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Method for manufacturing flux-cored wire, flux-cored wire and method for manufacturing welded joint

A technology of flux-cored welding wire and manufacturing method, applied in welding medium, manufacturing tool, welding equipment, etc., can solve problems such as peeling of coating film

Active Publication Date: 2020-10-23
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, in the weld metal obtained by the techniques described in Patent Document 3 and Patent Document 4, peeling of the coating film is likely to occur, and the peeled part becomes the starting point of the corrosion form in an environment with a large amount of flying salt.

Method used

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  • Method for manufacturing flux-cored wire, flux-cored wire and method for manufacturing welded joint
  • Method for manufacturing flux-cored wire, flux-cored wire and method for manufacturing welded joint
  • Method for manufacturing flux-cored wire, flux-cored wire and method for manufacturing welded joint

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Embodiment

[0130] The effects of the present invention will be described in more detail below through examples.

[0131] SPCC specified in JIS G 3141:2011 "Cold-rolled steel sheets and steel bands" is used as a steel sheath, filled with flux, and then reduced in diameter (for softening and dehydrogenation of the sheath, intermediate annealing is performed once) , various seamless flux-cored wires were trial-produced. The various seamless flux-cored wires have the components shown in Table 1-1 to Table 1-3, the filling rate is 13.5%, and the wire diameter is 1.2 mm, there is no through-through gap on the steel skin, which is the seamless type. However, A23 is manufactured by riveting. It should be noted that the numerical values ​​in Tables 1-1 to 1-3 represent mass % with respect to the total mass of the flux-cored wire (total mass of the steel sheath and flux). In addition, the values ​​described in Table 1-1 to Table 1-3 are design values. In the manufacture of the flux-cored wire, ...

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Abstract

This method for manufacturing flux-cored wire involves a step for filling flux into the inside of a steel plate while forming the steel plate into a cylindrical shape, a step for joining the two endsof the steel plate to obtain a steel pipe, and a step for rolling and annealing the steel pipe to obtain a flux-cored wire, wherein the chemical composition of the flux-cored wire is within prescribedranges, and the Sn content, the Sb content, the W content and the Mo content satisfy the relation Sn+Sb > Mo+W. The flux-cored wire according to another embodiment is manufactured by the aforementioned flux-cored wire manufacturing method. The method for manufacturing a welding joint according to another embodiment involves a step for welding using the flux-cored wire manufactured with the aforementioned flux-cored wire manufacturing method.

Description

technical field [0001] The present invention relates to a method for manufacturing a flux-cored wire, a method for manufacturing a flux-cored wire, and a welded joint. Background technique [0002] Weathering steel exposed to atmospheric corrosive environments generally develops a protective rust layer on its surface through prolonged use. The rust layer isolates the corrosion-resistant steel material from corrosive substances from the outside, and the corrosion of the weather-resistant steel material after the rust layer is formed can be suppressed, and its weather resistance can be exhibited. Therefore, weather-resistant steel materials are used in structures such as bridges as steel materials that can be used in the state of bare materials without painting. [0003] However, in environments with a lot of flying salt, such as seaside areas and areas where deicing agents are scattered, it is difficult to form a protective rust layer on the surface of weather-resistant stee...

Claims

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Application Information

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IPC IPC(8): B23K35/40B23K35/368C22C38/00C22C38/04
CPCB23K35/40B23K35/368C22C38/00C22C38/04B23K35/0266B23K35/3606B23K35/3073C22C38/12C21D9/50B23K35/406B23K35/3053C22C38/58
Inventor 桥场裕治笹木圣人坂林直树鸟谷部正明
Owner NIPPON STEEL CORP
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