Flux for electroslag overlay welding

An electroslag surfacing and flux technology, applied in arc welding equipment, welding medium, welding equipment, etc., can solve the problems of reduced welding slag peelability, high viscosity of molten welding slag, and thermal adhesion of welding slag, and achieve excellent welding. stability, good bead appearance, good bead shape

Active Publication Date: 2013-03-27
KOBE STEEL LTD
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Problems solved by technology

In addition, the molten flux of Patent Document 3 does not have sufficient conductivity to molten slag, and similar to Patent Document 2, it cannot obtain a sufficient calorific value when the amount of heat input is small, and the generated heat is affected by the melting of the flux. Take away, so there is also the problem that stable welding cannot be implemented especially in the low current area
In addition, the molten flux of Patent Document 3 cannot obtain sufficient viscosity, so that a good weld bead appearance cannot be obtained. On the other hand, the viscosity of the molten slag is too high, and the slag detachability is reduced, so it is easy to generate slag heat. Adhesion and other poor condition problems

Method used

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  • Flux for electroslag overlay welding
  • Flux for electroslag overlay welding
  • Flux for electroslag overlay welding

Examples

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Embodiment

[0057] Next, examples showing the effects of the flux for electroslag overlay welding of the present invention will be specifically described in comparison with comparative examples.

[0058] First, a molten flux material is put into an electric furnace at a predetermined ratio, heated and melted by the electric furnace, and then cooled to obtain a solid molten flux material. The composition of each molten flux material is shown in Table 1-1 and Table 1-2. This molten flux material was pulverized, sized, and mixed as a part of raw materials for sintered flux to obtain a flux for electroslag overlay welding having the composition shown in Table 2-1 and Table 2-2. The addition amount of molten flux in the flux for electroslag overlay welding is collectively shown in Table 1-1 and Table 1-2. In addition, in Table 1-1 and Table 1-2, the column of the addition amount of molten flux is left blank for the case where the molten flux material cannot be obtained. In addition, in Table...

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Abstract

The invention provides a flux for electroslag overlay welding. The flux is advantageous in that, in electroslag overlay welding for which band steel formed by a Ni-based alloy is used, even under the condition of small heat input amount in welding, stability of welding is excellent, and good welding bead shape and welding bead appearance can be obtained. The flux (1) is used for the electroslag overlay welding for which the band steel formed by the Ni-based alloy is used. The flux (1) is a sintered flux obtained by mixing and sintering, in total mass percent of the flux, 3-10 mass% of a molten flux as a part of raw materials for the sintered flux, wherein the molten flux comprises CaF2: 5-20 mass%, Al2O3: 10-20 mass%, SiO2: 40-60 mass%, and CaO: 15-30 mass%. In addition, whole composition of the flux is optimized.

Description

technical field [0001] The present invention relates to a flux for electroslag overlay welding used when using a strip electrode to perform overlay welding on parts requiring corrosion resistance of structures such as pressure vessels for atomic energy and chemical reaction vessels, and particularly relates to fluxes made of Ni-based alloys. The electroslag surfacing flux used in the surfacing welding of strip electrodes. Background technique [0002] Conventionally, in structures of nuclear energy pressure vessels and chemical reaction vessels, a welding method has been used for inner surfaces requiring corrosion resistance, that is, a welding method in which a strip-shaped electrode (hereinafter referred to as strip steel) and the surface of the structure ( In the state where the space between (hereinafter referred to as the base metal) is filled with flux, a current flows between the strip steel and the base metal, and the strip steel and the base metal are melted by the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362
CPCB23K9/04B23K35/3607B23K35/361B23K35/362
Inventor 泽田有志渡边博久川本裕晃
Owner KOBE STEEL LTD
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