B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/41
B23K 9/18 (2006.01) B23K 35/30 (2006.01) B23K 35/362 (2006.01)
Patent
CA 1148620
Abstract of the Disclosure A process for both-side single layer, high speed submerged arc welding of steel plate for use in low-temperature applications having a particular chemical composition with a welding flux and welding wire is disclosed. The welding flux comprises 20 to 30 wt% of SiO2, less than 25 wt% of at least one of TiO2 and ZrO2, 10 to 20 wt% of CaO, less than 10 wt% of at least one of MnO and MgO, not more than 10 wt% of A?2O3 and 20 to 40 wt% in total of CaF2 and BaO each being not more than 20 wt%, wherein a total content of acidic components (SiO2% + TiO2% + ZrO2%) is 30 to 45 wt%, a total content of basic components (CaO % + MgO% + MnO%) is 20 to 30 wt% and a weight ratio of the total content of basic components to the total content of acidic componen-ts is within a range of 0.5 to 0.8; said these components being compounded so that a surface tension F of slag is not more than 450 dyne/cm as calculated from the following equation (1): F = 285 x [SiO2] + 380 x [TiO2] + 470 x [ZrO2] + 640 x [A?2O3] + 653 x [MnO] + 512 x [MgO] + 602 x [CaO] + 400 x [CaF2] + 366 x [BaO] ..... (1) wherein a parenthesis represents a mol fraction of each component. The welding wire is composed of a steel wire containing up to 0.10 wt% of carbon, up to 0.4 wt% of silicon, 1.0 to 2.5 wt% of manganese, 0.015 to 0.05 wt% of aluminum, not more than 0.008 wt% of nitrogen, 0.10 to 0.18 wt% of titanium and 0.01 to 0.02 wt% of boron. The welding flux and welding wire are used in combination with each other so that a carbon equivalent CE of the resulting weld metal is 0.35 to 0.43% as calculated from the following equation (2): CE(%) = C(%) + 1/24Si(%) + 1/6Mn(%)+1/4Mo(%) + 1/5Cr(%) + 1/40Ni(%) + 1/14V(%) ..... (2) to thereby obtain a weld metal containing not more than 0.008 wt% of nitrogen, 0.025 to 0.035 wt% of oxygen, 0.0015 to 0.0030 wt% of boron, 0.015 to 0.030 wt% of titanium and 0.010 to 0.030 wt% of aluminum and having a high low-temperature toughness without weld defects.
372592
Kawasaki Steel Corporation
Smart & Biggar
LandOfFree
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