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Method for welding flux-filled wire for gas-shielded arc welding and steel for ultra-low temperature, and method for manufacturing welded joint

A technology of arc welding and gas shielding, which is applied in arc welding equipment, welding medium, manufacturing tools, etc. It can solve the problems of inability to obtain weld metal and arc instability, achieve excellent low temperature toughness, reduce welding material costs, and reduce oxygen content Effect

Active Publication Date: 2016-07-06
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason for this is that when only inert gas is used, the arc becomes unstable, and sound weld metal free from welding defects cannot be obtained.

Method used

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  • Method for welding flux-filled wire for gas-shielded arc welding and steel for ultra-low temperature, and method for manufacturing welded joint
  • Method for welding flux-filled wire for gas-shielded arc welding and steel for ultra-low temperature, and method for manufacturing welded joint
  • Method for welding flux-filled wire for gas-shielded arc welding and steel for ultra-low temperature, and method for manufacturing welded joint

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Embodiment

[0175] Next, the possibility and effects of the present invention will be described in more detail through examples.

[0176] While conveying the steel strip in the longitudinal direction, it is formed into an open pipe by forming rollers. During the forming process, flux is supplied from the opening of the open pipe, and the opposite edge surfaces of the opening are butt seam welded, thereby manufacturing The pipe without the slit-like gap was annealed during the wire drawing operation after pipe making, and a flux-filled wire with a final wire diameter of φ1.2 mm was trial-produced. After trial production, a lubricant was applied to the surface of the wire.

[0177] The steel sheath (iron ring) uses mild steel containing C: 0.003%, Si: 0.03%, Mn: 0.11%, P: 0.006%, S: 0.003%, Al: 0.003%, and the rest contains iron and impurities The steel sheath of steel or the steel sheath of Ni-containing steel shown in Table 1. Here, % all means mass % with respect to the total mass of t...

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Abstract

The present invention provides a flux-filled wire capable of obtaining a weld metal having excellent low-temperature toughness, having high welding efficiency, and capable of omitting or simplifying preheating for suppressing low-temperature cracking. The filler wire contains one or more of CaF2, BaF2, SrF2, MgF2, and LiF. When the total content of these is α, the above-mentioned α is expressed in mass % with respect to the total mass of the above-mentioned flux filler wire. Calculated as 2.0 to 7.0%; the filler metal wire contains one or more of Ti oxides, Si oxides, Mg oxides, Al oxides, Zr oxides, and Ca oxides. When their total When the content is β, the above-mentioned β is 0.2 to 0.9% by mass with respect to the total mass of the above-mentioned flux-filled wire; the ratio of the above-mentioned CaF2 content to the above-mentioned α is 0.90 or more, and the ratio of the above-mentioned α to the above-mentioned β is 3.0 Above and below 15.0.

Description

technical field [0001] The present invention relates to a filled flux wire used in gas-shielded arc welding of 5.5 to 9.5% Ni steel for extremely low temperature used in LNG tanks or chemical workshops, etc. Disclosed are a flux-filled wire for gas-shielded arc welding with improved welding efficiency and excellent low-temperature fracture resistance, a method of welding steel for ultra-low temperature using the wire, and a method of manufacturing a welded joint. [0002] This application claims priority based on PCT / JP2013 / 080284 filed with the World Intellectual Property Organization on November 8, 2013 and Japanese Patent Application No. 2014-220853 filed in Japan on October 29, 2014, the contents of which are incorporated herein. Background technique [0003] In recent years, due to the strengthening of carbon dioxide emission standards due to the problem of global warming, the demand for natural gas that emits less carbon dioxide than petroleum and coal has increased. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/368B23K35/30B23K35/38B23K9/16
CPCB23K9/16B23K35/3033B23K35/368B23K35/383B23K35/3601B23K35/3602B23K35/3605B23K35/3607B23K35/3608B23K35/361B23K35/0266C22C38/08C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54B23K35/3066B23K9/173B23K35/34B23K35/36
Inventor 猿渡周雄儿岛一浩中村修一熊谷达也
Owner NIPPON STEEL CORP
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