Low alloy steel flux-cored welding wire for carbon dioxide gas protection welding
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A technology of gas shielded welding and low-alloy steel, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems that are not suitable for all-position welding of low-alloy high-strength steel, cannot guarantee low-temperature impact toughness, and achieve good arc stability and welding operation performance, maintaining the arc stability and welding operation performance, and the effect of smoothing the weld seam
Inactive Publication Date: 2009-07-22
WUHAN TEMO WELDING CONSUMABLES CO LTD
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The above-mentioned flux-cored wire is obviously not suitable for all-position welding of low-alloy high-strength steel, and cannot guarantee low-temperature impact toughness below -40°C
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[0031] The present invention will be described in further detail below in conjunction with accompanying drawing description and specific embodiment:
[0032] The steel sheath of the flux-cored wire is made of low-carbon steel, and its chemical composition is shown in Table 1.
[0033] Table 1: Chemical Composition % of Flux Cored Wire Steel Sheath
[0034] C
[0035] The sum of the contents of other components S, P, Sn and Bi in the flux core and carbon steel sheath of the present invention should be less than 0.035 in % of the total weight of the welding wire, wherein S is less than 0.015, P is less than 0.020, Sn is less than 0.001, and Bi is less than 0.001.
[0036] The chemical composition and raw material composition of the drug core powder are shown in Table 2.
[0037] Table 2: Composition of drug core powder
[0038] Core composition
[0039] The outer skin (14 mm wide and 0.9 mm thick) made of low carbon steel strip is filled with core powder, t...
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Abstract
A low-alloy steel flux-cored welding wire for carbon dioxide gas shielded welding, the composition and content of the flux core in % of the total weight of the welding wire are as follows: TiO2: 3-6, Si: 0.3-0.5, Mn: 1.5-3.2, SiO2: 0.1 -0.8, ZrO2: 0.1-0.5, Fe: 2-7, Al+Mg: 0.5-1.2, Ni: 0.5-5, B: 0.002-0.015, Ti: 0.1-0.3, oxidation of alkali metal K, Na, Li The content of fluoride or fluoride equivalent to K, Na, and Li is 0.1-0.35, the content of fluoride F is 0.05-0.2, the fluoride or oxide of rare earth metal is equivalent to 0.005-0.2 of rare earth metal, and the content of C, Si, and Mn in the welding wire The product of the contents is 0.058-0.11. For high-strength low-alloy steel all-position welding process performance is good, it can maintain good arc stability and welding operation performance under the condition of high current and fast welding, the weld seam is smooth, the connection strength is high and it has a good -40 ℃ low temperature Impact toughness and excellent crack resistance.
Description
Technical field [0001] The invention relates to a welding material for metal welding, in particular to a low-alloy steel flux-cored welding wire for carbon dioxide gas shielded welding. Background technique [0002] Carbon dioxide gas-shielded flux-cored welding is compatible with the advantages of welding rods and gas-shielded solid wire welding, with high production efficiency and good welding process performance. Therefore, this welding method has been widely used in the processing and manufacturing of steel structures such as ships and bridges. Because of this, the functional requirements for flux-cored welding wire are getting higher and higher. It is required that the flux-cored welding wire can not only adapt to faster welding speed, but also have good arc stability and welding operation performance; Chinese patent announcement number: CN 1775452C, date of announcement: May 24, 2006, the name of the invention is "Carbon Steel Flux-Cored Wire for Gas Shielded Welding"...
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