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Flux for Submerged Arc Welding

A submerged arc welding and flux technology, applied in arc welding equipment, welding equipment, welding medium, etc., can solve the problems of damaged slag protection, deterioration of welding metal toughness, deterioration of welding operability, etc., and achieve good welding operability. , the effect of reducing moisture absorption

Active Publication Date: 2019-08-09
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the technology described in Patent Document 4, the specific surface area is attempted to be reduced, but the specific surface area of ​​the flux has a significant influence on the protective properties of the slag during welding.
Specifically, if the specific surface area of ​​the flux is reduced, the protective properties of the slag will be impaired, the nitrogen content in the weld metal will increase, and the toughness of the weld metal will deteriorate.
[0014] On the other hand, the technology described in Patent Document 5 regarding high-temperature sintered flux, in which the flux components are designed for the main purpose of dealing with AC welding power sources, is most likely to occur when using DC welding power sources. Sexual deterioration not considered
That is, with the flux described in Patent Document 5, if the welding power source is a direct-current type, the same effect as when an alternating-current type is used cannot be obtained.

Method used

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  • Flux for Submerged Arc Welding
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  • Flux for Submerged Arc Welding

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Embodiment Construction

[0026] Hereinafter, modes for implementing the present invention will be described in detail. In addition, this invention is not limited to embodiment described below.

[0027] The inventors of the present invention conducted earnest experimental studies to solve the aforementioned problems, and as a result obtained the following conclusions. When using a DC welding power source, in order to protect the slag stripping performance, the SiO content of the flux should be reduced as much as possible. 2 quantity. In addition, regarding MgO, if the addition amount is not increased compared with the flux described in Patent Document 5, the slag detachability cannot be improved.

[0028] Therefore, in the flux for submerged arc welding (hereinafter, simply referred to as flux.) according to the embodiment of the present invention, SiO 2 The content of MgO is 10-20% by mass, the content of MgO is 25-35% by mass, and the water-soluble SiO 2 It is 1.0 mass % or less. In addition, in...

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Abstract

To provide a flux for submerged arc welding that has good welding operability regardless of whether the welding power source is an AC type or a DC type, and that can reduce the amount of moisture absorbed by the flux and the amount of diffusible hydrogen in the weld metal. The flux for submerged arc welding is made into the following composition, containing MgO: 25 to 35% by mass, CaF of F 2 Conversion value: 15 to 35% by mass, Al 2 o 3 : 10-25% by mass, SiO 2 : 10-20% by mass, Na of Na 2 O conversion value, K of K 2 O conversion value and Li of Li 2 The sum of at least one or more of O conversion values: 0.5 to 6.5% by mass, FeO conversion value of Fe: 0.5 to 5% by mass, TiO 2 : 1 to 5 mass%, CaO: 6 mass% or less (including 0 mass%), MnO conversion value of Mn: less than 2.0 mass% (including 0 mass%), water-soluble SiO 2 : 1.0% by mass or less (including 0% by mass), water-soluble Na 2 O: 1.0% by mass or less (including 0% by mass), water-soluble K 2 O: 0.8 mass % or less (including 0 mass %), C content is 0.2 mass % or less (including 0 mass %), assuming that the MgO content is [MgO], the Al 2 o 3 The content is [Al 2 o 3 ], the F to CaF 2 The content in conversion value is [CaF 2 ], the TiO 2 The content is [TiO 2 ], satisfy the following mathematical expression (I).

Description

technical field [0001] The present invention relates to a flux for submerged arc welding. Background technique [0002] Flux used for submerged arc welding can be broadly classified into melting type flux and firing type according to its form. Melting flux is produced by melting various raw materials in an electric furnace and crushing them. On the other hand, firing-type flux is produced by combining various raw materials with a binder such as alkali silicate, granulating them, and firing them. [0003] In addition, sintered flux is classified according to the firing temperature. Generally, those fired at 400°C or higher and lower than 600°C are called low-temperature sintered fluxes, and those fired at 600-1200°C are called high-temperature sintered fluxes. Furthermore, in low-temperature firing-type fluxes, various studies have been made in order to reduce the diffusion of hydrogen into the weld metal (see Patent Documents 1 to 3). For example, Patent Documents 1 to 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362B23K35/30C22C38/00C22C38/04
CPCB23K35/30B23K35/362C22C38/00C22C38/04B23K9/18B23K35/3601
Inventor 加纳觉幸村正晴小林奈绪子
Owner KOBE STEEL LTD
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