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Fluoride-based FCW is different from rutile-based FCW in that it can easily reduce the oxygen content of the weld metal, but it has the following problems: the welding position is limited to the downward and horizontal fillet welds, and welding in the vertical, upward, and lateral directions is extremely difficult. difficulty
In fact, no flux-cored wire satisfying these characteristics has been put into practical use so far.
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[0105] Next, the present invention and comparative examples are examined with reference to examples.
[0106] First, the manufacturing process of the trial welding wire will be described. The steel sheath whose composition is shown in Table 1 is as figure 1 The shape shown is U-shaped and at this stage the flux is filled from above into the steel skin. Afterwards, it is shaped into an O-shaped welding wire with a slit and processed into a trial-manufactured welding wire with a diameter of φ1.2mm through a wire drawing process. In addition, welding wires without slits are filled with flux and then welded to the joined portion of the steel sheath. After eliminating the slit-like gaps in the steel sheath that cause the flux to absorb moisture, wire drawing is performed and processed into diameters. φ1.2mm prototype welding wire. In the examples of the present invention, all the components of the welding wire were adjusted by the flux filled inside the steel sheath.
[0107] [...
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Abstract
Provided is a wire containing flux for gas-sealed welding. Said wire can reduce the oxygen content of the welded metal, resulting in a high-toughness welded joint, and also allows DC reverse-polarity all-position welding. The wire contains, by mass: between 0.2% and 7.0% CaO; a total of at least 1.0% of at least one fluoride selected from among MgF2, CaF2, SrF2, and BaF2 (the sum of the amount of said fluoride(s) and the amount of CaO being between 3.0% and 12.0%); a total of between 0.2% and 2.0% of at least one element selected from among silicon, aluminum (less than 0.3%), titanium, magnesium, zirconium, calcium, cerium, and lanthanum; and a total of between 0.2% and 3.0% of at least one oxide selected from among oxides of silicon, manganese, aluminum, titanium, boron, and zirconium. Also, alpha = C + Si / 30 + Mn / 20 + Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + Nb / 10 + 5B is between 0.15% and 0.40%, the sum of the phosphorus content and the sulfur content is at most 0.040%, and the remainder comprises iron, an arc stabilizer, and unavoidable impurities. The iron powder content of the flux is at most 5.0%.
Description
technical field [0001] The present invention relates to gas-shielded arc welding flux-cored welding wire capable of all-position welding, in particular, relates to a weld metal capable of reducing the oxygen content of the weld metal to below 300 mass ppm, thereby obtaining a weld metal with excellent toughness, and capable of reverse polarity with DC The polarity of the wire as the positive electrode) is used for gas shielded arc welding with a flux-cored wire. Background technique [0002] Gas-shielded welding flux-cored welding wire is widely used in the industry as a welding material capable of realizing an efficient welding method, and most of them are flux-cored welding wires in which Ti oxide represented by rutile is the main slag-forming material (hereinafter, sometimes referred to as Rutile FCW). [0003] Rutile-based FCW has excellent welding workability, and is characterized by being able to weld easily in various welding positions such as downward, vertical, upw...
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