Flux-core welding wire for shipping and ocean engineering alloy steel matching welding and preparation method
A technology of flux-cored welding wire and welding wire, which is applied in welding equipment, welding medium, metal processing equipment, etc., and can solve problems such as accelerated weld seam corrosion
Inactive Publication Date: 2017-03-22
江苏立新焊接材料有限公司
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Problems solved by technology
[0003] However, there are many occasions where Ni-Cr alloy steel is used in ships and marine engineering, and its natural immersion potential in seawater is higher than that of B-grade hull steel of C-Mn alloy system. 2 Gas-shielded flux-cored wire is used for welding, and the weld metal potential is lower than that of Ni-Cr alloys. As a result, a corrosion galvanic couple in which the base metal is a large cathode and the weld is a small anode is formed in seawater, which will inevitably accelerate the corrosion of the weld.
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[0047] According to the chemical composition and production process requirements of the flux-cored wire core powder of the present invention, three batches of 10CrSiNiCu steel matching flux-cored wires were produced. The base metal and welding process parameters of the three batches of welding wire are shown in Table 2. After welding, the mechanical performance test and seawater natural immersion potential measurement were carried out on the obtained deposited metal. The test results are shown in Table 3.
[0048] Table 1 Example—10CrSiNiCu steel flux-cored wire steel strip composition and flux core composition (weight, %)
[0049]
[0050] Table 2 Example - 10CrSiNiCu steel flux cored wire welding base metal and welding process parameters
[0051]
[0052] Table 3 Example - 10CrSiNiCu steel flux cored wire deposited metal properties
[0053]
[0054] Note: Charpy impact energy is the average value of five samples.
[0055]
[0056] The flux-cored welding wire m...
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The invention provides a flux-core welding wire for shipping and ocean engineering alloy steel matching welding and a preparation method. A flux core of the welding wire comprises, by weight of the welding wire, 4.5-9.0% of sintering powder, 0.21-0.7% of Fe3O4, 0.15-1.0% of TiO2, 0.15-0.5% of Al, 0-0.4% of Ti, 0.1-0.5% of Si, 2.0-3.5% of Mn, 0-0.4% of Mo, 0.5-1.1% of Ni, 0.1-0.4% of Cr, 0-0.3% of Cu and 1.0-2.0% of Fe; and a combination of the chemical components of the flux core accounts for 13.0-15.5% of the welding wire by weight. The flux-core welding wire is prepared by processing flux-core powder materials prepared according to a formula provided by the invention and can be welded in the condition of CO2 gas protection, and the related technical demand of Ni-Cr alloy welding applied to the shipping and ocean engineering is met.
Description
technical field [0001] The present invention relates to a kind of welding material, especially relates to ship and ocean engineering alloy steel supporting CO 2 Gas shielded flux cored wire. Background technique [0002] In recent years, in the field of shipbuilding, the CO of C-Mn alloy system has been widely used 2 Gas-shielded flux-cored welding wire is used for automatic and semi-automatic welding, and its welding objects are mainly C-Mn alloy system B-grade hull steel. Although the natural immersion potential of the two in seawater is low, there is not much difference, and no galvanic couple will be formed. corrosion. [0003] However, there are many occasions where Ni-Cr alloy steel is used in ships and marine engineering, and its natural immersion potential in seawater is higher than that of B-grade hull steel of C-Mn alloy system. 2 Gas-shielded flux cored wire is used for welding, and the weld metal potential is lower than that of Ni-Cr alloy. As a result, a corr...
Claims
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IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3093B23K35/40
Inventor 桂赤斌
Owner 江苏立新焊接材料有限公司