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Flux cored wire, welding method using flux cored wire, method for producing welded joint using flux cored wire, and welded joint

A technology of flux-cored welding wire and welding joints, which is applied in the field of flux-cored welding wires and welding joints of welding metals, and can solve the problems of low-temperature toughness and low-temperature cracking resistance without special research.

Active Publication Date: 2015-09-30
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, neither Patent Document 6 nor Patent Document 7 has specifically studied the strict low-temperature toughness required for welded parts of high-strength steels of 780 MPa or higher, and has not particularly studied low-temperature cracking resistance.

Method used

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  • Flux cored wire, welding method using flux cored wire, method for producing welded joint using flux cored wire, and welded joint
  • Flux cored wire, welding method using flux cored wire, method for producing welded joint using flux cored wire, and welded joint
  • Flux cored wire, welding method using flux cored wire, method for producing welded joint using flux cored wire, and welded joint

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Embodiment

[0146] Next, the practicability and effects of the present invention will be described in more detail with examples.

[0147] The steel strip is formed into an open tube by forming rolls while being conveyed in the longitudinal direction, flux is supplied into the open tube from the opening of the open tube in the middle of the forming, and then the facing edge surfaces of the formed opening are bonded. The open pipe is made into a seamless pipe by butt seam welding, the pipe is manufactured in this way to obtain a flux-cored wire, the obtained flux-cored wire is drawn, and the flux-cored wire is annealed in the middle of the wire-drawing operation, thereby trial-manufacturing the final wire diameter Flux-cored wire of φ1.2mm. After trial production, a lubricant was applied to the surface of the flux-cored wire. In addition, a flux-cored welding wire with a seam having a wire diameter of φ1.2 mm was trial-produced by drawing a part of the jointed pipe which was not seam-welde...

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Abstract

This flux cored wire contains CaF2 and the like with the total content α of CaF2 and the like being 3.3-6.0% by mass relative to the total mass of the flux cored wire; contains Ti oxide and the like with the total content β of Ti oxide and the like being 0.4-1.2% by mass relative to the total mass of the flux cored wire; and contains CaCO3 and the like with the total content of CaCO3 and the like being 0.1-0.5% by mass relative to the total mass of the flux cored wire. The content of iron powder in the flux is less than 10% by mass relative to the total mass of the flux cored wire.

Description

technical field [0001] The present invention relates to a flux-cored welding wire for welding high-strength steel having a tensile strength of 780 MPa or more, and particularly relates to a weld metal that does not require preheating work for preventing low-temperature cracking or can significantly reduce preheating work and can obtain excellent low-temperature toughness flux cored wire. In addition, the present invention relates to a welding method using the flux-cored wire, a method of manufacturing a welded joint using the flux-cored wire, and a welded joint. [0002] This application claims priority based on Japanese Patent Application No. 2013-017604 for which it applied in Japan on January 31, 2013, and uses the content here. Background technique [0003] In recent years, the demand for large-scale and high-rise building structures such as buildings and bridges has increased; along with this, the steel materials used have also become 780MPa grade (tensile strength 780...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K35/30
CPCB23K35/0244B23K35/3606B23K35/3053C22C38/04B23K35/3066B23K35/368C22C38/14C22C38/08B23K35/30B23K35/362B23K35/3605C22C38/12B23K35/3602B23K35/0266B23K35/0255B23K35/0261C22C38/002C22C38/004C22C38/005C22C38/02C22C38/06C22C38/16C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58B23K9/02B23K9/173B23K9/23
Inventor 中村修一户塚康仁児岛一浩志村龙一
Owner NIPPON STEEL CORP
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