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Flux-cored wire for submerged arc welding, and material for submerged arc welding

A technology of submerged arc welding and welding wire, which is applied in welding/cutting medium/material, welding medium, welding equipment, etc. It can solve the problems of unclear low temperature toughness and difficulty in ensuring impact performance, and achieve excellent low temperature toughness, high strength, and excellent welding. operational effects

Inactive Publication Date: 2020-06-12
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In submerged arc welding with relatively high online energy, for example, it is difficult to ensure good impact performance in the extremely low temperature range of -90°C, and there is still a problem in improving low temperature toughness.
For example, in the technique described in Patent Document 1, only the toughness at about -18°C is evaluated, and the low-temperature toughness in the ultra-low temperature range as described above is unknown, and it is required to ensure sufficient improvement in toughness even in the ultra-low temperature range

Method used

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  • Flux-cored wire for submerged arc welding, and material for submerged arc welding
  • Flux-cored wire for submerged arc welding, and material for submerged arc welding
  • Flux-cored wire for submerged arc welding, and material for submerged arc welding

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Embodiment

[0069] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in more detail, this invention is not limited to this.

[0070] In Table 1 and Table 2 below, the chemical composition (% by mass) of the flux-cored wire used in this test is shown. Also, in the chemical component composition in the total mass of the welding wire, the balance is Fe and unavoidable impurities. In addition, "-" in each component amount of Mg, Cr, Mo, and Cu means that each component amount is an amount equal to or less than the impurity level. In addition, the respective component amounts of N and O are the contents in the steel sheath (in the total mass of the steel sheath).

[0071] In addition, in the following Table 3, the chemical component composition (mass %) of the sintered-type flux (combined sintered-type flux) used for this test is shown. In addition, the basicity (BA) of the sintered type flux is calculated by the following formula (1). H...

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Abstract

The purpose of the present invention is to provide a flux-cored wire for submerged arc welding, and a material for submerged arc welding, with which it is possible to obtain a welded metal having exceptional strength and extreme-low-temperature toughness by exceptional welding activity and to suppress the amount of diffusible hydrogen in the welded metal. The present invention pertains to a flux-cored wire for submerged arc welding in which the interior of a steel outer layer is filled with flux, the flux-cored wire containing prescribed quantities of each of C, Si, Mn, Ni, Ti, B, CaF<2>, andMg in relation to the total mass of the wire, and the amounts of each of N and O in the outer layer being restricted so as to be equal to or less than a prescribed value.

Description

technical field [0001] The invention relates to flux-cored welding wire for submerged arc welding and materials for submerged arc welding. Background technique [0002] In recent years, due to the depletion of existing oil and gas fields, oil and gas field exploration and production bases will be developed in extremely cold regions such as the Arctic Circle in the future. Ensuring safety against brittle fracture is considered to be particularly important in mining facilities in extremely cold regions. [0003] In order to improve the low-temperature toughness of the weld metal, for example, it is conceivable to reduce the amount of oxygen in the weld metal. Here, a solid wire is generally used in submerged arc welding, but there is a limitation in adjusting the welding wire and the flux for submerged arc welding to achieve low oxidation, and there is also a problem of deteriorating welding workability. [0004] On the other hand, flux-cored wires are also used in submerged...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K35/30B23K35/362C22C38/00C22C38/04
CPCB23K35/0266B23K35/3026B23K35/3066B23K35/3073B23K35/3605B23K35/362B23K35/368B23K35/406C22C38/04C22C38/08C22C38/00B23K35/3053
Inventor 永见正行笹仓秀司
Owner KOBE STEEL LTD
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