross section of the wire that are defined by the following equations (1) and (2) are not more than 10 % and not more than 0.15 %, respectively: $wherein\; Max.\; AFe\; =\; maximum\; area\; ratio\; of\; Fe\; segregated\; in\; the\; quartered\; cross\; section\; of\; the\; wire;\; Min.\; AFe\; =\; minimum\; area\; ratio\; of\; Fe\; segregated\; in\; the\; quartered\; cross\; section\; of\; the\; wire;$ wherein\; Max.\; A(Na+K)\; =\; maximum\; area\; ratio\; of\; a\; combination\; of\; Na\; and\; K\; segregated\; in\; the\; quartered\; cross\; section\; of\; the\; wire;\; Min.\; A(Na+K)\; =\; minimum\; area\; ratio\; of\; a\; combination\; of\; Na\; and\; K\; segregated\; in\; the\; quartered\; cross\; section\; of\; the\; wire.\mathop{\mathrm{image}}$$